No need to initialize instance variables to their default values.

src/main/java/org/apache/commons/logging/LogConfigurationException.java

@@ -69,7 +69,7 @@ public class LogConfigurationException extends RuntimeException {
     /**
      * The underlying cause of this exception.
      */
-    protected Throwable cause = null;
+    protected Throwable cause;
 
     /**
      * Return the underlying cause of this exception (if any).

src/main/java/org/apache/commons/logging/LogFactory.java

@@ -133,7 +133,7 @@ public abstract class LogFactory {
      * generated by LogFactory or LogFactoryImpl. When non-null,
      * interesting events will be written to the specified object.
      */
-    private static PrintStream diagnosticsStream = null;
+    private static PrintStream diagnosticsStream;
 
     /**
      * A string that gets prefixed to every message output by the
@@ -279,7 +279,7 @@ public abstract class LogFactory {
      * The previously constructed <code>LogFactory</code> instances, keyed by
      * the <code>ClassLoader</code> with which it was created.
      */
-    protected static Hashtable factories = null;
+    protected static Hashtable factories;
 
     /**
      * Previously constructed <code>LogFactory</code> instance as in the
@@ -296,7 +296,7 @@ public abstract class LogFactory {
      * and hashtables don't allow null as a key.
      * @deprecated since 1.1.2
      */
-    protected static volatile LogFactory nullClassLoaderFactory = null;
+    protected static volatile LogFactory nullClassLoaderFactory;
 
     /**
      * Create the hashtable which will be used to store a map of

src/main/java/org/apache/commons/logging/LogSource.java

@@ -59,13 +59,13 @@ public class LogSource {
     static protected Hashtable logs = new Hashtable();
 
     /** Is log4j available (in the current classpath) */
-    static protected boolean log4jIsAvailable = false;
+    static protected boolean log4jIsAvailable;
 
     /** Is JDK 1.4 logging available */
-    static protected boolean jdk14IsAvailable = false;
+    static protected boolean jdk14IsAvailable;
 
     /** Constructor for current log class */
-    static protected Constructor logImplctor = null;
+    static protected Constructor logImplctor;
 
     // ----------------------------------------------------- Class Initializers
 

src/main/java/org/apache/commons/logging/impl/AvalonLogger.java

@@ -52,7 +52,8 @@ import org.apache.commons.logging.Log;
 public class AvalonLogger implements Log {
 
     /** Ancestral Avalon logger. */
-    private static volatile Logger defaultLogger = null;
+    private static volatile Logger defaultLogger;
+
     /** Avalon logger used to perform log. */
     private final transient Logger logger;
 

src/main/java/org/apache/commons/logging/impl/Jdk13LumberjackLogger.java

@@ -45,11 +45,11 @@ public class Jdk13LumberjackLogger implements Log, Serializable {
     /**
      * The underlying Logger implementation we are using.
      */
-    protected transient Logger logger = null;
-    protected String name = null;
+    protected transient Logger logger;
+    protected String name;
     private String sourceClassName = "unknown";
     private String sourceMethodName = "unknown";
-    private boolean classAndMethodFound = false;
+    private boolean classAndMethodFound;
 
     /**
      * This member variable simply ensures that any attempt to initialise

src/main/java/org/apache/commons/logging/impl/Jdk14Logger.java

@@ -60,12 +60,12 @@ public class Jdk14Logger implements Log, Serializable {
     /**
      * The underlying Logger implementation we are using.
      */
-    protected transient Logger logger = null;
+    protected transient Logger logger;
 
     /**
      * The name of the logger we are wrapping.
      */
-    protected String name = null;
+    protected String name;
 
     // --------------------------------------------------------- Protected Methods
 

src/main/java/org/apache/commons/logging/impl/Log4JLogger.java

@@ -53,7 +53,7 @@ public class Log4JLogger implements Log, Serializable {
     private static final String FQCN = Log4JLogger.class.getName();
 
     /** Log to this logger */
-    private transient volatile Logger logger = null;
+    private transient volatile Logger logger;
 
     /** Logger name */
     private final String name;

src/main/java/org/apache/commons/logging/impl/LogