- * IMPLEMENTATION NOTE - This implementation is heavily - * based on the SAXParserFactory and DocumentBuilderFactory implementations - * (corresponding to the JAXP pluggability APIs) found in Apache Xerces. - */ -public abstract class LogFactory { - // Implementation note re AccessController usage - // - // It is important to keep code invoked via an AccessController to small - // auditable blocks. Such code must carefully evaluate all user input - // (parameters, system properties, config file contents, etc). As an - // example, a Log implementation should not write to its logfile - // with an AccessController anywhere in the call stack, otherwise an - // insecure application could configure the log implementation to write - // to a protected file using the privileges granted to JCL rather than - // to the calling application. - // - // Under no circumstance should a non-private method return data that is - // retrieved via an AccessController. That would allow an insecure app - // to invoke that method and obtain data that it is not permitted to have. - // - // Invoking user-supplied code with an AccessController set is not a major - // issue (eg invoking the constructor of the class specified by - // HASHTABLE_IMPLEMENTATION_PROPERTY). That class will be in a different - // trust domain, and therefore must have permissions to do whatever it - // is trying to do regardless of the permissions granted to JCL. There is - // a slight issue in that untrusted code may point that environment var - // to another trusted library, in which case the code runs if both that - // lib and JCL have the necessary permissions even when the untrusted - // caller does not. That's a pretty hard route to exploit though. - - // ----------------------------------------------------- Manifest Constants - - /** - * The name ({@code priority}) of the key in the config file used to - * specify the priority of that particular config file. The associated value - * is a floating-point number; higher values take priority over lower values. - */ - public static final String PRIORITY_KEY = "priority"; - - /** - * The name ({@code use_tccl}) of the key in the config file used - * to specify whether logging classes should be loaded via the thread - * context class loader (TCCL), or not. By default, the TCCL is used. - */ - public static final String TCCL_KEY = "use_tccl"; - - /** - * The name ({@code org.apache.commons.logging.LogFactory}) of the property - * used to identify the LogFactory implementation - * class name. This can be used as a system property, or as an entry in a - * configuration properties file. - */ - public static final String FACTORY_PROPERTY = "org.apache.commons.logging.LogFactory"; - - /** - * The fully qualified class name of the fallback {@code LogFactory} - * implementation class to use, if no other can be found. - */ - public static final String FACTORY_DEFAULT = "org.apache.commons.logging.impl.LogFactoryImpl"; - - /** - * The name ({@code commons-logging.properties}) of the properties file to search for. - */ - public static final String FACTORY_PROPERTIES = "commons-logging.properties"; - - /** - * JDK1.3+ - * 'Service Provider' specification. - */ - protected static final String SERVICE_ID = - "META-INF/services/org.apache.commons.logging.LogFactory"; - - /** - * The name ({@code org.apache.commons.logging.diagnostics.dest}) - * of the property used to enable internal commons-logging - * diagnostic output, in order to get information on what logging - * implementations are being discovered, what classloaders they - * are loaded through, etc. - *
- * If a system property of this name is set then the value is - * assumed to be the name of a file. The special strings - * STDOUT or STDERR (case-sensitive) indicate output to - * System.out and System.err respectively. - *
- * Diagnostic logging should be used only to debug problematic - * configurations and should not be set in normal production use. - */ - public static final String DIAGNOSTICS_DEST_PROPERTY = - "org.apache.commons.logging.diagnostics.dest"; - - /** - * When null (the usual case), no diagnostic output will be - * generated by LogFactory or LogFactoryImpl. When non-null, - * interesting events will be written to the specified object. - */ - private static final PrintStream DIAGNOSTICS_STREAM; - - /** - * A string that gets prefixed to every message output by the - * logDiagnostic method, so that users can clearly see which - * LogFactory class is generating the output. - */ - private static final String diagnosticPrefix; - - /** - * Setting this system property - * ({@code org.apache.commons.logging.LogFactory.HashtableImpl}) - * value allows the {@code Hashtable} used to store - * classloaders to be substituted by an alternative implementation. - *
- * Note: {@code LogFactory} will print: - *
- * [ERROR] LogFactory: Load of custom hashtable failed - *- * to system error and then continue using a standard Hashtable. - *
- * Usage: Set this property when Java is invoked - * and {@code LogFactory} will attempt to load a new instance - * of the given implementation class. - * For example, running the following ant scriplet: - *
- * <java classname="${test.runner}" fork="yes" failonerror="${test.failonerror}">
- * ...
- * <sysproperty
- * key="org.apache.commons.logging.LogFactory.HashtableImpl"
- * value="org.apache.commons.logging.AltHashtable"/>
- * </java>
- *
- * will mean that {@code LogFactory} will load an instance of
- * {@code org.apache.commons.logging.AltHashtable}.
- *
- * A typical use case is to allow a custom
- * Hashtable implementation using weak references to be substituted.
- * This will allow classloaders to be garbage collected without
- * the need to release them (on 1.3+ JVMs only, of course ;).
- */
- public static final String HASHTABLE_IMPLEMENTATION_PROPERTY =
- "org.apache.commons.logging.LogFactory.HashtableImpl";
-
- /** Name used to load the weak hashtable implementation by names. */
- private static final String WEAK_HASHTABLE_CLASSNAME =
- "org.apache.commons.logging.impl.WeakHashtable";
-
- /**
- * A reference to the classloader that loaded this class. This is the
- * same as LogFactory.class.getClassLoader(). However computing this
- * value isn't quite as simple as that, as we potentially need to use
- * AccessControllers etc. It's more efficient to compute it once and
- * cache it here.
- */
- private static final WeakReference
- * NOTE - Depending upon the implementation of
- * the {@code LogFactory} you are using, the {@code Log}
- * instance you are returned may or may not be local to the current
- * application, and may or may not be returned again on a subsequent
- * call with the same name argument.
- *
- * @param name Logical name of the {@code Log} instance to be
- * returned (the meaning of this name is only known to the underlying
- * logging implementation that is being wrapped)
- * @throws LogConfigurationException if a suitable {@code Log}
- * instance cannot be returned
- */
- public abstract Log getInstance(String name)
- throws LogConfigurationException;
-
- /**
- * Release any internal references to previously created {@link Log}
- * instances returned by this factory. This is useful in environments
- * like servlet containers, which implement application reloading by
- * throwing away a ClassLoader. Dangling references to objects in that
- * class loader would prevent garbage collection.
- */
- public abstract void release();
-
- /**
- * Remove any configuration attribute associated with the specified name.
- * If there is no such attribute, no action is taken.
- *
- * @param name Name of the attribute to remove
- */
- public abstract void removeAttribute(String name);
-
- /**
- * Set the configuration attribute with the specified name. Calling
- * this with a {@code null} value is equivalent to calling
- * {@code removeAttribute(name)}.
- *
- * @param name Name of the attribute to set
- * @param value Value of the attribute to set, or {@code null}
- * to remove any setting for this attribute
- */
- public abstract void setAttribute(String name, Object value);
-
- // ------------------------------------------------------- Static Variables
-
- /**
- * The previously constructed {@code LogFactory} instances, keyed by
- * the {@code ClassLoader} with which it was created.
- */
- protected static Hashtable factories;
-
- /**
- * Previously constructed {@code LogFactory} instance as in the
- * {@code factories} map, but for the case where
- * {@code getClassLoader} returns {@code null}.
- * This can happen when:
- *
- * Note that the correct way to ensure no memory leaks occur is to ensure
- * that LogFactory.release(contextClassLoader) is called whenever a
- * webapp is undeployed.
- */
- private static final Hashtable createFactoryStore() {
- Hashtable result = null;
- String storeImplementationClass;
- try {
- storeImplementationClass = getSystemProperty(HASHTABLE_IMPLEMENTATION_PROPERTY, null);
- } catch (final SecurityException ex) {
- // Permissions don't allow this to be accessed. Default to the "modern"
- // weak hashtable implementation if it is available.
- storeImplementationClass = null;
- }
-
- if (storeImplementationClass == null) {
- storeImplementationClass = WEAK_HASHTABLE_CLASSNAME;
- }
- try {
- final Class implementationClass = Class.forName(storeImplementationClass);
- result = (Hashtable) implementationClass.newInstance();
- } catch (final Throwable t) {
- handleThrowable(t); // may re-throw t
-
- // ignore
- if (!WEAK_HASHTABLE_CLASSNAME.equals(storeImplementationClass)) {
- // if the user's trying to set up a custom implementation, give a clue
- if (isDiagnosticsEnabled()) {
- // use internal logging to issue the warning
- logDiagnostic("[ERROR] LogFactory: Load of custom hashtable failed");
- } else {
- // we *really* want this output, even if diagnostics weren't
- // explicitly enabled by the user.
- System.err.println("[ERROR] LogFactory: Load of custom hashtable failed");
- }
- }
- }
- if (result == null) {
- result = new Hashtable();
- }
- return result;
- }
-
- // --------------------------------------------------------- Static Methods
-
- /** Utility method to safely trim a string. */
- private static String trim(final String src) {
- if (src == null) {
- return null;
- }
- return src.trim();
- }
-
- /**
- * Checks whether the supplied Throwable is one that needs to be
- * re-thrown and ignores all others.
- *
- * The following errors are re-thrown:
- *
- *
- * NOTE - If the properties file method of identifying the
- * {@code LogFactory} implementation class is utilized, all of the
- * properties defined in this file will be set as configuration attributes
- * on the corresponding {@code LogFactory} instance.
- *
- * NOTE - In a multi-threaded environment it is possible
- * that two different instances will be returned for the same
- * classloader environment.
- *
- * @throws LogConfigurationException if the implementation class is not
- * available or cannot be instantiated.
- */
- public static LogFactory getFactory() throws LogConfigurationException {
- // Identify the class loader we will be using
- final ClassLoader contextClassLoader = getContextClassLoaderInternal();
-
-
- // This is an odd enough situation to report about. This
- // output will be a nuisance on JDK1.1, as the system
- // classloader is null in that environment.
- if (contextClassLoader == null && isDiagnosticsEnabled()) {
- logDiagnostic("Context classloader is null.");
- }
-
- // Return any previously registered factory for this class loader
- LogFactory factory = getCachedFactory(contextClassLoader);
- if (factory != null) {
- return factory;
- }
-
- if (isDiagnosticsEnabled()) {
- logDiagnostic(
- "[LOOKUP] LogFactory implementation requested for the first time for context classloader " +
- objectId(contextClassLoader));
- logHierarchy("[LOOKUP] ", contextClassLoader);
- }
-
- // Load properties file.
- //
- // If the properties file exists, then its contents are used as
- // "attributes" on the LogFactory implementation class. One particular
- // property may also control which LogFactory concrete subclass is
- // used, but only if other discovery mechanisms fail..
- //
- // As the properties file (if it exists) will be used one way or
- // another in the end we may as well look for it first.
-
- final Properties props = getConfigurationFile(contextClassLoader, FACTORY_PROPERTIES);
-
- // Determine whether we will be using the thread context class loader to
- // load logging classes or not by checking the loaded properties file (if any).
- ClassLoader baseClassLoader = contextClassLoader;
- if (props != null) {
- final String useTCCLStr = props.getProperty(TCCL_KEY);
- // The Boolean.valueOf(useTCCLStr).booleanValue() formulation
- // is required for Java 1.2 compatibility.
- if ((useTCCLStr != null) && !Boolean.parseBoolean(useTCCLStr)) {
- // Don't use current context classloader when locating any
- // LogFactory or Log classes, just use the class that loaded
- // this abstract class. When this class is deployed in a shared
- // classpath of a container, it means webapps cannot deploy their
- // own logging implementations. It also means that it is up to the
- // implementation whether to load library-specific config files
- // from the TCCL or not.
- baseClassLoader = thisClassLoaderRef.get();
- }
- }
-
- // Determine which concrete LogFactory subclass to use.
- // First, try a global system property
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] Looking for system property [" + FACTORY_PROPERTY +
- "] to define the LogFactory subclass to use...");
- }
-
- try {
- final String factoryClass = getSystemProperty(FACTORY_PROPERTY, null);
- if (factoryClass != null) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] Creating an instance of LogFactory class '" + factoryClass +
- "' as specified by system property " + FACTORY_PROPERTY);
- }
- factory = newFactory(factoryClass, baseClassLoader, contextClassLoader);
- } else {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] No system property [" + FACTORY_PROPERTY + "] defined.");
- }
- }
- } catch (final SecurityException e) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] A security exception occurred while trying to create an" +
- " instance of the custom factory class" + ": [" + trim(e.getMessage()) +
- "]. Trying alternative implementations...");
- }
- // ignore
- } catch (final RuntimeException e) {
- // This is not consistent with the behavior when a bad LogFactory class is
- // specified in a services file.
- //
- // One possible exception that can occur here is a ClassCastException when
- // the specified class wasn't castable to this LogFactory type.
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] An exception occurred while trying to create an" +
- " instance of the custom factory class" + ": [" +
- trim(e.getMessage()) +
- "] as specified by a system property.");
- }
- throw e;
- }
-
- // Second, try to find a service by using the JDK1.3 class
- // discovery mechanism, which involves putting a file with the name
- // of an interface class in the META-INF/services directory, where the
- // contents of the file is a single line specifying a concrete class
- // that implements the desired interface.
-
- if (factory == null) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] Looking for a resource file of name [" + SERVICE_ID +
- "] to define the LogFactory subclass to use...");
- }
- try {
- final InputStream is = getResourceAsStream(contextClassLoader, SERVICE_ID);
-
- if ( is != null ) {
- // This code is needed by EBCDIC and other strange systems.
- // It's a fix for bugs reported in xerces
- BufferedReader rd;
- try {
- rd = new BufferedReader(new InputStreamReader(is, "UTF-8"));
- } catch (final java.io.UnsupportedEncodingException e) {
- rd = new BufferedReader(new InputStreamReader(is));
- }
-
- String factoryClassName;
- try {
- factoryClassName = rd.readLine();
- } finally {
- rd.close();
- }
-
- if (factoryClassName != null && ! factoryClassName.isEmpty()) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] Creating an instance of LogFactory class " +
- factoryClassName +
- " as specified by file '" + SERVICE_ID +
- "' which was present in the path of the context classloader.");
- }
- factory = newFactory(factoryClassName, baseClassLoader, contextClassLoader );
- }
- } else {
- // is == null
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] No resource file with name '" + SERVICE_ID + "' found.");
- }
- }
- } catch (final Exception ex) {
- // note: if the specified LogFactory class wasn't compatible with LogFactory
- // for some reason, a ClassCastException will be caught here, and attempts will
- // continue to find a compatible class.
- if (isDiagnosticsEnabled()) {
- logDiagnostic(
- "[LOOKUP] A security exception occurred while trying to create an" +
- " instance of the custom factory class" +
- ": [" + trim(ex.getMessage()) +
- "]. Trying alternative implementations...");
- }
- // ignore
- }
- }
-
- // Third try looking into the properties file read earlier (if found)
-
- if (factory == null) {
- if (props != null) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic(
- "[LOOKUP] Looking in properties file for entry with key '" + FACTORY_PROPERTY +
- "' to define the LogFactory subclass to use...");
- }
- final String factoryClass = props.getProperty(FACTORY_PROPERTY);
- if (factoryClass != null) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic(
- "[LOOKUP] Properties file specifies LogFactory subclass '" + factoryClass + "'");
- }
- factory = newFactory(factoryClass, baseClassLoader, contextClassLoader);
-
- // TODO: think about whether we need to handle exceptions from newFactory
- } else {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] Properties file has no entry specifying LogFactory subclass.");
- }
- }
- } else {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] No properties file available to determine" + " LogFactory subclass from..");
- }
- }
- }
-
- // Fourth, try the fallback implementation class
-
- if (factory == null) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic(
- "[LOOKUP] Loading the default LogFactory implementation '" + FACTORY_DEFAULT +
- "' via the same classloader that loaded this LogFactory" +
- " class (ie not looking in the context classloader).");
- }
-
- // Note: unlike the above code which can try to load custom LogFactory
- // implementations via the TCCL, we don't try to load the default LogFactory
- // implementation via the context classloader because:
- // * that can cause problems (see comments in newFactory method)
- // * no-one should be customising the code of the default class
- // Yes, we do give up the ability for the child to ship a newer
- // version of the LogFactoryImpl class and have it used dynamically
- // by an old LogFactory class in the parent, but that isn't
- // necessarily a good idea anyway.
- factory = newFactory(FACTORY_DEFAULT, thisClassLoaderRef.get(), contextClassLoader);
- }
-
- if (factory != null) {
- /**
- * Always cache using context class loader.
- */
- cacheFactory(contextClassLoader, factory);
-
- if (props != null) {
- final Enumeration names = props.propertyNames();
- while (names.hasMoreElements()) {
- final String name = (String) names.nextElement();
- final String value = props.getProperty(name);
- factory.setAttribute(name, value);
- }
- }
- }
-
- return factory;
- }
-
- /**
- * Convenience method to return a named logger, without the application
- * having to care about factories.
- *
- * @param clazz Class from which a log name will be derived
- * @throws LogConfigurationException if a suitable {@code Log}
- * instance cannot be returned
- */
- public static Log getLog(final Class clazz) throws LogConfigurationException {
- return getFactory().getInstance(clazz);
- }
-
- /**
- * Convenience method to return a named logger, without the application
- * having to care about factories.
- *
- * @param name Logical name of the {@code Log} instance to be
- * returned (the meaning of this name is only known to the underlying
- * logging implementation that is being wrapped)
- * @throws LogConfigurationException if a suitable {@code Log}
- * instance cannot be returned
- */
- public static Log getLog(final String name) throws LogConfigurationException {
- return getFactory().getInstance(name);
- }
-
- /**
- * Release any internal references to previously created {@link LogFactory}
- * instances that have been associated with the specified class loader
- * (if any), after calling the instance method {@code release()} on
- * each of them.
- *
- * @param classLoader ClassLoader for which to release the LogFactory
- */
- public static void release(final ClassLoader classLoader) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Releasing factory for classloader " + objectId(classLoader));
- }
- // factories is not final and could be replaced in this block.
- final Hashtable factories = LogFactory.factories;
- synchronized (factories) {
- if (classLoader == null) {
- if (nullClassLoaderFactory != null) {
- nullClassLoaderFactory.release();
- nullClassLoaderFactory = null;
- }
- } else {
- final LogFactory factory = (LogFactory) factories.get(classLoader);
- if (factory != null) {
- factory.release();
- factories.remove(classLoader);
- }
- }
- }
- }
-
- /**
- * Release any internal references to previously created {@link LogFactory}
- * instances, after calling the instance method {@code release()} on
- * each of them. This is useful in environments like servlet containers,
- * which implement application reloading by throwing away a ClassLoader.
- * Dangling references to objects in that class loader would prevent
- * garbage collection.
- */
- public static void releaseAll() {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Releasing factory for all classloaders.");
- }
- // factories is not final and could be replaced in this block.
- final Hashtable factories = LogFactory.factories;
- synchronized (factories) {
- final Enumeration elements = factories.elements();
- while (elements.hasMoreElements()) {
- final LogFactory element = (LogFactory) elements.nextElement();
- element.release();
- }
- factories.clear();
-
- if (nullClassLoaderFactory != null) {
- nullClassLoaderFactory.release();
- nullClassLoaderFactory = null;
- }
- }
- }
-
- // ------------------------------------------------------ Protected Methods
-
- /**
- * Safely get access to the classloader for the specified class.
- *
- * Theoretically, calling getClassLoader can throw a security exception,
- * and so should be done under an AccessController in order to provide
- * maximum flexibility. However in practice people don't appear to use
- * security policies that forbid getClassLoader calls. So for the moment
- * all code is written to call this method rather than Class.getClassLoader,
- * so that we could put AccessController stuff in this method without any
- * disruption later if we need to.
- *
- * Even when using an AccessController, however, this method can still
- * throw SecurityException. Commons-logging basically relies on the
- * ability to access classloaders, ie a policy that forbids all
- * classloader access will also prevent commons-logging from working:
- * currently this method will throw an exception preventing the entire app
- * from starting up. Maybe it would be good to detect this situation and
- * just disable all commons-logging? Not high priority though - as stated
- * above, security policies that prevent classloader access aren't common.
- *
- * Note that returning an object fetched via an AccessController would
- * technically be a security flaw anyway; untrusted code that has access
- * to a trusted JCL library could use it to fetch the classloader for
- * a class even when forbidden to do so directly.
- *
- * @since 1.1
- */
- protected static ClassLoader getClassLoader(final Class clazz) {
- try {
- return clazz.getClassLoader();
- } catch (final SecurityException ex) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Unable to get classloader for class '" + clazz +
- "' due to security restrictions - " + ex.getMessage());
- }
- throw ex;
- }
- }
-
- /**
- * Returns the current context classloader.
- *
- * In versions prior to 1.1, this method did not use an AccessController.
- * In version 1.1, an AccessController wrapper was incorrectly added to
- * this method, causing a minor security flaw.
- *
- * In version 1.1.1 this change was reverted; this method no longer uses
- * an AccessController. User code wishing to obtain the context classloader
- * must invoke this method via AccessController.doPrivileged if it needs
- * support for that.
- *
- * @return the context classloader associated with the current thread,
- * or null if security doesn't allow it.
- * @throws LogConfigurationException if there was some weird error while
- * attempting to get the context classloader.
- */
- protected static ClassLoader getContextClassLoader() throws LogConfigurationException {
- return directGetContextClassLoader();
- }
-
- /**
- * Calls LogFactory.directGetContextClassLoader under the control of an
- * AccessController class. This means that java code running under a
- * security manager that forbids access to ClassLoaders will still work
- * if this class is given appropriate privileges, even when the caller
- * doesn't have such privileges. Without using an AccessController, the
- * the entire call stack must have the privilege before the call is
- * allowed.
- *
- * @return the context classloader associated with the current thread,
- * or null if security doesn't allow it.
- * @throws LogConfigurationException if there was some weird error while
- * attempting to get the context classloader.
- */
- private static ClassLoader getContextClassLoaderInternal() throws LogConfigurationException {
- return (ClassLoader)AccessController.doPrivileged(
- new PrivilegedAction() {
- @Override
- public Object run() {
- return directGetContextClassLoader();
- }
- });
- }
-
- /**
- * Return the thread context class loader if available; otherwise return null.
- *
- * Most/all code should call getContextClassLoaderInternal rather than
- * calling this method directly.
- *
- * The thread context class loader is available for JDK 1.2
- * or later, if certain security conditions are met.
- *
- * Note that no internal logging is done within this method because
- * this method is called every time LogFactory.getLogger() is called,
- * and we don't want too much output generated here.
- *
- * @throws LogConfigurationException if a suitable class loader
- * cannot be identified.
- * @return the thread's context classloader or {@code null} if the java security
- * policy forbids access to the context classloader from one of the classes
- * in the current call stack.
- * @since 1.1
- */
- protected static ClassLoader directGetContextClassLoader() throws LogConfigurationException {
- ClassLoader classLoader = null;
-
- try {
- classLoader = Thread.currentThread().getContextClassLoader();
- } catch (final SecurityException ex) {
- /**
- * getContextClassLoader() throws SecurityException when
- * the context class loader isn't an ancestor of the
- * calling class's class loader, or if security
- * permissions are restricted.
- *
- * We ignore this exception to be consistent with the previous
- * behavior (e.g. 1.1.3 and earlier).
- */
- // ignore
- }
-
- // Return the selected class loader
- return classLoader;
- }
-
- /**
- * Check cached factories (keyed by contextClassLoader)
- *
- * @param contextClassLoader is the context classloader associated
- * with the current thread. This allows separate LogFactory objects
- * per component within a container, provided each component has
- * a distinct context classloader set. This parameter may be null
- * in JDK1.1, and in embedded systems where jcl-using code is
- * placed in the bootclasspath.
- *
- * @return the factory associated with the specified classloader if
- * one has previously been created, or null if this is the first time
- * we have seen this particular classloader.
- */
- private static LogFactory getCachedFactory(final ClassLoader contextClassLoader) {
- if (contextClassLoader == null) {
- // We have to handle this specially, as factories is a Hashtable
- // and those don't accept null as a key value.
- //
- // nb: nullClassLoaderFactory might be null. That's ok.
- return nullClassLoaderFactory;
- }
- return (LogFactory) factories.get(contextClassLoader);
- }
-
- /**
- * Remember this factory, so later calls to LogFactory.getCachedFactory
- * can return the previously created object (together with all its
- * cached Log objects).
- *
- * @param classLoader should be the current context classloader. Note that
- * this can be null under some circumstances; this is ok.
- * @param factory should be the factory to cache. This should never be null.
- */
- private static void cacheFactory(final ClassLoader classLoader, final LogFactory factory) {
- // Ideally we would assert(factory != null) here. However reporting
- // errors from within a logging implementation is a little tricky!
-
- if (factory != null) {
- if (classLoader == null) {
- nullClassLoaderFactory = factory;
- } else {
- factories.put(classLoader, factory);
- }
- }
- }
-
- /**
- * Return a new instance of the specified {@code LogFactory}
- * implementation class, loaded by the specified class loader.
- * If that fails, try the class loader used to load this
- * (abstract) LogFactory.
- *
- * Note that there can be problems if the specified ClassLoader is not the
- * same as the classloader that loaded this class, ie when loading a
- * concrete LogFactory subclass via a context classloader.
- *
- * The problem is the same one that can occur when loading a concrete Log
- * subclass via a context classloader.
- *
- * The problem occurs when code running in the context classloader calls
- * class X which was loaded via a parent classloader, and class X then calls
- * LogFactory.getFactory (either directly or via LogFactory.getLog). Because
- * class X was loaded via the parent, it binds to LogFactory loaded via
- * the parent. When the code in this method finds some LogFactoryYYYY
- * class in the child (context) classloader, and there also happens to be a
- * LogFactory class defined in the child classloader, then LogFactoryYYYY
- * will be bound to LogFactory@childloader. It cannot be cast to
- * LogFactory@parentloader, ie this method cannot return the object as
- * the desired type. Note that it doesn't matter if the LogFactory class
- * in the child classloader is identical to the LogFactory class in the
- * parent classloader, they are not compatible.
- *
- * The solution taken here is to simply print out an error message when
- * this occurs then throw an exception. The deployer of the application
- * must ensure they remove all occurrences of the LogFactory class from
- * the child classloader in order to resolve the issue. Note that they
- * do not have to move the custom LogFactory subclass; that is ok as
- * long as the only LogFactory class it can find to bind to is in the
- * parent classloader.
- *
- * @param factoryClass Fully qualified name of the {@code LogFactory}
- * implementation class
- * @param classLoader ClassLoader from which to load this class
- * @param contextClassLoader is the context that this new factory will
- * manage logging for.
- * @throws LogConfigurationException if a suitable instance
- * cannot be created
- * @since 1.1
- */
- protected static LogFactory newFactory(final String factoryClass,
- final ClassLoader classLoader,
- final ClassLoader contextClassLoader)
- throws LogConfigurationException {
- // Note that any unchecked exceptions thrown by the createFactory
- // method will propagate out of this method; in particular a
- // ClassCastException can be thrown.
- final Object result = AccessController.doPrivileged(
- new PrivilegedAction() {
- @Override
- public Object run() {
- return createFactory(factoryClass, classLoader);
- }
- });
-
- if (result instanceof LogConfigurationException) {
- final LogConfigurationException ex = (LogConfigurationException) result;
- if (isDiagnosticsEnabled()) {
- logDiagnostic("An error occurred while loading the factory class:" + ex.getMessage());
- }
- throw ex;
- }
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Created object " + objectId(result) + " to manage classloader " +
- objectId(contextClassLoader));
- }
- return (LogFactory)result;
- }
-
- /**
- * Method provided for backwards compatibility; see newFactory version that
- * takes 3 parameters.
- *
- * This method would only ever be called in some rather odd situation.
- * Note that this method is static, so overriding in a subclass doesn't
- * have any effect unless this method is called from a method in that
- * subclass. However this method only makes sense to use from the
- * getFactory method, and as that is almost always invoked via
- * LogFactory.getFactory, any custom definition in a subclass would be
- * pointless. Only a class with a custom getFactory method, then invoked
- * directly via CustomFactoryImpl.getFactory or similar would ever call
- * this. Anyway, it's here just in case, though the "managed class loader"
- * value output to the diagnostics will not report the correct value.
- */
- protected static LogFactory newFactory(final String factoryClass,
- final ClassLoader classLoader) {
- return newFactory(factoryClass, classLoader, null);
- }
-
- /**
- * Implements the operations described in the javadoc for newFactory.
- *
- * @param factoryClass
- * @param classLoader used to load the specified factory class. This is
- * expected to be either the TCCL or the classloader which loaded this
- * class. Note that the classloader which loaded this class might be
- * "null" (ie the bootloader) for embedded systems.
- * @return either a LogFactory object or a LogConfigurationException object.
- * @since 1.1
- */
- protected static Object createFactory(final String factoryClass, final ClassLoader classLoader) {
- // This will be used to diagnose bad configurations
- // and allow a useful message to be sent to the user
- Class logFactoryClass = null;
- try {
- if (classLoader != null) {
- try {
- // First the given class loader param (thread class loader)
-
- // Warning: must typecast here & allow exception
- // to be generated/caught & recast properly.
- logFactoryClass = classLoader.loadClass(factoryClass);
- if (LogFactory.class.isAssignableFrom(logFactoryClass)) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Loaded class " + logFactoryClass.getName() +
- " from classloader " + objectId(classLoader));
- }
- } else {
- //
- // This indicates a problem with the ClassLoader tree.
- // An incompatible ClassLoader was used to load the
- // implementation.
- // As the same classes
- // must be available in multiple class loaders,
- // it is very likely that multiple JCL jars are present.
- // The most likely fix for this
- // problem is to remove the extra JCL jars from the
- // ClassLoader hierarchy.
- //
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Factory class " + logFactoryClass.getName() +
- " loaded from classloader " + objectId(logFactoryClass.getClassLoader()) +
- " does not extend '" + LogFactory.class.getName() +
- "' as loaded by this classloader.");
- logHierarchy("[BAD CL TREE] ", classLoader);
- }
- }
-
- return (LogFactory) logFactoryClass.newInstance();
-
- } catch (final ClassNotFoundException ex) {
- if (classLoader == thisClassLoaderRef.get()) {
- // Nothing more to try, onwards.
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Unable to locate any class called '" + factoryClass +
- "' via classloader " + objectId(classLoader));
- }
- throw ex;
- }
- // ignore exception, continue
- } catch (final NoClassDefFoundError e) {
- if (classLoader == thisClassLoaderRef.get()) {
- // Nothing more to try, onwards.
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Class '" + factoryClass + "' cannot be loaded" +
- " via classloader " + objectId(classLoader) +
- " - it depends on some other class that cannot be found.");
- }
- throw e;
- }
- // ignore exception, continue
- } catch (final ClassCastException e) {
- if (classLoader == thisClassLoaderRef.get()) {
- // There's no point in falling through to the code below that
- // tries again with thisClassLoaderRef, because we've just tried
- // loading with that loader (not the TCCL). Just throw an
- // appropriate exception here.
-
- final boolean implementsLogFactory = implementsLogFactory(logFactoryClass);
-
- //
- // Construct a good message: users may not actual expect that a custom implementation
- // has been specified. Several well known containers use this mechanism to adapt JCL
- // to their native logging system.
- //
- final StringBuilder msg = new StringBuilder();
- msg.append("The application has specified that a custom LogFactory implementation ");
- msg.append("should be used but Class '");
- msg.append(factoryClass);
- msg.append("' cannot be converted to '");
- msg.append(LogFactory.class.getName());
- msg.append("'. ");
- if (implementsLogFactory) {
- msg.append("The conflict is caused by the presence of multiple LogFactory classes ");
- msg.append("in incompatible classloaders. ");
- msg.append("Background can be found in http://commons.apache.org/logging/tech.html. ");
- msg.append("If you have not explicitly specified a custom LogFactory then it is likely ");
- msg.append("that the container has set one without your knowledge. ");
- msg.append("In this case, consider using the commons-logging-adapters.jar file or ");
- msg.append("specifying the standard LogFactory from the command line. ");
- } else {
- msg.append("Please check the custom implementation. ");
- }
- msg.append("Help can be found @http://commons.apache.org/logging/troubleshooting.html.");
-
- if (isDiagnosticsEnabled()) {
- logDiagnostic(msg.toString());
- }
-
- throw new ClassCastException(msg.toString());
- }
-
- // Ignore exception, continue. Presumably the classloader was the
- // TCCL; the code below will try to load the class via thisClassLoaderRef.
- // This will handle the case where the original calling class is in
- // a shared classpath but the TCCL has a copy of LogFactory and the
- // specified LogFactory implementation; we will fall back to using the
- // LogFactory implementation from the same classloader as this class.
- //
- // Issue: this doesn't handle the reverse case, where this LogFactory
- // is in the webapp, and the specified LogFactory implementation is
- // in a shared classpath. In that case:
- // (a) the class really does implement LogFactory (bad log msg above)
- // (b) the fallback code will result in exactly the same problem.
- }
- }
-
- /* At this point, either classLoader == null, OR
- * classLoader was unable to load factoryClass.
- *
- * In either case, we call Class.forName, which is equivalent
- * to LogFactory.class.getClassLoader().load(name), ie we ignore
- * the classloader parameter the caller passed, and fall back
- * to trying the classloader associated with this class. See the
- * javadoc for the newFactory method for more info on the
- * consequences of this.
- *
- * Notes:
- * * LogFactory.class.getClassLoader() may return 'null'
- * if LogFactory is loaded by the bootstrap classloader.
- */
- // Warning: must typecast here & allow exception
- // to be generated/caught & recast properly.
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Unable to load factory class via classloader " + objectId(classLoader) +
- " - trying the classloader associated with this LogFactory.");
- }
- logFactoryClass = Class.forName(factoryClass);
- return (LogFactory) logFactoryClass.newInstance();
- } catch (final Exception e) {
- // Check to see if we've got a bad configuration
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Unable to create LogFactory instance.");
- }
- if (logFactoryClass != null && !LogFactory.class.isAssignableFrom(logFactoryClass)) {
- return new LogConfigurationException(
- "The chosen LogFactory implementation does not extend LogFactory." +
- " Please check your configuration.", e);
- }
- return new LogConfigurationException(e);
- }
- }
-
- /**
- * Determines whether the given class actually implements {@code LogFactory}.
- * Diagnostic information is also logged.
- *
- * Usage: to diagnose whether a classloader conflict is the cause
- * of incompatibility. The test used is whether the class is assignable from
- * the {@code LogFactory} class loaded by the class's classloader.
- * @param logFactoryClass {@code Class} which may implement {@code LogFactory}
- * @return true if the {@code logFactoryClass} does extend
- * {@code LogFactory} when that class is loaded via the same
- * classloader that loaded the {@code logFactoryClass}.
- */
- private static boolean implementsLogFactory(final Class logFactoryClass) {
- boolean implementsLogFactory = false;
- if (logFactoryClass != null) {
- try {
- final ClassLoader logFactoryClassLoader = logFactoryClass.getClassLoader();
- if (logFactoryClassLoader == null) {
- logDiagnostic("[CUSTOM LOG FACTORY] was loaded by the boot classloader");
- } else {
- logHierarchy("[CUSTOM LOG FACTORY] ", logFactoryClassLoader);
- final Class factoryFromCustomLoader
- = Class.forName("org.apache.commons.logging.LogFactory", false, logFactoryClassLoader);
- implementsLogFactory = factoryFromCustomLoader.isAssignableFrom(logFactoryClass);
- if (implementsLogFactory) {
- logDiagnostic("[CUSTOM LOG FACTORY] " + logFactoryClass.getName() +
- " implements LogFactory but was loaded by an incompatible classloader.");
- } else {
- logDiagnostic("[CUSTOM LOG FACTORY] " + logFactoryClass.getName() +
- " does not implement LogFactory.");
- }
- }
- } catch (final SecurityException e) {
- //
- // The application is running within a hostile security environment.
- // This will make it very hard to diagnose issues with JCL.
- // Consider running less securely whilst debugging this issue.
- //
- logDiagnostic("[CUSTOM LOG FACTORY] SecurityException thrown whilst trying to determine whether " +
- "the compatibility was caused by a classloader conflict: " + e.getMessage());
- } catch (final LinkageError e) {
- //
- // This should be an unusual circumstance.
- // LinkageError's usually indicate that a dependent class has incompatibly changed.
- // Another possibility may be an exception thrown by an initializer.
- // Time for a clean rebuild?
- //
- logDiagnostic("[CUSTOM LOG FACTORY] LinkageError thrown whilst trying to determine whether " +
- "the compatibility was caused by a classloader conflict: " + e.getMessage());
- } catch (final ClassNotFoundException e) {
- //
- // LogFactory cannot be loaded by the classloader which loaded the custom factory implementation.
- // The custom implementation is not viable until this is corrected.
- // Ensure that the JCL jar and the custom class are available from the same classloader.
- // Running with diagnostics on should give information about the classloaders used
- // to load the custom factory.
- //
- logDiagnostic("[CUSTOM LOG FACTORY] LogFactory class cannot be loaded by classloader which loaded " +
- "the custom LogFactory implementation. Is the custom factory in the right classloader?");
- }
- }
- return implementsLogFactory;
- }
-
- /**
- * Applets may run in an environment where accessing resources of a loader is
- * a secure operation, but where the commons-logging library has explicitly
- * been granted permission for that operation. In this case, we need to
- * run the operation using an AccessController.
- */
- private static InputStream getResourceAsStream(final ClassLoader loader, final String name) {
- return (InputStream)AccessController.doPrivileged(
- new PrivilegedAction() {
- @Override
- public Object run() {
- if (loader != null) {
- return loader.getResourceAsStream(name);
- }
- return ClassLoader.getSystemResourceAsStream(name);
- }
- });
- }
-
- /**
- * Given a filename, return an enumeration of URLs pointing to
- * all the occurrences of that filename in the classpath.
- *
- * This is just like ClassLoader.getResources except that the
- * operation is done under an AccessController so that this method will
- * succeed when this jarfile is privileged but the caller is not.
- * This method must therefore remain private to avoid security issues.
- *
- * If no instances are found, an Enumeration is returned whose
- * hasMoreElements method returns false (ie an "empty" enumeration).
- * If resources could not be listed for some reason, null is returned.
- */
- private static Enumeration getResources(final ClassLoader loader, final String name) {
- final PrivilegedAction action =
- new PrivilegedAction() {
- @Override
- public Object run() {
- try {
- if (loader != null) {
- return loader.getResources(name);
- }
- return ClassLoader.getSystemResources(name);
- } catch (final IOException e) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Exception while trying to find configuration file " +
- name + ":" + e.getMessage());
- }
- return null;
- } catch (final NoSuchMethodError e) {
- // we must be running on a 1.1 JVM which doesn't support
- // ClassLoader.getSystemResources; just return null in
- // this case.
- return null;
- }
- }
- };
- final Object result = AccessController.doPrivileged(action);
- return (Enumeration) result;
- }
-
- /**
- * Given a URL that refers to a .properties file, load that file.
- * This is done under an AccessController so that this method will
- * succeed when this jarfile is privileged but the caller is not.
- * This method must therefore remain private to avoid security issues.
- *
- * {@code Null} is returned if the URL cannot be opened.
- */
- private static Properties getProperties(final URL url) {
- final PrivilegedAction action =
- new PrivilegedAction() {
- @Override
- public Object run() {
- InputStream stream = null;
- try {
- // We must ensure that useCaches is set to false, as the
- // default behavior of java is to cache file handles, and
- // this "locks" files, preventing hot-redeploy on windows.
- final URLConnection connection = url.openConnection();
- connection.setUseCaches(false);
- stream = connection.getInputStream();
- if (stream != null) {
- final Properties props = new Properties();
- props.load(stream);
- stream.close();
- stream = null;
- return props;
- }
- } catch (final IOException e) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Unable to read URL " + url);
- }
- } finally {
- if (stream != null) {
- try {
- stream.close();
- } catch (final IOException e) {
- // ignore exception; this should not happen
- if (isDiagnosticsEnabled()) {
- logDiagnostic("Unable to close stream for URL " + url);
- }
- }
- }
- }
-
- return null;
- }
- };
- return (Properties) AccessController.doPrivileged(action);
- }
-
- /**
- * Locate a user-provided configuration file.
- *
- * The classpath of the specified classLoader (usually the context classloader)
- * is searched for properties files of the specified name. If none is found,
- * null is returned. If more than one is found, then the file with the greatest
- * value for its PRIORITY property is returned. If multiple files have the
- * same PRIORITY value then the first in the classpath is returned.
- *
- * This differs from the 1.0.x releases; those always use the first one found.
- * However as the priority is a new field, this change is backwards compatible.
- *
- * The purpose of the priority field is to allow a webserver administrator to
- * override logging settings in all webapps by placing a commons-logging.properties
- * file in a shared classpath location with a priority > 0; this overrides any
- * commons-logging.properties files without priorities which are in the
- * webapps. Webapps can also use explicit priorities to override a configuration
- * file in the shared classpath if needed.
- */
- private static final Properties getConfigurationFile(final ClassLoader classLoader, final String fileName) {
- Properties props = null;
- double priority = 0.0;
- URL propsUrl = null;
- try {
- final Enumeration urls = getResources(classLoader, fileName);
-
- if (urls == null) {
- return null;
- }
-
- while (urls.hasMoreElements()) {
- final URL url = (URL) urls.nextElement();
-
- final Properties newProps = getProperties(url);
- if (newProps != null) {
- if (props == null) {
- propsUrl = url;
- props = newProps;
- final String priorityStr = props.getProperty(PRIORITY_KEY);
- priority = 0.0;
- if (priorityStr != null) {
- priority = Double.parseDouble(priorityStr);
- }
-
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] Properties file found at '" + url + "'" +
- " with priority " + priority);
- }
- } else {
- final String newPriorityStr = newProps.getProperty(PRIORITY_KEY);
- double newPriority = 0.0;
- if (newPriorityStr != null) {
- newPriority = Double.parseDouble(newPriorityStr);
- }
-
- if (newPriority > priority) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] Properties file at '" + url + "'" +
- " with priority " + newPriority +
- " overrides file at '" + propsUrl + "'" +
- " with priority " + priority);
- }
-
- propsUrl = url;
- props = newProps;
- priority = newPriority;
- } else {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("[LOOKUP] Properties file at '" + url + "'" +
- " with priority " + newPriority +
- " does not override file at '" + propsUrl + "'" +
- " with priority " + priority);
- }
- }
- }
-
- }
- }
- } catch (final SecurityException e) {
- if (isDiagnosticsEnabled()) {
- logDiagnostic("SecurityException thrown while trying to find/read config files.");
- }
- }
-
- if (isDiagnosticsEnabled()) {
- if (props == null) {
- logDiagnostic("[LOOKUP] No properties file of name '" + fileName + "' found.");
- } else {
- logDiagnostic("[LOOKUP] Properties file of name '" + fileName + "' found at '" + propsUrl + '"');
- }
- }
-
- return props;
- }
-
- /**
- * Read the specified system property, using an AccessController so that
- * the property can be read if JCL has been granted the appropriate
- * security rights even if the calling code has not.
- *
- * Take care not to expose the value returned by this method to the
- * calling application in any way; otherwise the calling app can use that
- * info to access data that should not be available to it.
- */
- private static String getSystemProperty(final String key, final String def)
- throws SecurityException {
- return (String) AccessController.doPrivileged(
- new PrivilegedAction() {
- @Override
- public Object run() {
- return System.getProperty(key, def);
- }
- });
- }
-
- /**
- * Determines whether the user wants internal diagnostic output. If so,
- * returns an appropriate writer object. Users can enable diagnostic
- * output by setting the system property named {@link #DIAGNOSTICS_DEST_PROPERTY} to
- * a filename, or the special values STDOUT or STDERR.
- */
- private static PrintStream initDiagnostics() {
- String dest;
- try {
- dest = getSystemProperty(DIAGNOSTICS_DEST_PROPERTY, null);
- if (dest == null) {
- return null;
- }
- } catch (final SecurityException ex) {
- // We must be running in some very secure environment.
- // We just have to assume output is not wanted..
- return null;
- }
-
- if (dest.equals("STDOUT")) {
- return System.out;
- }
- if (dest.equals("STDERR")) {
- return System.err;
- }
- try {
- // open the file in append mode
- final FileOutputStream fos = new FileOutputStream(dest, true);
- return new PrintStream(fos);
- } catch (final IOException ex) {
- // We should report this to the user - but how?
- return null;
- }
- }
-
- /**
- * Indicates true if the user has enabled internal logging.
- *
- * By the way, sorry for the incorrect grammar, but calling this method
- * areDiagnosticsEnabled just isn't java beans style.
- *
- * @return true if calls to logDiagnostic will have any effect.
- * @since 1.1
- */
- protected static boolean isDiagnosticsEnabled() {
- return DIAGNOSTICS_STREAM != null;
- }
-
- /**
- * Write the specified message to the internal logging destination.
- *
- * Note that this method is private; concrete subclasses of this class
- * should not call it because the diagnosticPrefix string this
- * method puts in front of all its messages is LogFactory@....,
- * while subclasses should put SomeSubClass@...
- *
- * Subclasses should instead compute their own prefix, then call
- * logRawDiagnostic. Note that calling isDiagnosticsEnabled is
- * fine for subclasses.
- *
- * Note that it is safe to call this method before initDiagnostics
- * is called; any output will just be ignored (as isDiagnosticsEnabled
- * will return false).
- *
- * @param msg is the diagnostic message to be output.
- */
- private static final void logDiagnostic(final String msg) {
- if (DIAGNOSTICS_STREAM != null) {
- DIAGNOSTICS_STREAM.print(diagnosticPrefix);
- DIAGNOSTICS_STREAM.println(msg);
- DIAGNOSTICS_STREAM.flush();
- }
- }
-
- /**
- * Write the specified message to the internal logging destination.
- *
- * @param msg is the diagnostic message to be output.
- * @since 1.1
- */
- protected static final void logRawDiagnostic(final String msg) {
- if (DIAGNOSTICS_STREAM != null) {
- DIAGNOSTICS_STREAM.println(msg);
- DIAGNOSTICS_STREAM.flush();
- }
- }
-
- /**
- * Generate useful diagnostics regarding the classloader tree for
- * the specified class.
- *
- * As an example, if the specified class was loaded via a webapp's
- * classloader, then you may get the following output:
- *
- * This method returns immediately if isDiagnosticsEnabled()
- * returns false.
- *
- * @param clazz is the class whose classloader + tree are to be
- * output.
- */
- private static void logClassLoaderEnvironment(final Class clazz) {
- if (!isDiagnosticsEnabled()) {
- return;
- }
-
- try {
- // Deliberately use System.getProperty here instead of getSystemProperty; if
- // the overall security policy for the calling application forbids access to
- // these variables then we do not want to output them to the diagnostic stream.
- logDiagnostic("[ENV] Extension directories (java.ext.dir): " + System.getProperty("java.ext.dir"));
- logDiagnostic("[ENV] Application classpath (java.class.path): " + System.getProperty("java.class.path"));
- } catch (final SecurityException ex) {
- logDiagnostic("[ENV] Security setting prevent interrogation of system classpaths.");
- }
-
- final String className = clazz.getName();
- ClassLoader classLoader;
-
- try {
- classLoader = getClassLoader(clazz);
- } catch (final SecurityException ex) {
- // not much useful diagnostics we can print here!
- logDiagnostic("[ENV] Security forbids determining the classloader for " + className);
- return;
- }
-
- logDiagnostic("[ENV] Class " + className + " was loaded via classloader " + objectId(classLoader));
- logHierarchy("[ENV] Ancestry of classloader which loaded " + className + " is ", classLoader);
- }
-
- /**
- * Logs diagnostic messages about the given classloader
- * and it's hierarchy. The prefix is prepended to the message
- * and is intended to make it easier to understand the logs.
- * @param prefix
- * @param classLoader
- */
- private static void logHierarchy(final String prefix, ClassLoader classLoader) {
- if (!isDiagnosticsEnabled()) {
- return;
- }
- ClassLoader systemClassLoader;
- if (classLoader != null) {
- final String classLoaderString = classLoader.toString();
- logDiagnostic(prefix + objectId(classLoader) + " == '" + classLoaderString + "'");
- }
-
- try {
- systemClassLoader = ClassLoader.getSystemClassLoader();
- } catch (final SecurityException ex) {
- logDiagnostic(prefix + "Security forbids determining the system classloader.");
- return;
- }
- if (classLoader != null) {
- final StringBuilder buf = new StringBuilder(prefix + "ClassLoader tree:");
- for(;;) {
- buf.append(objectId(classLoader));
- if (classLoader == systemClassLoader) {
- buf.append(" (SYSTEM) ");
- }
-
- try {
- classLoader = classLoader.getParent();
- } catch (final SecurityException ex) {
- buf.append(" --> SECRET");
- break;
- }
-
- buf.append(" --> ");
- if (classLoader == null) {
- buf.append("BOOT");
- break;
- }
- }
- logDiagnostic(buf.toString());
- }
- }
-
- /**
- * Returns a string that uniquely identifies the specified object, including
- * its class.
- *
- * The returned string is of form "classname@hashCode", ie is the same as
- * the return value of the Object.toString() method, but works even when
- * the specified object's class has overidden the toString method.
- *
- * @param o may be null.
- * @return a string of form classname@hashCode, or "null" if param o is null.
- * @since 1.1
- */
- public static String objectId(final Object o) {
- if (o == null) {
- return "null";
- }
- return o.getClass().getName() + "@" + System.identityHashCode(o);
- }
-
- // ----------------------------------------------------------------------
- // Static initializer block to perform initialization at class load time.
- //
- // We can't do this in the class constructor, as there are many
- // static methods on this class that can be called before any
- // LogFactory instances are created, and they depend upon this
- // stuff having been set up.
- //
- // Note that this block must come after any variable declarations used
- // by any methods called from this block, as we want any static initializer
- // associated with the variable to run first. If static initializers for
- // variables run after this code, then (a) their value might be needed
- // by methods called from here, and (b) they might *override* any value
- // computed here!
- //
- // So the wisest thing to do is just to place this code at the very end
- // of the class file.
- // ----------------------------------------------------------------------
-
- static {
- // note: it's safe to call methods before initDiagnostics (though
- // diagnostic output gets discarded).
- ClassLoader thisClassLoader = getClassLoader(LogFactory.class);
- thisClassLoaderRef = new WeakReference
+ * IMPLEMENTATION NOTE - This implementation is heavily
+ * based on the SAXParserFactory and DocumentBuilderFactory implementations
+ * (corresponding to the JAXP pluggability APIs) found in Apache Xerces.
+ */
+public abstract class LogFactory {
+ // Implementation note re AccessController usage
+ //
+ // It is important to keep code invoked via an AccessController to small
+ // auditable blocks. Such code must carefully evaluate all user input
+ // (parameters, system properties, config file contents, etc). As an
+ // example, a Log implementation should not write to its logfile
+ // with an AccessController anywhere in the call stack, otherwise an
+ // insecure application could configure the log implementation to write
+ // to a protected file using the privileges granted to JCL rather than
+ // to the calling application.
+ //
+ // Under no circumstance should a non-private method return data that is
+ // retrieved via an AccessController. That would allow an insecure app
+ // to invoke that method and obtain data that it is not permitted to have.
+ //
+ // Invoking user-supplied code with an AccessController set is not a major
+ // issue (eg invoking the constructor of the class specified by
+ // HASHTABLE_IMPLEMENTATION_PROPERTY). That class will be in a different
+ // trust domain, and therefore must have permissions to do whatever it
+ // is trying to do regardless of the permissions granted to JCL. There is
+ // a slight issue in that untrusted code may point that environment var
+ // to another trusted library, in which case the code runs if both that
+ // lib and JCL have the necessary permissions even when the untrusted
+ // caller does not. That's a pretty hard route to exploit though.
+
+ // ----------------------------------------------------- Manifest Constants
+
+ /**
+ * The name ({@code priority}) of the key in the config file used to
+ * specify the priority of that particular config file. The associated value
+ * is a floating-point number; higher values take priority over lower values.
+ */
+ public static final String PRIORITY_KEY = "priority";
+
+ /**
+ * The name ({@code use_tccl}) of the key in the config file used
+ * to specify whether logging classes should be loaded via the thread
+ * context class loader (TCCL), or not. By default, the TCCL is used.
+ */
+ public static final String TCCL_KEY = "use_tccl";
+
+ /**
+ * The name ({@code org.apache.commons.logging.LogFactory}) of the property
+ * used to identify the LogFactory implementation
+ * class name. This can be used as a system property, or as an entry in a
+ * configuration properties file.
+ */
+ public static final String FACTORY_PROPERTY = "org.apache.commons.logging.LogFactory";
+
+ /**
+ * The fully qualified class name of the fallback {@code LogFactory}
+ * implementation class to use, if no other can be found.
+ */
+ public static final String FACTORY_DEFAULT = "org.apache.commons.logging.impl.LogFactoryImpl";
+
+ /**
+ * The name ({@code commons-logging.properties}) of the properties file to search for.
+ */
+ public static final String FACTORY_PROPERTIES = "commons-logging.properties";
+
+ /**
+ * JDK1.3+
+ * 'Service Provider' specification.
+ */
+ protected static final String SERVICE_ID =
+ "META-INF/services/org.apache.commons.logging.LogFactory";
+
+ /**
+ * The name ({@code org.apache.commons.logging.diagnostics.dest})
+ * of the property used to enable internal commons-logging
+ * diagnostic output, in order to get information on what logging
+ * implementations are being discovered, what classloaders they
+ * are loaded through, etc.
+ *
+ * If a system property of this name is set then the value is
+ * assumed to be the name of a file. The special strings
+ * STDOUT or STDERR (case-sensitive) indicate output to
+ * System.out and System.err respectively.
+ *
+ * Diagnostic logging should be used only to debug problematic
+ * configurations and should not be set in normal production use.
+ */
+ public static final String DIAGNOSTICS_DEST_PROPERTY =
+ "org.apache.commons.logging.diagnostics.dest";
+
+ /**
+ * When null (the usual case), no diagnostic output will be
+ * generated by LogFactory or LogFactoryImpl. When non-null,
+ * interesting events will be written to the specified object.
+ */
+ private static final PrintStream DIAGNOSTICS_STREAM;
+
+ /**
+ * A string that gets prefixed to every message output by the
+ * logDiagnostic method, so that users can clearly see which
+ * LogFactory class is generating the output.
+ */
+ private static final String diagnosticPrefix;
+
+ /**
+ * Setting this system property
+ * ({@code org.apache.commons.logging.LogFactory.HashtableImpl})
+ * value allows the {@code Hashtable} used to store
+ * classloaders to be substituted by an alternative implementation.
+ *
+ * Note: {@code LogFactory} will print:
+ *
+ * Usage: Set this property when Java is invoked
+ * and {@code LogFactory} will attempt to load a new instance
+ * of the given implementation class.
+ * For example, running the following ant scriplet:
+ *
+ * A typical use case is to allow a custom
+ * Hashtable implementation using weak references to be substituted.
+ * This will allow classloaders to be garbage collected without
+ * the need to release them (on 1.3+ JVMs only, of course ;).
+ */
+ public static final String HASHTABLE_IMPLEMENTATION_PROPERTY =
+ "org.apache.commons.logging.LogFactory.HashtableImpl";
+
+ /** Name used to load the weak hashtable implementation by names. */
+ private static final String WEAK_HASHTABLE_CLASSNAME =
+ "org.apache.commons.logging.impl.WeakHashtable";
+
+ /**
+ * A reference to the classloader that loaded this class. This is the
+ * same as LogFactory.class.getClassLoader(). However computing this
+ * value isn't quite as simple as that, as we potentially need to use
+ * AccessControllers etc. It's more efficient to compute it once and
+ * cache it here.
+ */
+ private static final WeakReference
+ * NOTE - Depending upon the implementation of
+ * the {@code LogFactory} you are using, the {@code Log}
+ * instance you are returned may or may not be local to the current
+ * application, and may or may not be returned again on a subsequent
+ * call with the same name argument.
+ *
+ * @param name Logical name of the {@code Log} instance to be
+ * returned (the meaning of this name is only known to the underlying
+ * logging implementation that is being wrapped)
+ * @throws LogConfigurationException if a suitable {@code Log}
+ * instance cannot be returned
+ */
+ public abstract Log getInstance(String name)
+ throws LogConfigurationException;
+
+ /**
+ * Release any internal references to previously created {@link Log}
+ * instances returned by this factory. This is useful in environments
+ * like servlet containers, which implement application reloading by
+ * throwing away a ClassLoader. Dangling references to objects in that
+ * class loader would prevent garbage collection.
+ */
+ public abstract void release();
+
+ /**
+ * Remove any configuration attribute associated with the specified name.
+ * If there is no such attribute, no action is taken.
+ *
+ * @param name Name of the attribute to remove
+ */
+ public abstract void removeAttribute(String name);
+
+ /**
+ * Set the configuration attribute with the specified name. Calling
+ * this with a {@code null} value is equivalent to calling
+ * {@code removeAttribute(name)}.
+ *
+ * @param name Name of the attribute to set
+ * @param value Value of the attribute to set, or {@code null}
+ * to remove any setting for this attribute
+ */
+ public abstract void setAttribute(String name, Object value);
+
+ // ------------------------------------------------------- Static Variables
+
+ /**
+ * The previously constructed {@code LogFactory} instances, keyed by
+ * the {@code ClassLoader} with which it was created.
+ */
+ protected static Hashtable factories;
+
+ /**
+ * Previously constructed {@code LogFactory} instance as in the
+ * {@code factories} map, but for the case where
+ * {@code getClassLoader} returns {@code null}.
+ * This can happen when:
+ *
+ * Note that the correct way to ensure no memory leaks occur is to ensure
+ * that LogFactory.release(contextClassLoader) is called whenever a
+ * webapp is undeployed.
+ */
+ private static final Hashtable createFactoryStore() {
+ Hashtable result = null;
+ String storeImplementationClass;
+ try {
+ storeImplementationClass = getSystemProperty(HASHTABLE_IMPLEMENTATION_PROPERTY, null);
+ } catch (final SecurityException ex) {
+ // Permissions don't allow this to be accessed. Default to the "modern"
+ // weak hashtable implementation if it is available.
+ storeImplementationClass = null;
+ }
+
+ if (storeImplementationClass == null) {
+ storeImplementationClass = WEAK_HASHTABLE_CLASSNAME;
+ }
+ try {
+ final Class implementationClass = Class.forName(storeImplementationClass);
+ result = (Hashtable) implementationClass.newInstance();
+ } catch (final Throwable t) {
+ handleThrowable(t); // may re-throw t
+
+ // ignore
+ if (!WEAK_HASHTABLE_CLASSNAME.equals(storeImplementationClass)) {
+ // if the user's trying to set up a custom implementation, give a clue
+ if (isDiagnosticsEnabled()) {
+ // use internal logging to issue the warning
+ logDiagnostic("[ERROR] LogFactory: Load of custom hashtable failed");
+ } else {
+ // we *really* want this output, even if diagnostics weren't
+ // explicitly enabled by the user.
+ System.err.println("[ERROR] LogFactory: Load of custom hashtable failed");
+ }
+ }
+ }
+ if (result == null) {
+ result = new Hashtable();
+ }
+ return result;
+ }
+
+ // --------------------------------------------------------- Static Methods
+
+ /** Utility method to safely trim a string. */
+ private static String trim(final String src) {
+ if (src == null) {
+ return null;
+ }
+ return src.trim();
+ }
+
+ /**
+ * Checks whether the supplied Throwable is one that needs to be
+ * re-thrown and ignores all others.
+ *
+ * The following errors are re-thrown:
+ *
+ *
+ * NOTE - If the properties file method of identifying the
+ * {@code LogFactory} implementation class is utilized, all of the
+ * properties defined in this file will be set as configuration attributes
+ * on the corresponding {@code LogFactory} instance.
+ *
+ * NOTE - In a multi-threaded environment it is possible
+ * that two different instances will be returned for the same
+ * classloader environment.
+ *
+ * @throws LogConfigurationException if the implementation class is not
+ * available or cannot be instantiated.
+ */
+ public static LogFactory getFactory() throws LogConfigurationException {
+ // Identify the class loader we will be using
+ final ClassLoader contextClassLoader = getContextClassLoaderInternal();
+
+
+ // This is an odd enough situation to report about. This
+ // output will be a nuisance on JDK1.1, as the system
+ // classloader is null in that environment.
+ if (contextClassLoader == null && isDiagnosticsEnabled()) {
+ logDiagnostic("Context classloader is null.");
+ }
+
+ // Return any previously registered factory for this class loader
+ LogFactory factory = getCachedFactory(contextClassLoader);
+ if (factory != null) {
+ return factory;
+ }
+
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic(
+ "[LOOKUP] LogFactory implementation requested for the first time for context classloader " +
+ objectId(contextClassLoader));
+ logHierarchy("[LOOKUP] ", contextClassLoader);
+ }
+
+ // Load properties file.
+ //
+ // If the properties file exists, then its contents are used as
+ // "attributes" on the LogFactory implementation class. One particular
+ // property may also control which LogFactory concrete subclass is
+ // used, but only if other discovery mechanisms fail..
+ //
+ // As the properties file (if it exists) will be used one way or
+ // another in the end we may as well look for it first.
+
+ final Properties props = getConfigurationFile(contextClassLoader, FACTORY_PROPERTIES);
+
+ // Determine whether we will be using the thread context class loader to
+ // load logging classes or not by checking the loaded properties file (if any).
+ ClassLoader baseClassLoader = contextClassLoader;
+ if (props != null) {
+ final String useTCCLStr = props.getProperty(TCCL_KEY);
+ // The Boolean.valueOf(useTCCLStr).booleanValue() formulation
+ // is required for Java 1.2 compatibility.
+ if ((useTCCLStr != null) && !Boolean.parseBoolean(useTCCLStr)) {
+ // Don't use current context classloader when locating any
+ // LogFactory or Log classes, just use the class that loaded
+ // this abstract class. When this class is deployed in a shared
+ // classpath of a container, it means webapps cannot deploy their
+ // own logging implementations. It also means that it is up to the
+ // implementation whether to load library-specific config files
+ // from the TCCL or not.
+ baseClassLoader = thisClassLoaderRef.get();
+ }
+ }
+
+ // Determine which concrete LogFactory subclass to use.
+ // First, try a global system property
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] Looking for system property [" + FACTORY_PROPERTY +
+ "] to define the LogFactory subclass to use...");
+ }
+
+ try {
+ final String factoryClass = getSystemProperty(FACTORY_PROPERTY, null);
+ if (factoryClass != null) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] Creating an instance of LogFactory class '" + factoryClass +
+ "' as specified by system property " + FACTORY_PROPERTY);
+ }
+ factory = newFactory(factoryClass, baseClassLoader, contextClassLoader);
+ } else {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] No system property [" + FACTORY_PROPERTY + "] defined.");
+ }
+ }
+ } catch (final SecurityException e) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] A security exception occurred while trying to create an" +
+ " instance of the custom factory class" + ": [" + trim(e.getMessage()) +
+ "]. Trying alternative implementations...");
+ }
+ // ignore
+ } catch (final RuntimeException e) {
+ // This is not consistent with the behavior when a bad LogFactory class is
+ // specified in a services file.
+ //
+ // One possible exception that can occur here is a ClassCastException when
+ // the specified class wasn't castable to this LogFactory type.
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] An exception occurred while trying to create an" +
+ " instance of the custom factory class" + ": [" +
+ trim(e.getMessage()) +
+ "] as specified by a system property.");
+ }
+ throw e;
+ }
+
+ // Second, try to find a service by using the JDK1.3 class
+ // discovery mechanism, which involves putting a file with the name
+ // of an interface class in the META-INF/services directory, where the
+ // contents of the file is a single line specifying a concrete class
+ // that implements the desired interface.
+
+ if (factory == null) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] Looking for a resource file of name [" + SERVICE_ID +
+ "] to define the LogFactory subclass to use...");
+ }
+ try {
+ final InputStream is = getResourceAsStream(contextClassLoader, SERVICE_ID);
+
+ if ( is != null ) {
+ // This code is needed by EBCDIC and other strange systems.
+ // It's a fix for bugs reported in xerces
+ BufferedReader rd;
+ try {
+ rd = new BufferedReader(new InputStreamReader(is, "UTF-8"));
+ } catch (final java.io.UnsupportedEncodingException e) {
+ rd = new BufferedReader(new InputStreamReader(is));
+ }
+
+ String factoryClassName;
+ try {
+ factoryClassName = rd.readLine();
+ } finally {
+ rd.close();
+ }
+
+ if (factoryClassName != null && ! factoryClassName.isEmpty()) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] Creating an instance of LogFactory class " +
+ factoryClassName +
+ " as specified by file '" + SERVICE_ID +
+ "' which was present in the path of the context classloader.");
+ }
+ factory = newFactory(factoryClassName, baseClassLoader, contextClassLoader );
+ }
+ } else {
+ // is == null
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] No resource file with name '" + SERVICE_ID + "' found.");
+ }
+ }
+ } catch (final Exception ex) {
+ // note: if the specified LogFactory class wasn't compatible with LogFactory
+ // for some reason, a ClassCastException will be caught here, and attempts will
+ // continue to find a compatible class.
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic(
+ "[LOOKUP] A security exception occurred while trying to create an" +
+ " instance of the custom factory class" +
+ ": [" + trim(ex.getMessage()) +
+ "]. Trying alternative implementations...");
+ }
+ // ignore
+ }
+ }
+
+ // Third try looking into the properties file read earlier (if found)
+
+ if (factory == null) {
+ if (props != null) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic(
+ "[LOOKUP] Looking in properties file for entry with key '" + FACTORY_PROPERTY +
+ "' to define the LogFactory subclass to use...");
+ }
+ final String factoryClass = props.getProperty(FACTORY_PROPERTY);
+ if (factoryClass != null) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic(
+ "[LOOKUP] Properties file specifies LogFactory subclass '" + factoryClass + "'");
+ }
+ factory = newFactory(factoryClass, baseClassLoader, contextClassLoader);
+
+ // TODO: think about whether we need to handle exceptions from newFactory
+ } else {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] Properties file has no entry specifying LogFactory subclass.");
+ }
+ }
+ } else {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] No properties file available to determine" + " LogFactory subclass from..");
+ }
+ }
+ }
+
+ // Fourth, try the fallback implementation class
+
+ if (factory == null) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic(
+ "[LOOKUP] Loading the default LogFactory implementation '" + FACTORY_DEFAULT +
+ "' via the same classloader that loaded this LogFactory" +
+ " class (ie not looking in the context classloader).");
+ }
+
+ // Note: unlike the above code which can try to load custom LogFactory
+ // implementations via the TCCL, we don't try to load the default LogFactory
+ // implementation via the context classloader because:
+ // * that can cause problems (see comments in newFactory method)
+ // * no-one should be customising the code of the default class
+ // Yes, we do give up the ability for the child to ship a newer
+ // version of the LogFactoryImpl class and have it used dynamically
+ // by an old LogFactory class in the parent, but that isn't
+ // necessarily a good idea anyway.
+ factory = newFactory(FACTORY_DEFAULT, thisClassLoaderRef.get(), contextClassLoader);
+ }
+
+ if (factory != null) {
+ /**
+ * Always cache using context class loader.
+ */
+ cacheFactory(contextClassLoader, factory);
+
+ if (props != null) {
+ final Enumeration names = props.propertyNames();
+ while (names.hasMoreElements()) {
+ final String name = (String) names.nextElement();
+ final String value = props.getProperty(name);
+ factory.setAttribute(name, value);
+ }
+ }
+ }
+
+ return factory;
+ }
+
+ /**
+ * Convenience method to return a named logger, without the application
+ * having to care about factories.
+ *
+ * @param clazz Class from which a log name will be derived
+ * @throws LogConfigurationException if a suitable {@code Log}
+ * instance cannot be returned
+ */
+ public static Log getLog(final Class clazz) throws LogConfigurationException {
+ return getFactory().getInstance(clazz);
+ }
+
+ /**
+ * Convenience method to return a named logger, without the application
+ * having to care about factories.
+ *
+ * @param name Logical name of the {@code Log} instance to be
+ * returned (the meaning of this name is only known to the underlying
+ * logging implementation that is being wrapped)
+ * @throws LogConfigurationException if a suitable {@code Log}
+ * instance cannot be returned
+ */
+ public static Log getLog(final String name) throws LogConfigurationException {
+ return getFactory().getInstance(name);
+ }
+
+ /**
+ * Release any internal references to previously created {@link LogFactory}
+ * instances that have been associated with the specified class loader
+ * (if any), after calling the instance method {@code release()} on
+ * each of them.
+ *
+ * @param classLoader ClassLoader for which to release the LogFactory
+ */
+ public static void release(final ClassLoader classLoader) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Releasing factory for classloader " + objectId(classLoader));
+ }
+ // factories is not final and could be replaced in this block.
+ final Hashtable factories = LogFactory.factories;
+ synchronized (factories) {
+ if (classLoader == null) {
+ if (nullClassLoaderFactory != null) {
+ nullClassLoaderFactory.release();
+ nullClassLoaderFactory = null;
+ }
+ } else {
+ final LogFactory factory = (LogFactory) factories.get(classLoader);
+ if (factory != null) {
+ factory.release();
+ factories.remove(classLoader);
+ }
+ }
+ }
+ }
+
+ /**
+ * Release any internal references to previously created {@link LogFactory}
+ * instances, after calling the instance method {@code release()} on
+ * each of them. This is useful in environments like servlet containers,
+ * which implement application reloading by throwing away a ClassLoader.
+ * Dangling references to objects in that class loader would prevent
+ * garbage collection.
+ */
+ public static void releaseAll() {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Releasing factory for all classloaders.");
+ }
+ // factories is not final and could be replaced in this block.
+ final Hashtable factories = LogFactory.factories;
+ synchronized (factories) {
+ final Enumeration elements = factories.elements();
+ while (elements.hasMoreElements()) {
+ final LogFactory element = (LogFactory) elements.nextElement();
+ element.release();
+ }
+ factories.clear();
+
+ if (nullClassLoaderFactory != null) {
+ nullClassLoaderFactory.release();
+ nullClassLoaderFactory = null;
+ }
+ }
+ }
+
+ // ------------------------------------------------------ Protected Methods
+
+ /**
+ * Safely get access to the classloader for the specified class.
+ *
+ * Theoretically, calling getClassLoader can throw a security exception,
+ * and so should be done under an AccessController in order to provide
+ * maximum flexibility. However in practice people don't appear to use
+ * security policies that forbid getClassLoader calls. So for the moment
+ * all code is written to call this method rather than Class.getClassLoader,
+ * so that we could put AccessController stuff in this method without any
+ * disruption later if we need to.
+ *
+ * Even when using an AccessController, however, this method can still
+ * throw SecurityException. Commons-logging basically relies on the
+ * ability to access classloaders, ie a policy that forbids all
+ * classloader access will also prevent commons-logging from working:
+ * currently this method will throw an exception preventing the entire app
+ * from starting up. Maybe it would be good to detect this situation and
+ * just disable all commons-logging? Not high priority though - as stated
+ * above, security policies that prevent classloader access aren't common.
+ *
+ * Note that returning an object fetched via an AccessController would
+ * technically be a security flaw anyway; untrusted code that has access
+ * to a trusted JCL library could use it to fetch the classloader for
+ * a class even when forbidden to do so directly.
+ *
+ * @since 1.1
+ */
+ protected static ClassLoader getClassLoader(final Class clazz) {
+ try {
+ return clazz.getClassLoader();
+ } catch (final SecurityException ex) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Unable to get classloader for class '" + clazz +
+ "' due to security restrictions - " + ex.getMessage());
+ }
+ throw ex;
+ }
+ }
+
+ /**
+ * Returns the current context classloader.
+ *
+ * In versions prior to 1.1, this method did not use an AccessController.
+ * In version 1.1, an AccessController wrapper was incorrectly added to
+ * this method, causing a minor security flaw.
+ *
+ * In version 1.1.1 this change was reverted; this method no longer uses
+ * an AccessController. User code wishing to obtain the context classloader
+ * must invoke this method via AccessController.doPrivileged if it needs
+ * support for that.
+ *
+ * @return the context classloader associated with the current thread,
+ * or null if security doesn't allow it.
+ * @throws LogConfigurationException if there was some weird error while
+ * attempting to get the context classloader.
+ */
+ protected static ClassLoader getContextClassLoader() throws LogConfigurationException {
+ return directGetContextClassLoader();
+ }
+
+ /**
+ * Calls LogFactory.directGetContextClassLoader under the control of an
+ * AccessController class. This means that java code running under a
+ * security manager that forbids access to ClassLoaders will still work
+ * if this class is given appropriate privileges, even when the caller
+ * doesn't have such privileges. Without using an AccessController, the
+ * the entire call stack must have the privilege before the call is
+ * allowed.
+ *
+ * @return the context classloader associated with the current thread,
+ * or null if security doesn't allow it.
+ * @throws LogConfigurationException if there was some weird error while
+ * attempting to get the context classloader.
+ */
+ private static ClassLoader getContextClassLoaderInternal() throws LogConfigurationException {
+ return (ClassLoader)AccessController.doPrivileged(
+ new PrivilegedAction() {
+ @Override
+ public Object run() {
+ return directGetContextClassLoader();
+ }
+ });
+ }
+
+ /**
+ * Return the thread context class loader if available; otherwise return null.
+ *
+ * Most/all code should call getContextClassLoaderInternal rather than
+ * calling this method directly.
+ *
+ * The thread context class loader is available for JDK 1.2
+ * or later, if certain security conditions are met.
+ *
+ * Note that no internal logging is done within this method because
+ * this method is called every time LogFactory.getLogger() is called,
+ * and we don't want too much output generated here.
+ *
+ * @throws LogConfigurationException if a suitable class loader
+ * cannot be identified.
+ * @return the thread's context classloader or {@code null} if the java security
+ * policy forbids access to the context classloader from one of the classes
+ * in the current call stack.
+ * @since 1.1
+ */
+ protected static ClassLoader directGetContextClassLoader() throws LogConfigurationException {
+ ClassLoader classLoader = null;
+
+ try {
+ classLoader = Thread.currentThread().getContextClassLoader();
+ } catch (final SecurityException ex) {
+ /**
+ * getContextClassLoader() throws SecurityException when
+ * the context class loader isn't an ancestor of the
+ * calling class's class loader, or if security
+ * permissions are restricted.
+ *
+ * We ignore this exception to be consistent with the previous
+ * behavior (e.g. 1.1.3 and earlier).
+ */
+ // ignore
+ }
+
+ // Return the selected class loader
+ return classLoader;
+ }
+
+ /**
+ * Check cached factories (keyed by contextClassLoader)
+ *
+ * @param contextClassLoader is the context classloader associated
+ * with the current thread. This allows separate LogFactory objects
+ * per component within a container, provided each component has
+ * a distinct context classloader set. This parameter may be null
+ * in JDK1.1, and in embedded systems where jcl-using code is
+ * placed in the bootclasspath.
+ *
+ * @return the factory associated with the specified classloader if
+ * one has previously been created, or null if this is the first time
+ * we have seen this particular classloader.
+ */
+ private static LogFactory getCachedFactory(final ClassLoader contextClassLoader) {
+ if (contextClassLoader == null) {
+ // We have to handle this specially, as factories is a Hashtable
+ // and those don't accept null as a key value.
+ //
+ // nb: nullClassLoaderFactory might be null. That's ok.
+ return nullClassLoaderFactory;
+ }
+ return (LogFactory) factories.get(contextClassLoader);
+ }
+
+ /**
+ * Remember this factory, so later calls to LogFactory.getCachedFactory
+ * can return the previously created object (together with all its
+ * cached Log objects).
+ *
+ * @param classLoader should be the current context classloader. Note that
+ * this can be null under some circumstances; this is ok.
+ * @param factory should be the factory to cache. This should never be null.
+ */
+ private static void cacheFactory(final ClassLoader classLoader, final LogFactory factory) {
+ // Ideally we would assert(factory != null) here. However reporting
+ // errors from within a logging implementation is a little tricky!
+
+ if (factory != null) {
+ if (classLoader == null) {
+ nullClassLoaderFactory = factory;
+ } else {
+ factories.put(classLoader, factory);
+ }
+ }
+ }
+
+ /**
+ * Return a new instance of the specified {@code LogFactory}
+ * implementation class, loaded by the specified class loader.
+ * If that fails, try the class loader used to load this
+ * (abstract) LogFactory.
+ *
+ * Note that there can be problems if the specified ClassLoader is not the
+ * same as the classloader that loaded this class, ie when loading a
+ * concrete LogFactory subclass via a context classloader.
+ *
+ * The problem is the same one that can occur when loading a concrete Log
+ * subclass via a context classloader.
+ *
+ * The problem occurs when code running in the context classloader calls
+ * class X which was loaded via a parent classloader, and class X then calls
+ * LogFactory.getFactory (either directly or via LogFactory.getLog). Because
+ * class X was loaded via the parent, it binds to LogFactory loaded via
+ * the parent. When the code in this method finds some LogFactoryYYYY
+ * class in the child (context) classloader, and there also happens to be a
+ * LogFactory class defined in the child classloader, then LogFactoryYYYY
+ * will be bound to LogFactory@childloader. It cannot be cast to
+ * LogFactory@parentloader, ie this method cannot return the object as
+ * the desired type. Note that it doesn't matter if the LogFactory class
+ * in the child classloader is identical to the LogFactory class in the
+ * parent classloader, they are not compatible.
+ *
+ * The solution taken here is to simply print out an error message when
+ * this occurs then throw an exception. The deployer of the application
+ * must ensure they remove all occurrences of the LogFactory class from
+ * the child classloader in order to resolve the issue. Note that they
+ * do not have to move the custom LogFactory subclass; that is ok as
+ * long as the only LogFactory class it can find to bind to is in the
+ * parent classloader.
+ *
+ * @param factoryClass Fully qualified name of the {@code LogFactory}
+ * implementation class
+ * @param classLoader ClassLoader from which to load this class
+ * @param contextClassLoader is the context that this new factory will
+ * manage logging for.
+ * @throws LogConfigurationException if a suitable instance
+ * cannot be created
+ * @since 1.1
+ */
+ protected static LogFactory newFactory(final String factoryClass,
+ final ClassLoader classLoader,
+ final ClassLoader contextClassLoader)
+ throws LogConfigurationException {
+ // Note that any unchecked exceptions thrown by the createFactory
+ // method will propagate out of this method; in particular a
+ // ClassCastException can be thrown.
+ final Object result = AccessController.doPrivileged(
+ new PrivilegedAction() {
+ @Override
+ public Object run() {
+ return createFactory(factoryClass, classLoader);
+ }
+ });
+
+ if (result instanceof LogConfigurationException) {
+ final LogConfigurationException ex = (LogConfigurationException) result;
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("An error occurred while loading the factory class:" + ex.getMessage());
+ }
+ throw ex;
+ }
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Created object " + objectId(result) + " to manage classloader " +
+ objectId(contextClassLoader));
+ }
+ return (LogFactory)result;
+ }
+
+ /**
+ * Method provided for backwards compatibility; see newFactory version that
+ * takes 3 parameters.
+ *
+ * This method would only ever be called in some rather odd situation.
+ * Note that this method is static, so overriding in a subclass doesn't
+ * have any effect unless this method is called from a method in that
+ * subclass. However this method only makes sense to use from the
+ * getFactory method, and as that is almost always invoked via
+ * LogFactory.getFactory, any custom definition in a subclass would be
+ * pointless. Only a class with a custom getFactory method, then invoked
+ * directly via CustomFactoryImpl.getFactory or similar would ever call
+ * this. Anyway, it's here just in case, though the "managed class loader"
+ * value output to the diagnostics will not report the correct value.
+ */
+ protected static LogFactory newFactory(final String factoryClass,
+ final ClassLoader classLoader) {
+ return newFactory(factoryClass, classLoader, null);
+ }
+
+ /**
+ * Implements the operations described in the javadoc for newFactory.
+ *
+ * @param factoryClass
+ * @param classLoader used to load the specified factory class. This is
+ * expected to be either the TCCL or the classloader which loaded this
+ * class. Note that the classloader which loaded this class might be
+ * "null" (ie the bootloader) for embedded systems.
+ * @return either a LogFactory object or a LogConfigurationException object.
+ * @since 1.1
+ */
+ protected static Object createFactory(final String factoryClass, final ClassLoader classLoader) {
+ // This will be used to diagnose bad configurations
+ // and allow a useful message to be sent to the user
+ Class logFactoryClass = null;
+ try {
+ if (classLoader != null) {
+ try {
+ // First the given class loader param (thread class loader)
+
+ // Warning: must typecast here & allow exception
+ // to be generated/caught & recast properly.
+ logFactoryClass = classLoader.loadClass(factoryClass);
+ if (LogFactory.class.isAssignableFrom(logFactoryClass)) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Loaded class " + logFactoryClass.getName() +
+ " from classloader " + objectId(classLoader));
+ }
+ } else {
+ //
+ // This indicates a problem with the ClassLoader tree.
+ // An incompatible ClassLoader was used to load the
+ // implementation.
+ // As the same classes
+ // must be available in multiple class loaders,
+ // it is very likely that multiple JCL jars are present.
+ // The most likely fix for this
+ // problem is to remove the extra JCL jars from the
+ // ClassLoader hierarchy.
+ //
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Factory class " + logFactoryClass.getName() +
+ " loaded from classloader " + objectId(logFactoryClass.getClassLoader()) +
+ " does not extend '" + LogFactory.class.getName() +
+ "' as loaded by this classloader.");
+ logHierarchy("[BAD CL TREE] ", classLoader);
+ }
+ }
+
+ return (LogFactory) logFactoryClass.newInstance();
+
+ } catch (final ClassNotFoundException ex) {
+ if (classLoader == thisClassLoaderRef.get()) {
+ // Nothing more to try, onwards.
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Unable to locate any class called '" + factoryClass +
+ "' via classloader " + objectId(classLoader));
+ }
+ throw ex;
+ }
+ // ignore exception, continue
+ } catch (final NoClassDefFoundError e) {
+ if (classLoader == thisClassLoaderRef.get()) {
+ // Nothing more to try, onwards.
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Class '" + factoryClass + "' cannot be loaded" +
+ " via classloader " + objectId(classLoader) +
+ " - it depends on some other class that cannot be found.");
+ }
+ throw e;
+ }
+ // ignore exception, continue
+ } catch (final ClassCastException e) {
+ if (classLoader == thisClassLoaderRef.get()) {
+ // There's no point in falling through to the code below that
+ // tries again with thisClassLoaderRef, because we've just tried
+ // loading with that loader (not the TCCL). Just throw an
+ // appropriate exception here.
+
+ final boolean implementsLogFactory = implementsLogFactory(logFactoryClass);
+
+ //
+ // Construct a good message: users may not actual expect that a custom implementation
+ // has been specified. Several well known containers use this mechanism to adapt JCL
+ // to their native logging system.
+ //
+ final StringBuilder msg = new StringBuilder();
+ msg.append("The application has specified that a custom LogFactory implementation ");
+ msg.append("should be used but Class '");
+ msg.append(factoryClass);
+ msg.append("' cannot be converted to '");
+ msg.append(LogFactory.class.getName());
+ msg.append("'. ");
+ if (implementsLogFactory) {
+ msg.append("The conflict is caused by the presence of multiple LogFactory classes ");
+ msg.append("in incompatible classloaders. ");
+ msg.append("Background can be found in http://commons.apache.org/logging/tech.html. ");
+ msg.append("If you have not explicitly specified a custom LogFactory then it is likely ");
+ msg.append("that the container has set one without your knowledge. ");
+ msg.append("In this case, consider using the commons-logging-adapters.jar file or ");
+ msg.append("specifying the standard LogFactory from the command line. ");
+ } else {
+ msg.append("Please check the custom implementation. ");
+ }
+ msg.append("Help can be found @http://commons.apache.org/logging/troubleshooting.html.");
+
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic(msg.toString());
+ }
+
+ throw new ClassCastException(msg.toString());
+ }
+
+ // Ignore exception, continue. Presumably the classloader was the
+ // TCCL; the code below will try to load the class via thisClassLoaderRef.
+ // This will handle the case where the original calling class is in
+ // a shared classpath but the TCCL has a copy of LogFactory and the
+ // specified LogFactory implementation; we will fall back to using the
+ // LogFactory implementation from the same classloader as this class.
+ //
+ // Issue: this doesn't handle the reverse case, where this LogFactory
+ // is in the webapp, and the specified LogFactory implementation is
+ // in a shared classpath. In that case:
+ // (a) the class really does implement LogFactory (bad log msg above)
+ // (b) the fallback code will result in exactly the same problem.
+ }
+ }
+
+ /* At this point, either classLoader == null, OR
+ * classLoader was unable to load factoryClass.
+ *
+ * In either case, we call Class.forName, which is equivalent
+ * to LogFactory.class.getClassLoader().load(name), ie we ignore
+ * the classloader parameter the caller passed, and fall back
+ * to trying the classloader associated with this class. See the
+ * javadoc for the newFactory method for more info on the
+ * consequences of this.
+ *
+ * Notes:
+ * * LogFactory.class.getClassLoader() may return 'null'
+ * if LogFactory is loaded by the bootstrap classloader.
+ */
+ // Warning: must typecast here & allow exception
+ // to be generated/caught & recast properly.
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Unable to load factory class via classloader " + objectId(classLoader) +
+ " - trying the classloader associated with this LogFactory.");
+ }
+ logFactoryClass = Class.forName(factoryClass);
+ return (LogFactory) logFactoryClass.newInstance();
+ } catch (final Exception e) {
+ // Check to see if we've got a bad configuration
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Unable to create LogFactory instance.");
+ }
+ if (logFactoryClass != null && !LogFactory.class.isAssignableFrom(logFactoryClass)) {
+ return new LogConfigurationException(
+ "The chosen LogFactory implementation does not extend LogFactory." +
+ " Please check your configuration.", e);
+ }
+ return new LogConfigurationException(e);
+ }
+ }
+
+ /**
+ * Determines whether the given class actually implements {@code LogFactory}.
+ * Diagnostic information is also logged.
+ *
+ * Usage: to diagnose whether a classloader conflict is the cause
+ * of incompatibility. The test used is whether the class is assignable from
+ * the {@code LogFactory} class loaded by the class's classloader.
+ * @param logFactoryClass {@code Class} which may implement {@code LogFactory}
+ * @return true if the {@code logFactoryClass} does extend
+ * {@code LogFactory} when that class is loaded via the same
+ * classloader that loaded the {@code logFactoryClass}.
+ */
+ private static boolean implementsLogFactory(final Class logFactoryClass) {
+ boolean implementsLogFactory = false;
+ if (logFactoryClass != null) {
+ try {
+ final ClassLoader logFactoryClassLoader = logFactoryClass.getClassLoader();
+ if (logFactoryClassLoader == null) {
+ logDiagnostic("[CUSTOM LOG FACTORY] was loaded by the boot classloader");
+ } else {
+ logHierarchy("[CUSTOM LOG FACTORY] ", logFactoryClassLoader);
+ final Class factoryFromCustomLoader
+ = Class.forName("org.apache.commons.logging.LogFactory", false, logFactoryClassLoader);
+ implementsLogFactory = factoryFromCustomLoader.isAssignableFrom(logFactoryClass);
+ if (implementsLogFactory) {
+ logDiagnostic("[CUSTOM LOG FACTORY] " + logFactoryClass.getName() +
+ " implements LogFactory but was loaded by an incompatible classloader.");
+ } else {
+ logDiagnostic("[CUSTOM LOG FACTORY] " + logFactoryClass.getName() +
+ " does not implement LogFactory.");
+ }
+ }
+ } catch (final SecurityException e) {
+ //
+ // The application is running within a hostile security environment.
+ // This will make it very hard to diagnose issues with JCL.
+ // Consider running less securely whilst debugging this issue.
+ //
+ logDiagnostic("[CUSTOM LOG FACTORY] SecurityException thrown whilst trying to determine whether " +
+ "the compatibility was caused by a classloader conflict: " + e.getMessage());
+ } catch (final LinkageError e) {
+ //
+ // This should be an unusual circumstance.
+ // LinkageError's usually indicate that a dependent class has incompatibly changed.
+ // Another possibility may be an exception thrown by an initializer.
+ // Time for a clean rebuild?
+ //
+ logDiagnostic("[CUSTOM LOG FACTORY] LinkageError thrown whilst trying to determine whether " +
+ "the compatibility was caused by a classloader conflict: " + e.getMessage());
+ } catch (final ClassNotFoundException e) {
+ //
+ // LogFactory cannot be loaded by the classloader which loaded the custom factory implementation.
+ // The custom implementation is not viable until this is corrected.
+ // Ensure that the JCL jar and the custom class are available from the same classloader.
+ // Running with diagnostics on should give information about the classloaders used
+ // to load the custom factory.
+ //
+ logDiagnostic("[CUSTOM LOG FACTORY] LogFactory class cannot be loaded by classloader which loaded " +
+ "the custom LogFactory implementation. Is the custom factory in the right classloader?");
+ }
+ }
+ return implementsLogFactory;
+ }
+
+ /**
+ * Applets may run in an environment where accessing resources of a loader is
+ * a secure operation, but where the commons-logging library has explicitly
+ * been granted permission for that operation. In this case, we need to
+ * run the operation using an AccessController.
+ */
+ private static InputStream getResourceAsStream(final ClassLoader loader, final String name) {
+ return (InputStream)AccessController.doPrivileged(
+ new PrivilegedAction() {
+ @Override
+ public Object run() {
+ if (loader != null) {
+ return loader.getResourceAsStream(name);
+ }
+ return ClassLoader.getSystemResourceAsStream(name);
+ }
+ });
+ }
+
+ /**
+ * Given a filename, return an enumeration of URLs pointing to
+ * all the occurrences of that filename in the classpath.
+ *
+ * This is just like ClassLoader.getResources except that the
+ * operation is done under an AccessController so that this method will
+ * succeed when this jarfile is privileged but the caller is not.
+ * This method must therefore remain private to avoid security issues.
+ *
+ * If no instances are found, an Enumeration is returned whose
+ * hasMoreElements method returns false (ie an "empty" enumeration).
+ * If resources could not be listed for some reason, null is returned.
+ */
+ private static Enumeration getResources(final ClassLoader loader, final String name) {
+ final PrivilegedAction action =
+ new PrivilegedAction() {
+ @Override
+ public Object run() {
+ try {
+ if (loader != null) {
+ return loader.getResources(name);
+ }
+ return ClassLoader.getSystemResources(name);
+ } catch (final IOException e) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Exception while trying to find configuration file " +
+ name + ":" + e.getMessage());
+ }
+ return null;
+ } catch (final NoSuchMethodError e) {
+ // we must be running on a 1.1 JVM which doesn't support
+ // ClassLoader.getSystemResources; just return null in
+ // this case.
+ return null;
+ }
+ }
+ };
+ final Object result = AccessController.doPrivileged(action);
+ return (Enumeration) result;
+ }
+
+ /**
+ * Given a URL that refers to a .properties file, load that file.
+ * This is done under an AccessController so that this method will
+ * succeed when this jarfile is privileged but the caller is not.
+ * This method must therefore remain private to avoid security issues.
+ *
+ * {@code Null} is returned if the URL cannot be opened.
+ */
+ private static Properties getProperties(final URL url) {
+ final PrivilegedAction action =
+ new PrivilegedAction() {
+ @Override
+ public Object run() {
+ InputStream stream = null;
+ try {
+ // We must ensure that useCaches is set to false, as the
+ // default behavior of java is to cache file handles, and
+ // this "locks" files, preventing hot-redeploy on windows.
+ final URLConnection connection = url.openConnection();
+ connection.setUseCaches(false);
+ stream = connection.getInputStream();
+ if (stream != null) {
+ final Properties props = new Properties();
+ props.load(stream);
+ stream.close();
+ stream = null;
+ return props;
+ }
+ } catch (final IOException e) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Unable to read URL " + url);
+ }
+ } finally {
+ if (stream != null) {
+ try {
+ stream.close();
+ } catch (final IOException e) {
+ // ignore exception; this should not happen
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("Unable to close stream for URL " + url);
+ }
+ }
+ }
+ }
+
+ return null;
+ }
+ };
+ return (Properties) AccessController.doPrivileged(action);
+ }
+
+ /**
+ * Locate a user-provided configuration file.
+ *
+ * The classpath of the specified classLoader (usually the context classloader)
+ * is searched for properties files of the specified name. If none is found,
+ * null is returned. If more than one is found, then the file with the greatest
+ * value for its PRIORITY property is returned. If multiple files have the
+ * same PRIORITY value then the first in the classpath is returned.
+ *
+ * This differs from the 1.0.x releases; those always use the first one found.
+ * However as the priority is a new field, this change is backwards compatible.
+ *
+ * The purpose of the priority field is to allow a webserver administrator to
+ * override logging settings in all webapps by placing a commons-logging.properties
+ * file in a shared classpath location with a priority > 0; this overrides any
+ * commons-logging.properties files without priorities which are in the
+ * webapps. Webapps can also use explicit priorities to override a configuration
+ * file in the shared classpath if needed.
+ */
+ private static final Properties getConfigurationFile(final ClassLoader classLoader, final String fileName) {
+ Properties props = null;
+ double priority = 0.0;
+ URL propsUrl = null;
+ try {
+ final Enumeration urls = getResources(classLoader, fileName);
+
+ if (urls == null) {
+ return null;
+ }
+
+ while (urls.hasMoreElements()) {
+ final URL url = (URL) urls.nextElement();
+
+ final Properties newProps = getProperties(url);
+ if (newProps != null) {
+ if (props == null) {
+ propsUrl = url;
+ props = newProps;
+ final String priorityStr = props.getProperty(PRIORITY_KEY);
+ priority = 0.0;
+ if (priorityStr != null) {
+ priority = Double.parseDouble(priorityStr);
+ }
+
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] Properties file found at '" + url + "'" +
+ " with priority " + priority);
+ }
+ } else {
+ final String newPriorityStr = newProps.getProperty(PRIORITY_KEY);
+ double newPriority = 0.0;
+ if (newPriorityStr != null) {
+ newPriority = Double.parseDouble(newPriorityStr);
+ }
+
+ if (newPriority > priority) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] Properties file at '" + url + "'" +
+ " with priority " + newPriority +
+ " overrides file at '" + propsUrl + "'" +
+ " with priority " + priority);
+ }
+
+ propsUrl = url;
+ props = newProps;
+ priority = newPriority;
+ } else {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("[LOOKUP] Properties file at '" + url + "'" +
+ " with priority " + newPriority +
+ " does not override file at '" + propsUrl + "'" +
+ " with priority " + priority);
+ }
+ }
+ }
+
+ }
+ }
+ } catch (final SecurityException e) {
+ if (isDiagnosticsEnabled()) {
+ logDiagnostic("SecurityException thrown while trying to find/read config files.");
+ }
+ }
+
+ if (isDiagnosticsEnabled()) {
+ if (props == null) {
+ logDiagnostic("[LOOKUP] No properties file of name '" + fileName + "' found.");
+ } else {
+ logDiagnostic("[LOOKUP] Properties file of name '" + fileName + "' found at '" + propsUrl + '"');
+ }
+ }
+
+ return props;
+ }
+
+ /**
+ * Read the specified system property, using an AccessController so that
+ * the property can be read if JCL has been granted the appropriate
+ * security rights even if the calling code has not.
+ *
+ * Take care not to expose the value returned by this method to the
+ * calling application in any way; otherwise the calling app can use that
+ * info to access data that should not be available to it.
+ */
+ private static String getSystemProperty(final String key, final String def)
+ throws SecurityException {
+ return (String) AccessController.doPrivileged(
+ new PrivilegedAction() {
+ @Override
+ public Object run() {
+ return System.getProperty(key, def);
+ }
+ });
+ }
+
+ /**
+ * Determines whether the user wants internal diagnostic output. If so,
+ * returns an appropriate writer object. Users can enable diagnostic
+ * output by setting the system property named {@link #DIAGNOSTICS_DEST_PROPERTY} to
+ * a filename, or the special values STDOUT or STDERR.
+ */
+ private static PrintStream initDiagnostics() {
+ String dest;
+ try {
+ dest = getSystemProperty(DIAGNOSTICS_DEST_PROPERTY, null);
+ if (dest == null) {
+ return null;
+ }
+ } catch (final SecurityException ex) {
+ // We must be running in some very secure environment.
+ // We just have to assume output is not wanted..
+ return null;
+ }
+
+ if (dest.equals("STDOUT")) {
+ return System.out;
+ }
+ if (dest.equals("STDERR")) {
+ return System.err;
+ }
+ try {
+ // open the file in append mode
+ final FileOutputStream fos = new FileOutputStream(dest, true);
+ return new PrintStream(fos);
+ } catch (final IOException ex) {
+ // We should report this to the user - but how?
+ return null;
+ }
+ }
+
+ /**
+ * Indicates true if the user has enabled internal logging.
+ *
+ * By the way, sorry for the incorrect grammar, but calling this method
+ * areDiagnosticsEnabled just isn't java beans style.
+ *
+ * @return true if calls to logDiagnostic will have any effect.
+ * @since 1.1
+ */
+ protected static boolean isDiagnosticsEnabled() {
+ return DIAGNOSTICS_STREAM != null;
+ }
+
+ /**
+ * Write the specified message to the internal logging destination.
+ *
+ * Note that this method is private; concrete subclasses of this class
+ * should not call it because the diagnosticPrefix string this
+ * method puts in front of all its messages is LogFactory@....,
+ * while subclasses should put SomeSubClass@...
+ *
+ * Subclasses should instead compute their own prefix, then call
+ * logRawDiagnostic. Note that calling isDiagnosticsEnabled is
+ * fine for subclasses.
+ *
+ * Note that it is safe to call this method before initDiagnostics
+ * is called; any output will just be ignored (as isDiagnosticsEnabled
+ * will return false).
+ *
+ * @param msg is the diagnostic message to be output.
+ */
+ private static final void logDiagnostic(final String msg) {
+ if (DIAGNOSTICS_STREAM != null) {
+ DIAGNOSTICS_STREAM.print(diagnosticPrefix);
+ DIAGNOSTICS_STREAM.println(msg);
+ DIAGNOSTICS_STREAM.flush();
+ }
+ }
+
+ /**
+ * Write the specified message to the internal logging destination.
+ *
+ * @param msg is the diagnostic message to be output.
+ * @since 1.1
+ */
+ protected static final void logRawDiagnostic(final String msg) {
+ if (DIAGNOSTICS_STREAM != null) {
+ DIAGNOSTICS_STREAM.println(msg);
+ DIAGNOSTICS_STREAM.flush();
+ }
+ }
+
+ /**
+ * Generate useful diagnostics regarding the classloader tree for
+ * the specified class.
+ *
+ * As an example, if the specified class was loaded via a webapp's
+ * classloader, then you may get the following output:
+ *
+ * This method returns immediately if isDiagnosticsEnabled()
+ * returns false.
+ *
+ * @param clazz is the class whose classloader + tree are to be
+ * output.
+ */
+ private static void logClassLoaderEnvironment(final Class clazz) {
+ if (!isDiagnosticsEnabled()) {
+ return;
+ }
+
+ try {
+ // Deliberately use System.getProperty here instead of getSystemProperty; if
+ // the overall security policy for the calling application forbids access to
+ // these variables then we do not want to output them to the diagnostic stream.
+ logDiagnostic("[ENV] Extension directories (java.ext.dir): " + System.getProperty("java.ext.dir"));
+ logDiagnostic("[ENV] Application classpath (java.class.path): " + System.getProperty("java.class.path"));
+ } catch (final SecurityException ex) {
+ logDiagnostic("[ENV] Security setting prevent interrogation of system classpaths.");
+ }
+
+ final String className = clazz.getName();
+ ClassLoader classLoader;
+
+ try {
+ classLoader = getClassLoader(clazz);
+ } catch (final SecurityException ex) {
+ // not much useful diagnostics we can print here!
+ logDiagnostic("[ENV] Security forbids determining the classloader for " + className);
+ return;
+ }
+
+ logDiagnostic("[ENV] Class " + className + " was loaded via classloader " + objectId(classLoader));
+ logHierarchy("[ENV] Ancestry of classloader which loaded " + className + " is ", classLoader);
+ }
+
+ /**
+ * Logs diagnostic messages about the given classloader
+ * and it's hierarchy. The prefix is prepended to the message
+ * and is intended to make it easier to understand the logs.
+ * @param prefix
+ * @param classLoader
+ */
+ private static void logHierarchy(final String prefix, ClassLoader classLoader) {
+ if (!isDiagnosticsEnabled()) {
+ return;
+ }
+ ClassLoader systemClassLoader;
+ if (classLoader != null) {
+ final String classLoaderString = classLoader.toString();
+ logDiagnostic(prefix + objectId(classLoader) + " == '" + classLoaderString + "'");
+ }
+
+ try {
+ systemClassLoader = ClassLoader.getSystemClassLoader();
+ } catch (final SecurityException ex) {
+ logDiagnostic(prefix + "Security forbids determining the system classloader.");
+ return;
+ }
+ if (classLoader != null) {
+ final StringBuilder buf = new StringBuilder(prefix + "ClassLoader tree:");
+ for(;;) {
+ buf.append(objectId(classLoader));
+ if (classLoader == systemClassLoader) {
+ buf.append(" (SYSTEM) ");
+ }
+
+ try {
+ classLoader = classLoader.getParent();
+ } catch (final SecurityException ex) {
+ buf.append(" --> SECRET");
+ break;
+ }
+
+ buf.append(" --> ");
+ if (classLoader == null) {
+ buf.append("BOOT");
+ break;
+ }
+ }
+ logDiagnostic(buf.toString());
+ }
+ }
+
+ /**
+ * Returns a string that uniquely identifies the specified object, including
+ * its class.
+ *
+ * The returned string is of form "classname@hashCode", ie is the same as
+ * the return value of the Object.toString() method, but works even when
+ * the specified object's class has overidden the toString method.
+ *
+ * @param o may be null.
+ * @return a string of form classname@hashCode, or "null" if param o is null.
+ * @since 1.1
+ */
+ public static String objectId(final Object o) {
+ if (o == null) {
+ return "null";
+ }
+ return o.getClass().getName() + "@" + System.identityHashCode(o);
+ }
+
+ // ----------------------------------------------------------------------
+ // Static initializer block to perform initialization at class load time.
+ //
+ // We can't do this in the class constructor, as there are many
+ // static methods on this class that can be called before any
+ // LogFactory instances are created, and they depend upon this
+ // stuff having been set up.
+ //
+ // Note that this block must come after any variable declarations used
+ // by any methods called from this block, as we want any static initializer
+ // associated with the variable to run first. If static initializers for
+ // variables run after this code, then (a) their value might be needed
+ // by methods called from here, and (b) they might *override* any value
+ // computed here!
+ //
+ // So the wisest thing to do is just to place this code at the very end
+ // of the class file.
+ // ----------------------------------------------------------------------
+
+ static {
+ // note: it's safe to call methods before initDiagnostics (though
+ // diagnostic output gets discarded).
+ ClassLoader thisClassLoader = getClassLoader(LogFactory.class);
+ thisClassLoaderRef = new WeakReference
- * When asked to load a class that is in one of the LOG_PCKG packages,
- * it loads the class itself (child-first). This class doesn't need
- * to be set up with a classpath, as it simply uses the same classpath
- * as the classloader that loaded it.
- */
- static class AppClassLoader extends ClassLoader {
-
- java.util.Map classes = new java.util.HashMap();
-
- AppClassLoader(final ClassLoader parent) {
- super(parent);
- }
-
- private Class def(final String name) throws ClassNotFoundException {
-
- Class result = (Class) classes.get(name);
- if (result != null) {
- return result;
- }
-
- try {
-
- final ClassLoader cl = this.getClass().getClassLoader();
- final String classFileName = name.replace('.', '/') + ".class";
- final java.io.InputStream is = cl.getResourceAsStream(classFileName);
- final java.io.ByteArrayOutputStream out = new java.io.ByteArrayOutputStream();
-
- while (is.available() > 0) {
- out.write(is.read());
- }
-
- final byte[] data = out.toByteArray();
-
- result = super.defineClass(name, data, 0, data.length);
- classes.put(name, result);
-
- return result;
-
- } catch (final java.io.IOException ioe) {
-
- throw new ClassNotFoundException(name + " caused by " + ioe.getMessage());
- }
-
- }
-
- // not very trivial to emulate we must implement "findClass",
- // but it will delegate to JUnit class loader first
- @Override
- public Class loadClass(final String name) throws ClassNotFoundException {
-
- // isolates all logging classes, application in the same classloader too.
- // filters exceptions to simplify handling in test
- for (final String element : LOG_PCKG) {
- if (name.startsWith(element) && name.indexOf("Exception") == -1) {
- return def(name);
- }
- }
- return super.loadClass(name);
- }
-
- }
-
-
- /**
- * Call the static setAllowFlawedContext method on the specified class
- * (expected to be a UserClass loaded via a custom classloader), passing
- * it the specified state parameter.
- */
- private void setAllowFlawedContext(final Class c, final String state) throws Exception {
- final Class[] params = {String.class};
- final java.lang.reflect.Method m = c.getDeclaredMethod("setAllowFlawedContext", params);
- m.invoke(null, state);
- }
-
- /**
- * Test what happens when we play various classloader tricks like those
- * that happen in web and j2ee containers.
- *
- * Note that this test assumes that commons-logging.jar and log4j.jar
- * are available via the system classpath.
- */
- public void testInContainer()throws Exception{
-
- //problem can be in this step (broken app container or missconfiguration)
- //1. Thread.currentThread().setContextClassLoader(ClassLoader.getSystemClassLoader());
- //2. Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());
- // we expect this :
- // 1. Thread.currentThread().setContextClassLoader(appLoader);
- // 2. Thread.currentThread().setContextClassLoader(null);
-
- // Context classloader is same as class calling into log
- Class cls = reload();
- Thread.currentThread().setContextClassLoader(cls.getClassLoader());
- execute(cls);
-
- // Context classloader is the "bootclassloader". This is technically
- // bad, but LogFactoryImpl.ALLOW_FLAWED_CONTEXT defaults to true so
- // this test should pass.
- cls = reload();
- Thread.currentThread().setContextClassLoader(null);
- execute(cls);
-
- // Context classloader is the "bootclassloader". This is same as above
- // except that ALLOW_FLAWED_CONTEXT is set to false; an error should
- // now be reported.
- cls = reload();
- Thread.currentThread().setContextClassLoader(null);
- try {
- setAllowFlawedContext(cls, "false");
- execute(cls);
- fail("Logging config succeeded when context classloader was null!");
- } catch (final LogConfigurationException ex) {
- // expected; the boot classloader doesn't *have* JCL available
- }
-
- // Context classloader is the system classloader.
- //
- // This is expected to cause problems, as LogFactoryImpl will attempt
- // to use the system classloader to load the Log4JLogger class, which
- // will then be unable to cast that object to the Log interface loaded
- // via the child classloader. However as ALLOW_FLAWED_CONTEXT defaults
- // to true this test should pass.
- cls = reload();
- Thread.currentThread().setContextClassLoader(ClassLoader.getSystemClassLoader());
- execute(cls);
-
- // Context classloader is the system classloader. This is the same
- // as above except that ALLOW_FLAWED_CONTEXT is set to false; an error
- // should now be reported.
- cls = reload();
- Thread.currentThread().setContextClassLoader(ClassLoader.getSystemClassLoader());
- try {
- setAllowFlawedContext(cls, "false");
- execute(cls);
- fail("Error: somehow downcast a Logger loaded via system classloader"
- + " to the Log interface loaded via a custom classloader");
- } catch (final LogConfigurationException ex) {
- // expected
- }
- }
-
- /**
- * Load class UserClass via a temporary classloader which is a child of
- * the classloader used to load this test class.
- */
- private Class reload() throws Exception {
- Class testObjCls = null;
- final AppClassLoader appLoader = new AppClassLoader(this.getClass().getClassLoader());
- try {
-
- testObjCls = appLoader.loadClass(UserClass.class.getName());
-
- } catch (final ClassNotFoundException cnfe) {
- throw cnfe;
- } catch (final Throwable t) {
- t.printStackTrace();
- fail("AppClassLoader failed ");
- }
-
- assertSame("app isolated", testObjCls.getClassLoader(), appLoader);
-
- return testObjCls;
-
- }
-
-
- private void execute(final Class cls) throws Exception {
- cls.newInstance();
- }
-
- @Override
- public void setUp() {
- // save state before test starts so we can restore it when test ends
- origContextClassLoader = Thread.currentThread().getContextClassLoader();
- }
-
- @Override
- public void tearDown() {
- // restore original state so a test can't stuff up later tests.
- Thread.currentThread().setContextClassLoader(origContextClassLoader);
- }
-
- private ClassLoader origContextClassLoader;
-}
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.logging;
+
+import junit.framework.TestCase;
+
+/**
+ * test to emulate container and application isolated from container
+ */
+public class LoadTestCase extends TestCase{
+ //TODO: need some way to add service provider packages
+ static private String[] LOG_PCKG = {"org.apache.commons.logging",
+ "org.apache.commons.logging.impl"};
+
+ /**
+ * A custom classloader which "duplicates" logging classes available
+ * in the parent classloader into itself.
+ *
+ * When asked to load a class that is in one of the LOG_PCKG packages,
+ * it loads the class itself (child-first). This class doesn't need
+ * to be set up with a classpath, as it simply uses the same classpath
+ * as the classloader that loaded it.
+ */
+ static class AppClassLoader extends ClassLoader {
+
+ java.util.Map classes = new java.util.HashMap();
+
+ AppClassLoader(final ClassLoader parent) {
+ super(parent);
+ }
+
+ private Class def(final String name) throws ClassNotFoundException {
+
+ Class result = (Class) classes.get(name);
+ if (result != null) {
+ return result;
+ }
+
+ try {
+
+ final ClassLoader cl = this.getClass().getClassLoader();
+ final String classFileName = name.replace('.', '/') + ".class";
+ final java.io.InputStream is = cl.getResourceAsStream(classFileName);
+ final java.io.ByteArrayOutputStream out = new java.io.ByteArrayOutputStream();
+
+ while (is.available() > 0) {
+ out.write(is.read());
+ }
+
+ final byte[] data = out.toByteArray();
+
+ result = super.defineClass(name, data, 0, data.length);
+ classes.put(name, result);
+
+ return result;
+
+ } catch (final java.io.IOException ioe) {
+
+ throw new ClassNotFoundException(name + " caused by " + ioe.getMessage());
+ }
+
+ }
+
+ // not very trivial to emulate we must implement "findClass",
+ // but it will delegate to JUnit class loader first
+ @Override
+ public Class loadClass(final String name) throws ClassNotFoundException {
+
+ // isolates all logging classes, application in the same classloader too.
+ // filters exceptions to simplify handling in test
+ for (final String element : LOG_PCKG) {
+ if (name.startsWith(element) && name.indexOf("Exception") == -1) {
+ return def(name);
+ }
+ }
+ return super.loadClass(name);
+ }
+
+ }
+
+
+ /**
+ * Call the static setAllowFlawedContext method on the specified class
+ * (expected to be a UserClass loaded via a custom classloader), passing
+ * it the specified state parameter.
+ */
+ private void setAllowFlawedContext(final Class c, final String state) throws Exception {
+ final Class[] params = {String.class};
+ final java.lang.reflect.Method m = c.getDeclaredMethod("setAllowFlawedContext", params);
+ m.invoke(null, state);
+ }
+
+ /**
+ * Test what happens when we play various classloader tricks like those
+ * that happen in web and j2ee containers.
+ *
+ * Note that this test assumes that commons-logging.jar and log4j.jar
+ * are available via the system classpath.
+ */
+ public void testInContainer()throws Exception{
+
+ //problem can be in this step (broken app container or missconfiguration)
+ //1. Thread.currentThread().setContextClassLoader(ClassLoader.getSystemClassLoader());
+ //2. Thread.currentThread().setContextClassLoader(this.getClass().getClassLoader());
+ // we expect this :
+ // 1. Thread.currentThread().setContextClassLoader(appLoader);
+ // 2. Thread.currentThread().setContextClassLoader(null);
+
+ // Context classloader is same as class calling into log
+ Class cls = reload();
+ Thread.currentThread().setContextClassLoader(cls.getClassLoader());
+ execute(cls);
+
+ // Context classloader is the "bootclassloader". This is technically
+ // bad, but LogFactoryImpl.ALLOW_FLAWED_CONTEXT defaults to true so
+ // this test should pass.
+ cls = reload();
+ Thread.currentThread().setContextClassLoader(null);
+ execute(cls);
+
+ // Context classloader is the "bootclassloader". This is same as above
+ // except that ALLOW_FLAWED_CONTEXT is set to false; an error should
+ // now be reported.
+ cls = reload();
+ Thread.currentThread().setContextClassLoader(null);
+ try {
+ setAllowFlawedContext(cls, "false");
+ execute(cls);
+ fail("Logging config succeeded when context classloader was null!");
+ } catch (final LogConfigurationException ex) {
+ // expected; the boot classloader doesn't *have* JCL available
+ }
+
+ // Context classloader is the system classloader.
+ //
+ // This is expected to cause problems, as LogFactoryImpl will attempt
+ // to use the system classloader to load the Log4JLogger class, which
+ // will then be unable to cast that object to the Log interface loaded
+ // via the child classloader. However as ALLOW_FLAWED_CONTEXT defaults
+ // to true this test should pass.
+ cls = reload();
+ Thread.currentThread().setContextClassLoader(ClassLoader.getSystemClassLoader());
+ execute(cls);
+
+ // Context classloader is the system classloader. This is the same
+ // as above except that ALLOW_FLAWED_CONTEXT is set to false; an error
+ // should now be reported.
+ cls = reload();
+ Thread.currentThread().setContextClassLoader(ClassLoader.getSystemClassLoader());
+ try {
+ setAllowFlawedContext(cls, "false");
+ execute(cls);
+ fail("Error: somehow downcast a Logger loaded via system classloader"
+ + " to the Log interface loaded via a custom classloader");
+ } catch (final LogConfigurationException ex) {
+ // expected
+ }
+ }
+
+ /**
+ * Load class UserClass via a temporary classloader which is a child of
+ * the classloader used to load this test class.
+ */
+ private Class reload() throws Exception {
+ Class testObjCls = null;
+ final AppClassLoader appLoader = new AppClassLoader(this.getClass().getClassLoader());
+ try {
+
+ testObjCls = appLoader.loadClass(UserClass.class.getName());
+
+ } catch (final ClassNotFoundException cnfe) {
+ throw cnfe;
+ } catch (final Throwable t) {
+ t.printStackTrace();
+ fail("AppClassLoader failed ");
+ }
+
+ assertSame("app isolated", testObjCls.getClassLoader(), appLoader);
+
+ return testObjCls;
+
+ }
+
+
+ private void execute(final Class cls) throws Exception {
+ cls.newInstance();
+ }
+
+ @Override
+ public void setUp() {
+ // save state before test starts so we can restore it when test ends
+ origContextClassLoader = Thread.currentThread().getContextClassLoader();
+ }
+
+ @Override
+ public void tearDown() {
+ // restore original state so a test can't stuff up later tests.
+ Thread.currentThread().setContextClassLoader(origContextClassLoader);
+ }
+
+ private ClassLoader origContextClassLoader;
+}
diff --git a/src/test/java/org/apache/commons/logging/avalon/AvalonLoggerTestCase.java b/src/test/java/org/apache/commons/logging/avalon/AvalonLoggerTestCase.java
index bce0a85..f8d6d14 100644
--- a/src/test/java/org/apache/commons/logging/avalon/AvalonLoggerTestCase.java
+++ b/src/test/java/org/apache/commons/logging/avalon/AvalonLoggerTestCase.java
@@ -1,43 +1,43 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.commons.logging.avalon;
-
-import org.apache.avalon.framework.logger.NullLogger;
-import org.apache.commons.logging.impl.AvalonLogger;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.AbstractLogTest;
-
-import junit.framework.Test;
-import junit.framework.TestSuite;
-
-/**
- */
-public class AvalonLoggerTestCase extends AbstractLogTest {
-
- public static Test suite() {
- final TestSuite suite = new TestSuite();
- suite.addTestSuite(AvalonLoggerTestCase.class);
- return suite;
- }
-
- @Override
- public Log getLogObject() {
- // Output does not seem to be used, so don't display it.
- final Log log = new AvalonLogger(new NullLogger());
- return log;
- }
-}
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.logging.avalon;
+
+import org.apache.avalon.framework.logger.NullLogger;
+import org.apache.commons.logging.impl.AvalonLogger;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.AbstractLogTest;
+
+import junit.framework.Test;
+import junit.framework.TestSuite;
+
+/**
+ */
+public class AvalonLoggerTestCase extends AbstractLogTest {
+
+ public static Test suite() {
+ final TestSuite suite = new TestSuite();
+ suite.addTestSuite(AvalonLoggerTestCase.class);
+ return suite;
+ }
+
+ @Override
+ public Log getLogObject() {
+ // Output does not seem to be used, so don't display it.
+ final Log log = new AvalonLogger(new NullLogger());
+ return log;
+ }
+}
diff --git a/src/test/java/org/apache/commons/logging/jdk14/CustomConfigTestCase.java b/src/test/java/org/apache/commons/logging/jdk14/CustomConfigTestCase.java
index 4995c5e..0c6abbb 100644
--- a/src/test/java/org/apache/commons/logging/jdk14/CustomConfigTestCase.java
+++ b/src/test/java/org/apache/commons/logging/jdk14/CustomConfigTestCase.java
@@ -1,396 +1,396 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.commons.logging.jdk14;
-
-
-import java.io.ByteArrayOutputStream;
-import java.io.InputStream;
-import java.lang.reflect.Method;
-import java.util.Iterator;
-import java.util.logging.Handler;
-import java.util.logging.Level;
-import java.util.logging.LogManager;
-import java.util.logging.LogRecord;
-import java.util.logging.Logger;
-
-import junit.framework.Test;
-
-import org.apache.commons.logging.DummyException;
-import org.apache.commons.logging.PathableClassLoader;
-import org.apache.commons.logging.PathableTestSuite;
-
-
-/**
- * TestCase for JDK 1.4 logging when running on a JDK 1.4 system with
- * custom configuration, so that JDK 1.4 should be selected and an appropriate
- * logger configured per the configuration properties. Construct a new instance of this test case. The customized {@code Handler} we will be using. The underlying {@code Handler}s we will be using. The underlying {@code Logger} we will be using. The underlying {@code LogManager} we will be using. The message levels that should have been logged. The message strings that should have been logged. TestCase for JDK 1.4 logging when running on a JDK 1.4 system with
+ * custom configuration, so that JDK 1.4 should be selected and an appropriate
+ * logger configured per the configuration properties. Construct a new instance of this test case. The customized {@code Handler} we will be using. The underlying {@code Handler}s we will be using. The underlying {@code Logger} we will be using. The underlying {@code LogManager} we will be using. The message levels that should have been logged. The message strings that should have been logged. TestCase for JDK 1.4 logging when running on a JDK 1.4 system with
- * zero configuration, and with Log4J not present (so JDK 1.4 logging
- * should be automatically configured. Construct a new instance of this test case. The {@link LogFactory} implementation we have selected. The {@link Log} implementation we have selected. TestCase for JDK 1.4 logging when running on a JDK 1.4 system with
+ * zero configuration, and with Log4J not present (so JDK 1.4 logging
+ * should be automatically configured. Construct a new instance of this test case. The {@link LogFactory} implementation we have selected. The {@link Log} implementation we have selected. Test implementation of {@code java.util.logging.Handler}. Test implementation of {@code java.util.logging.Handler}. TestCase for simple logging when running with custom configuration
- * properties. The expected log records. The message levels that should have been logged. The message strings that should have been logged.
- * We need to use a PathableClassLoader here because the SimpleLog class
- * is a pile of junk and chock-full of static variables. Any other test
- * (like simple.CustomConfigTestCase) that has used the SimpleLog class
- * will already have caused it to do once-only initialization that we
- * can't reset, even by calling LogFactory.releaseAll, because of those
- * ugly statics. The only clean solution is to load a clean copy of
- * commons-logging including SimpleLog via a nice clean class loader.
- * Or we could fix SimpleLog to be sane...
- */
- public static Test suite() throws Exception {
- final Class thisClass = CustomConfigTestCase.class;
-
- final PathableClassLoader loader = new PathableClassLoader(null);
- loader.useExplicitLoader("junit.", Test.class.getClassLoader());
- loader.addLogicalLib("testclasses");
- loader.addLogicalLib("commons-logging");
-
- final Class testClass = loader.loadClass(thisClass.getName());
- return new PathableTestSuite(testClass, loader);
- }
-
- /**
- * Tear down instance variables required by this test case.
- */
- @Override
- public void tearDown() {
- super.tearDown();
- expected = null;
- }
-
- // Test logging message strings with exceptions
- public void testExceptionMessages() throws Exception {
- ((DecoratedSimpleLog) log).clearCache();
- logExceptionMessages();
- checkExpected();
- }
-
- // Test logging plain message strings
- public void testPlainMessages() throws Exception {
- ((DecoratedSimpleLog) log).clearCache();
- logPlainMessages();
- checkExpected();
- }
-
- // Test Serializability of standard instance
- @Override
- public void testSerializable() throws Exception {
- ((DecoratedSimpleLog) log).clearCache();
- logPlainMessages();
- super.testSerializable();
- logExceptionMessages();
- checkExpected();
- }
-
- // Check the decorated log instance
- @Override
- protected void checkDecorated() {
-
- assertNotNull("Log exists", log);
- assertEquals("Log class",
- "org.apache.commons.logging.simple.DecoratedSimpleLog",
- log.getClass().getName());
-
- // Can we call level checkers with no exceptions?
- assertTrue(log.isDebugEnabled());
- assertTrue(log.isErrorEnabled());
- assertTrue(log.isFatalEnabled());
- assertTrue(log.isInfoEnabled());
- assertFalse(log.isTraceEnabled());
- assertTrue(log.isWarnEnabled());
-
- // Can we retrieve the current log level?
- assertEquals(SimpleLog.LOG_LEVEL_DEBUG, ((SimpleLog) log).getLevel());
-
- // Can we validate the extra exposed properties?
- checkDecoratedDateTime();
- assertEquals("DecoratedLogger",
- ((DecoratedSimpleLog) log).getLogName());
- checkShowDateTime();
- assertTrue(((DecoratedSimpleLog) log).getShowShortName());
-
- }
-
- /** Hook for subclassses */
- protected void checkShowDateTime() {
- assertFalse(((DecoratedSimpleLog) log).getShowDateTime());
- }
-
- /** Hook for subclasses */
- protected void checkDecoratedDateTime() {
- assertEquals("yyyy/MM/dd HH:mm:ss:SSS zzz",
- ((DecoratedSimpleLog) log).getDateTimeFormat());
- }
-
-
-
- // Check the actual log records against the expected ones
- protected void checkExpected() {
- final List acts = ((DecoratedSimpleLog) log).getCache();
- final Iterator exps = expected.iterator();
- int n = 0;
- while (exps.hasNext()) {
- final LogRecord exp = (LogRecord) exps.next();
- final LogRecord act = (LogRecord) acts.get(n++);
- assertEquals("Row " + n + " type", exp.type, act.type);
- assertEquals("Row " + n + " message", exp.message, act.message);
- assertEquals("Row " + n + " throwable", exp.t, act.t);
- }
- }
-
-
- // Check the standard log instance
- @Override
- protected void checkStandard() {
- checkDecorated();
- }
-
-
- // Log the messages with exceptions
- protected void logExceptionMessages() {
- // Generate log records
- final Throwable t = new DummyException();
- log.trace("trace", t); // Should not actually get logged
- log.debug("debug", t);
- log.info("info", t);
- log.warn("warn", t);
- log.error("error", t);
- log.fatal("fatal", t);
-
- // Record the log records we expect
- expected.add(new LogRecord(SimpleLog.LOG_LEVEL_DEBUG, "debug", t));
- expected.add(new LogRecord(SimpleLog.LOG_LEVEL_INFO, "info", t));
- expected.add(new LogRecord(SimpleLog.LOG_LEVEL_WARN, "warn", t));
- expected.add(new LogRecord(SimpleLog.LOG_LEVEL_ERROR, "error", t));
- expected.add(new LogRecord(SimpleLog.LOG_LEVEL_FATAL, "fatal", t));
- }
-
-
- // Log the plain messages
- protected void logPlainMessages() {
- // Generate log records
- log.trace("trace"); // Should not actually get logged
- log.debug("debug");
- log.info("info");
- log.warn("warn");
- log.error("error");
- log.fatal("fatal");
-
- // Record the log records we expect
- expected.add(new LogRecord(SimpleLog.LOG_LEVEL_DEBUG, "debug", null));
- expected.add(new LogRecord(SimpleLog.LOG_LEVEL_INFO, "info", null));
- expected.add(new LogRecord(SimpleLog.LOG_LEVEL_WARN, "warn", null));
- expected.add(new LogRecord(SimpleLog.LOG_LEVEL_ERROR, "error", null));
- expected.add(new LogRecord(SimpleLog.LOG_LEVEL_FATAL, "fatal", null));
- }
-}
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.logging.simple;
+
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import junit.framework.Test;
+
+import org.apache.commons.logging.DummyException;
+import org.apache.commons.logging.LogFactory;
+import org.apache.commons.logging.PathableClassLoader;
+import org.apache.commons.logging.PathableTestSuite;
+import org.apache.commons.logging.impl.SimpleLog;
+
+
+/**
+ * TestCase for simple logging when running with custom configuration
+ * properties. The expected log records. The message levels that should have been logged. The message strings that should have been logged.
+ * We need to use a PathableClassLoader here because the SimpleLog class
+ * is a pile of junk and chock-full of static variables. Any other test
+ * (like simple.CustomConfigTestCase) that has used the SimpleLog class
+ * will already have caused it to do once-only initialization that we
+ * can't reset, even by calling LogFactory.releaseAll, because of those
+ * ugly statics. The only clean solution is to load a clean copy of
+ * commons-logging including SimpleLog via a nice clean class loader.
+ * Or we could fix SimpleLog to be sane...
+ */
+ public static Test suite() throws Exception {
+ final Class thisClass = CustomConfigTestCase.class;
+
+ final PathableClassLoader loader = new PathableClassLoader(null);
+ loader.useExplicitLoader("junit.", Test.class.getClassLoader());
+ loader.addLogicalLib("testclasses");
+ loader.addLogicalLib("commons-logging");
+
+ final Class testClass = loader.loadClass(thisClass.getName());
+ return new PathableTestSuite(testClass, loader);
+ }
+
+ /**
+ * Tear down instance variables required by this test case.
+ */
+ @Override
+ public void tearDown() {
+ super.tearDown();
+ expected = null;
+ }
+
+ // Test logging message strings with exceptions
+ public void testExceptionMessages() throws Exception {
+ ((DecoratedSimpleLog) log).clearCache();
+ logExceptionMessages();
+ checkExpected();
+ }
+
+ // Test logging plain message strings
+ public void testPlainMessages() throws Exception {
+ ((DecoratedSimpleLog) log).clearCache();
+ logPlainMessages();
+ checkExpected();
+ }
+
+ // Test Serializability of standard instance
+ @Override
+ public void testSerializable() throws Exception {
+ ((DecoratedSimpleLog) log).clearCache();
+ logPlainMessages();
+ super.testSerializable();
+ logExceptionMessages();
+ checkExpected();
+ }
+
+ // Check the decorated log instance
+ @Override
+ protected void checkDecorated() {
+
+ assertNotNull("Log exists", log);
+ assertEquals("Log class",
+ "org.apache.commons.logging.simple.DecoratedSimpleLog",
+ log.getClass().getName());
+
+ // Can we call level checkers with no exceptions?
+ assertTrue(log.isDebugEnabled());
+ assertTrue(log.isErrorEnabled());
+ assertTrue(log.isFatalEnabled());
+ assertTrue(log.isInfoEnabled());
+ assertFalse(log.isTraceEnabled());
+ assertTrue(log.isWarnEnabled());
+
+ // Can we retrieve the current log level?
+ assertEquals(SimpleLog.LOG_LEVEL_DEBUG, ((SimpleLog) log).getLevel());
+
+ // Can we validate the extra exposed properties?
+ checkDecoratedDateTime();
+ assertEquals("DecoratedLogger",
+ ((DecoratedSimpleLog) log).getLogName());
+ checkShowDateTime();
+ assertTrue(((DecoratedSimpleLog) log).getShowShortName());
+
+ }
+
+ /** Hook for subclassses */
+ protected void checkShowDateTime() {
+ assertFalse(((DecoratedSimpleLog) log).getShowDateTime());
+ }
+
+ /** Hook for subclasses */
+ protected void checkDecoratedDateTime() {
+ assertEquals("yyyy/MM/dd HH:mm:ss:SSS zzz",
+ ((DecoratedSimpleLog) log).getDateTimeFormat());
+ }
+
+
+
+ // Check the actual log records against the expected ones
+ protected void checkExpected() {
+ final List acts = ((DecoratedSimpleLog) log).getCache();
+ final Iterator exps = expected.iterator();
+ int n = 0;
+ while (exps.hasNext()) {
+ final LogRecord exp = (LogRecord) exps.next();
+ final LogRecord act = (LogRecord) acts.get(n++);
+ assertEquals("Row " + n + " type", exp.type, act.type);
+ assertEquals("Row " + n + " message", exp.message, act.message);
+ assertEquals("Row " + n + " throwable", exp.t, act.t);
+ }
+ }
+
+
+ // Check the standard log instance
+ @Override
+ protected void checkStandard() {
+ checkDecorated();
+ }
+
+
+ // Log the messages with exceptions
+ protected void logExceptionMessages() {
+ // Generate log records
+ final Throwable t = new DummyException();
+ log.trace("trace", t); // Should not actually get logged
+ log.debug("debug", t);
+ log.info("info", t);
+ log.warn("warn", t);
+ log.error("error", t);
+ log.fatal("fatal", t);
+
+ // Record the log records we expect
+ expected.add(new LogRecord(SimpleLog.LOG_LEVEL_DEBUG, "debug", t));
+ expected.add(new LogRecord(SimpleLog.LOG_LEVEL_INFO, "info", t));
+ expected.add(new LogRecord(SimpleLog.LOG_LEVEL_WARN, "warn", t));
+ expected.add(new LogRecord(SimpleLog.LOG_LEVEL_ERROR, "error", t));
+ expected.add(new LogRecord(SimpleLog.LOG_LEVEL_FATAL, "fatal", t));
+ }
+
+
+ // Log the plain messages
+ protected void logPlainMessages() {
+ // Generate log records
+ log.trace("trace"); // Should not actually get logged
+ log.debug("debug");
+ log.info("info");
+ log.warn("warn");
+ log.error("error");
+ log.fatal("fatal");
+
+ // Record the log records we expect
+ expected.add(new LogRecord(SimpleLog.LOG_LEVEL_DEBUG, "debug", null));
+ expected.add(new LogRecord(SimpleLog.LOG_LEVEL_INFO, "info", null));
+ expected.add(new LogRecord(SimpleLog.LOG_LEVEL_WARN, "warn", null));
+ expected.add(new LogRecord(SimpleLog.LOG_LEVEL_ERROR, "error", null));
+ expected.add(new LogRecord(SimpleLog.LOG_LEVEL_FATAL, "fatal", null));
+ }
+}
diff --git a/src/test/java/org/apache/commons/logging/simple/DateTimeCustomConfigTestCase.java b/src/test/java/org/apache/commons/logging/simple/DateTimeCustomConfigTestCase.java
index 587d656..2344ad4 100644
--- a/src/test/java/org/apache/commons/logging/simple/DateTimeCustomConfigTestCase.java
+++ b/src/test/java/org/apache/commons/logging/simple/DateTimeCustomConfigTestCase.java
@@ -1,109 +1,109 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.commons.logging.simple;
-
-import java.text.DateFormat;
-import java.text.SimpleDateFormat;
-import java.util.Date;
-
-import junit.framework.Test;
-
-import org.apache.commons.logging.PathableClassLoader;
-import org.apache.commons.logging.PathableTestSuite;
-
-
-/**
- * Tests custom date time format configuration
- */
-public class DateTimeCustomConfigTestCase extends CustomConfigTestCase {
-
- // ----------------------------------------------------------- Constructors
-
- /**
- * Return the tests included in this test suite.
- *
- * We need to use a PathableClassLoader here because the SimpleLog class
- * is a pile of junk and chock-full of static variables. Any other test
- * (like simple.CustomConfigTestCase) that has used the SimpleLog class
- * will already have caused it to do once-only initialization that we
- * can't reset, even by calling LogFactory.releaseAll, because of those
- * ugly statics. The only clean solution is to load a clean copy of
- * commons-logging including SimpleLog via a nice clean class loader.
- * Or we could fix SimpleLog to be sane...
- */
- public static Test suite() throws Exception {
- final Class thisClass = DateTimeCustomConfigTestCase.class;
-
- final PathableClassLoader loader = new PathableClassLoader(null);
- loader.useExplicitLoader("junit.", Test.class.getClassLoader());
- loader.addLogicalLib("testclasses");
- loader.addLogicalLib("commons-logging");
-
- final Class testClass = loader.loadClass(thisClass.getName());
- return new PathableTestSuite(testClass, loader);
- }
-
-
- /**
- * Set up system properties required by this unit test. Here, we
- * set up the props defined in the parent class setProperties method,
- * and add a few to configure the SimpleLog class date/time output.
- */
- @Override
- public void setProperties() {
- super.setProperties();
-
- System.setProperty(
- "org.apache.commons.logging.simplelog.dateTimeFormat",
- "dd.mm.yyyy");
- System.setProperty(
- "org.apache.commons.logging.simplelog.showdatetime",
- "true");
- }
-
- /**
- * Set up instance variables required by this test case.
- */
- @Override
- public void setUp() throws Exception {
- super.setUp();
- }
-
-
- // ----------------------------------------------------------- Methods
-
- /** Checks that the date time format has been successfully set */
- @Override
- protected void checkDecoratedDateTime() {
- assertEquals("Expected date format to be set", "dd.mm.yyyy",
- ((DecoratedSimpleLog) log).getDateTimeFormat());
- // try the formatter
- final Date now = new Date();
- final DateFormat formatter = ((DecoratedSimpleLog) log).getDateTimeFormatter();
- final SimpleDateFormat sampleFormatter = new SimpleDateFormat("dd.mm.yyyy");
- assertEquals("Date should be formatters to pattern dd.mm.yyyy",
- sampleFormatter.format(now), formatter.format(now));
- }
-
- /** Hook for subclassses */
- @Override
- protected void checkShowDateTime() {
- assertTrue(((DecoratedSimpleLog) log).getShowDateTime());
- }
-
-}
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.logging.simple;
+
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import junit.framework.Test;
+
+import org.apache.commons.logging.PathableClassLoader;
+import org.apache.commons.logging.PathableTestSuite;
+
+
+/**
+ * Tests custom date time format configuration
+ */
+public class DateTimeCustomConfigTestCase extends CustomConfigTestCase {
+
+ // ----------------------------------------------------------- Constructors
+
+ /**
+ * Return the tests included in this test suite.
+ *
+ * We need to use a PathableClassLoader here because the SimpleLog class
+ * is a pile of junk and chock-full of static variables. Any other test
+ * (like simple.CustomConfigTestCase) that has used the SimpleLog class
+ * will already have caused it to do once-only initialization that we
+ * can't reset, even by calling LogFactory.releaseAll, because of those
+ * ugly statics. The only clean solution is to load a clean copy of
+ * commons-logging including SimpleLog via a nice clean class loader.
+ * Or we could fix SimpleLog to be sane...
+ */
+ public static Test suite() throws Exception {
+ final Class thisClass = DateTimeCustomConfigTestCase.class;
+
+ final PathableClassLoader loader = new PathableClassLoader(null);
+ loader.useExplicitLoader("junit.", Test.class.getClassLoader());
+ loader.addLogicalLib("testclasses");
+ loader.addLogicalLib("commons-logging");
+
+ final Class testClass = loader.loadClass(thisClass.getName());
+ return new PathableTestSuite(testClass, loader);
+ }
+
+
+ /**
+ * Set up system properties required by this unit test. Here, we
+ * set up the props defined in the parent class setProperties method,
+ * and add a few to configure the SimpleLog class date/time output.
+ */
+ @Override
+ public void setProperties() {
+ super.setProperties();
+
+ System.setProperty(
+ "org.apache.commons.logging.simplelog.dateTimeFormat",
+ "dd.mm.yyyy");
+ System.setProperty(
+ "org.apache.commons.logging.simplelog.showdatetime",
+ "true");
+ }
+
+ /**
+ * Set up instance variables required by this test case.
+ */
+ @Override
+ public void setUp() throws Exception {
+ super.setUp();
+ }
+
+
+ // ----------------------------------------------------------- Methods
+
+ /** Checks that the date time format has been successfully set */
+ @Override
+ protected void checkDecoratedDateTime() {
+ assertEquals("Expected date format to be set", "dd.mm.yyyy",
+ ((DecoratedSimpleLog) log).getDateTimeFormat());
+ // try the formatter
+ final Date now = new Date();
+ final DateFormat formatter = ((DecoratedSimpleLog) log).getDateTimeFormatter();
+ final SimpleDateFormat sampleFormatter = new SimpleDateFormat("dd.mm.yyyy");
+ assertEquals("Date should be formatters to pattern dd.mm.yyyy",
+ sampleFormatter.format(now), formatter.format(now));
+ }
+
+ /** Hook for subclassses */
+ @Override
+ protected void checkShowDateTime() {
+ assertTrue(((DecoratedSimpleLog) log).getShowDateTime());
+ }
+
+}
diff --git a/src/test/java/org/apache/commons/logging/simple/DefaultConfigTestCase.java b/src/test/java/org/apache/commons/logging/simple/DefaultConfigTestCase.java
index c96abb5..1e3fade 100644
--- a/src/test/java/org/apache/commons/logging/simple/DefaultConfigTestCase.java
+++ b/src/test/java/org/apache/commons/logging/simple/DefaultConfigTestCase.java
@@ -1,216 +1,216 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.commons.logging.simple;
-
-
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-
-import junit.framework.Test;
-import junit.framework.TestCase;
-
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-import org.apache.commons.logging.PathableClassLoader;
-import org.apache.commons.logging.PathableTestSuite;
-import org.apache.commons.logging.impl.SimpleLog;
-
-
-/**
- * TestCase for simple logging when running with zero configuration
- * other than selecting the SimpleLog implementation. The {@link LogFactory} implementation we have selected. The {@link Log} implementation we have selected.
- * We need to use a PathableClassLoader here because the SimpleLog class
- * is a pile of junk and chock-full of static variables. Any other test
- * (like simple.CustomConfigTestCase) that has used the SimpleLog class
- * will already have caused it to do once-only initialization that we
- * can't reset, even by calling LogFactory.releaseAll, because of those
- * ugly statics. The only clean solution is to load a clean copy of
- * commons-logging including SimpleLog via a nice clean class loader.
- * Or we could fix SimpleLog to be sane...
- */
- public static Test suite() throws Exception {
- final Class thisClass = DefaultConfigTestCase.class;
-
- final PathableClassLoader loader = new PathableClassLoader(null);
- loader.useExplicitLoader("junit.", Test.class.getClassLoader());
- loader.addLogicalLib("testclasses");
- loader.addLogicalLib("commons-logging");
-
- final Class testClass = loader.loadClass(thisClass.getName());
- return new PathableTestSuite(testClass, loader);
- }
-
- /**
- * Set system properties that will control the LogFactory/Log objects
- * when they are created. Subclasses can override this method to
- * define properties that suit them.
- */
- public void setProperties() {
- System.setProperty(
- "org.apache.commons.logging.Log",
- "org.apache.commons.logging.impl.SimpleLog");
- }
-
- /**
- * Set up instance variables required by this test case.
- */
- @Override
- public void setUp() throws Exception {
- LogFactory.releaseAll();
- setProperties();
- setUpFactory();
- setUpLog("TestLogger");
- }
-
- /**
- * Tear down instance variables required by this test case.
- */
- @Override
- public void tearDown() {
- log = null;
- factory = null;
- LogFactory.releaseAll();
- }
-
- // Test pristine DecoratedSimpleLog instance
- public void testPristineDecorated() {
- setUpDecorated("DecoratedLogger");
- checkDecorated();
- }
-
- // Test pristine Log instance
- public void testPristineLog() {
- checkStandard();
- }
-
- // Test pristine LogFactory instance
- public void testPristineFactory() {
- assertNotNull("LogFactory exists", factory);
- assertEquals("LogFactory class",
- "org.apache.commons.logging.impl.LogFactoryImpl",
- factory.getClass().getName());
-
- final String[] names = factory.getAttributeNames();
- assertNotNull("Names exists", names);
- assertEquals("Names empty", 0, names.length);
- }
-
- // Test Serializability of standard instance
- public void testSerializable() throws Exception {
-
- // Serialize and deserialize the instance
- final ByteArrayOutputStream baos = new ByteArrayOutputStream();
- final ObjectOutputStream oos = new ObjectOutputStream(baos);
- oos.writeObject(log);
- oos.close();
- final ByteArrayInputStream bais =
- new ByteArrayInputStream(baos.toByteArray());
- final ObjectInputStream ois = new ObjectInputStream(bais);
- log = (Log) ois.readObject();
- ois.close();
-
- // Check the characteristics of the resulting object
- checkStandard();
-
- }
-
- // Check the decorated log instance
- protected void checkDecorated() {
- assertNotNull("Log exists", log);
- assertEquals("Log class",
- "org.apache.commons.logging.simple.DecoratedSimpleLog",
- log.getClass().getName());
-
- // Can we call level checkers with no exceptions?
- assertFalse(log.isDebugEnabled());
- assertTrue(log.isErrorEnabled());
- assertTrue(log.isFatalEnabled());
- assertTrue(log.isInfoEnabled());
- assertFalse(log.isTraceEnabled());
- assertTrue(log.isWarnEnabled());
-
- // Can we retrieve the current log level?
- assertEquals(SimpleLog.LOG_LEVEL_INFO, ((SimpleLog) log).getLevel());
-
- // Can we validate the extra exposed properties?
- assertEquals("yyyy/MM/dd HH:mm:ss:SSS zzz",
- ((DecoratedSimpleLog) log).getDateTimeFormat());
- assertEquals("DecoratedLogger",
- ((DecoratedSimpleLog) log).getLogName());
- assertFalse(((DecoratedSimpleLog) log).getShowDateTime());
- assertTrue(((DecoratedSimpleLog) log).getShowShortName());
- }
-
-
- // Check the standard log instance
- protected void checkStandard() {
- assertNotNull("Log exists", log);
- assertEquals("Log class",
- "org.apache.commons.logging.impl.SimpleLog",
- log.getClass().getName());
-
- // Can we call level checkers with no exceptions?
- assertFalse(log.isDebugEnabled());
- assertTrue(log.isErrorEnabled());
- assertTrue(log.isFatalEnabled());
- assertTrue(log.isInfoEnabled());
- assertFalse(log.isTraceEnabled());
- assertTrue(log.isWarnEnabled());
-
- // Can we retrieve the current log level?
- assertEquals(SimpleLog.LOG_LEVEL_INFO, ((SimpleLog) log).getLevel());
- }
-
-
- // Set up decorated log instance
- protected void setUpDecorated(final String name) {
- log = new DecoratedSimpleLog(name);
- }
-
-
- // Set up factory instance
- protected void setUpFactory() throws Exception {
- factory = LogFactory.getFactory();
- }
-
-
- // Set up log instance
- protected void setUpLog(final String name) throws Exception {
- log = LogFactory.getLog(name);
- }
-
-}
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.commons.logging.simple;
+
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+
+import junit.framework.Test;
+import junit.framework.TestCase;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.commons.logging.PathableClassLoader;
+import org.apache.commons.logging.PathableTestSuite;
+import org.apache.commons.logging.impl.SimpleLog;
+
+
+/**
+ * TestCase for simple logging when running with zero configuration
+ * other than selecting the SimpleLog implementation. The {@link LogFactory} implementation we have selected. The {@link Log} implementation we have selected.
+ * We need to use a PathableClassLoader here because the SimpleLog class
+ * is a pile of junk and chock-full of static variables. Any other test
+ * (like simple.CustomConfigTestCase) that has used the SimpleLog class
+ * will already have caused it to do once-only initialization that we
+ * can't reset, even by calling LogFactory.releaseAll, because of those
+ * ugly statics. The only clean solution is to load a clean copy of
+ * commons-logging including SimpleLog via a nice clean class loader.
+ * Or we could fix SimpleLog to be sane...
+ */
+ public static Test suite() throws Exception {
+ final Class thisClass = DefaultConfigTestCase.class;
+
+ final PathableClassLoader loader = new PathableClassLoader(null);
+ loader.useExplicitLoader("junit.", Test.class.getClassLoader());
+ loader.addLogicalLib("testclasses");
+ loader.addLogicalLib("commons-logging");
+
+ final Class testClass = loader.loadClass(thisClass.getName());
+ return new PathableTestSuite(testClass, loader);
+ }
+
+ /**
+ * Set system properties that will control the LogFactory/Log objects
+ * when they are created. Subclasses can override this method to
+ * define properties that suit them.
+ */
+ public void setProperties() {
+ System.setProperty(
+ "org.apache.commons.logging.Log",
+ "org.apache.commons.logging.impl.SimpleLog");
+ }
+
+ /**
+ * Set up instance variables required by this test case.
+ */
+ @Override
+ public void setUp() throws Exception {
+ LogFactory.releaseAll();
+ setProperties();
+ setUpFactory();
+ setUpLog("TestLogger");
+ }
+
+ /**
+ * Tear down instance variables required by this test case.
+ */
+ @Override
+ public void tearDown() {
+ log = null;
+ factory = null;
+ LogFactory.releaseAll();
+ }
+
+ // Test pristine DecoratedSimpleLog instance
+ public void testPristineDecorated() {
+ setUpDecorated("DecoratedLogger");
+ checkDecorated();
+ }
+
+ // Test pristine Log instance
+ public void testPristineLog() {
+ checkStandard();
+ }
+
+ // Test pristine LogFactory instance
+ public void testPristineFactory() {
+ assertNotNull("LogFactory exists", factory);
+ assertEquals("LogFactory class",
+ "org.apache.commons.logging.impl.LogFactoryImpl",
+ factory.getClass().getName());
+
+ final String[] names = factory.getAttributeNames();
+ assertNotNull("Names exists", names);
+ assertEquals("Names empty", 0, names.length);
+ }
+
+ // Test Serializability of standard instance
+ public void testSerializable() throws Exception {
+
+ // Serialize and deserialize the instance
+ final ByteArrayOutputStream baos = new ByteArrayOutputStream();
+ final ObjectOutputStream oos = new ObjectOutputStream(baos);
+ oos.writeObject(log);
+ oos.close();
+ final ByteArrayInputStream bais =
+ new ByteArrayInputStream(baos.toByteArray());
+ final ObjectInputStream ois = new ObjectInputStream(bais);
+ log = (Log) ois.readObject();
+ ois.close();
+
+ // Check the characteristics of the resulting object
+ checkStandard();
+
+ }
+
+ // Check the decorated log instance
+ protected void checkDecorated() {
+ assertNotNull("Log exists", log);
+ assertEquals("Log class",
+ "org.apache.commons.logging.simple.DecoratedSimpleLog",
+ log.getClass().getName());
+
+ // Can we call level checkers with no exceptions?
+ assertFalse(log.isDebugEnabled());
+ assertTrue(log.isErrorEnabled());
+ assertTrue(log.isFatalEnabled());
+ assertTrue(log.isInfoEnabled());
+ assertFalse(log.isTraceEnabled());
+ assertTrue(log.isWarnEnabled());
+
+ // Can we retrieve the current log level?
+ assertEquals(SimpleLog.LOG_LEVEL_INFO, ((SimpleLog) log).getLevel());
+
+ // Can we validate the extra exposed properties?
+ assertEquals("yyyy/MM/dd HH:mm:ss:SSS zzz",
+ ((DecoratedSimpleLog) log).getDateTimeFormat());
+ assertEquals("DecoratedLogger",
+ ((DecoratedSimpleLog) log).getLogName());
+ assertFalse(((DecoratedSimpleLog) log).getShowDateTime());
+ assertTrue(((DecoratedSimpleLog) log).getShowShortName());
+ }
+
+
+ // Check the standard log instance
+ protected void checkStandard() {
+ assertNotNull("Log exists", log);
+ assertEquals("Log class",
+ "org.apache.commons.logging.impl.SimpleLog",
+ log.getClass().getName());
+
+ // Can we call level checkers with no exceptions?
+ assertFalse(log.isDebugEnabled());
+ assertTrue(log.isErrorEnabled());
+ assertTrue(log.isFatalEnabled());
+ assertTrue(log.isInfoEnabled());
+ assertFalse(log.isTraceEnabled());
+ assertTrue(log.isWarnEnabled());
+
+ // Can we retrieve the current log level?
+ assertEquals(SimpleLog.LOG_LEVEL_INFO, ((SimpleLog) log).getLevel());
+ }
+
+
+ // Set up decorated log instance
+ protected void setUpDecorated(final String name) {
+ log = new DecoratedSimpleLog(name);
+ }
+
+
+ // Set up factory instance
+ protected void setUpFactory() throws Exception {
+ factory = LogFactory.getFactory();
+ }
+
+
+ // Set up log instance
+ protected void setUpLog(final String name) throws Exception {
+ log = LogFactory.getLog(name);
+ }
+
+}
- *
- * Note that {@code factories} is a Hashtable (not a HashMap),
- * and hashtables don't allow null as a key.
- * @deprecated since 1.1.2
- */
- @Deprecated
- protected static volatile LogFactory nullClassLoaderFactory;
-
- /**
- * Create the hashtable which will be used to store a map of
- * (context-classloader -> logfactory-object). Version 1.2+ of Java
- * supports "weak references", allowing a custom Hashtable class
- * to be used which uses only weak references to its keys. Using weak
- * references can fix memory leaks on webapp unload in some cases (though
- * not all). Version 1.1 of Java does not support weak references, so we
- * must dynamically determine which we are using. And just for fun, this
- * code also supports the ability for a system property to specify an
- * arbitrary Hashtable implementation name.
- *
- *
- *
- * @param t the Throwable to check
- */
- protected static void handleThrowable(final Throwable t) {
- if (t instanceof ThreadDeath) {
- throw (ThreadDeath) t;
- }
- if (t instanceof VirtualMachineError) {
- throw (VirtualMachineError) t;
- }
- // All other instances of Throwable will be silently ignored
- }
-
- /**
- * Construct (if necessary) and return a {@code LogFactory}
- * instance, using the following ordered lookup procedure to determine
- * the name of the implementation class to be loaded.
- *
- *
- * ClassLoader conflicts
- *
- * Class com.acme.Foo was loaded via classloader 11111
- * ClassLoader tree: 11111 -> 22222 (SYSTEM) -> 33333 -> BOOT
- *
- *
+ * [ERROR] LogFactory: Load of custom hashtable failed
+ *
+ * to system error and then continue using a standard Hashtable.
+ *
+ * <java classname="${test.runner}" fork="yes" failonerror="${test.failonerror}">
+ * ...
+ * <sysproperty
+ * key="org.apache.commons.logging.LogFactory.HashtableImpl"
+ * value="org.apache.commons.logging.AltHashtable"/>
+ * </java>
+ *
+ * will mean that {@code LogFactory} will load an instance of
+ * {@code org.apache.commons.logging.AltHashtable}.
+ *
+ *
+ * Note that {@code factories} is a Hashtable (not a HashMap),
+ * and hashtables don't allow null as a key.
+ * @deprecated since 1.1.2
+ */
+ @Deprecated
+ protected static volatile LogFactory nullClassLoaderFactory;
+
+ /**
+ * Create the hashtable which will be used to store a map of
+ * (context-classloader -> logfactory-object). Version 1.2+ of Java
+ * supports "weak references", allowing a custom Hashtable class
+ * to be used which uses only weak references to its keys. Using weak
+ * references can fix memory leaks on webapp unload in some cases (though
+ * not all). Version 1.1 of Java does not support weak references, so we
+ * must dynamically determine which we are using. And just for fun, this
+ * code also supports the ability for a system property to specify an
+ * arbitrary Hashtable implementation name.
+ *
+ *
+ *
+ * @param t the Throwable to check
+ */
+ protected static void handleThrowable(final Throwable t) {
+ if (t instanceof ThreadDeath) {
+ throw (ThreadDeath) t;
+ }
+ if (t instanceof VirtualMachineError) {
+ throw (VirtualMachineError) t;
+ }
+ // All other instances of Throwable will be silently ignored
+ }
+
+ /**
+ * Construct (if necessary) and return a {@code LogFactory}
+ * instance, using the following ordered lookup procedure to determine
+ * the name of the implementation class to be loaded.
+ *
+ *
+ * ClassLoader conflicts
+ *
+ * Class com.acme.Foo was loaded via classloader 11111
+ * ClassLoader tree: 11111 -> 22222 (SYSTEM) -> 33333 -> BOOT
+ *
+ *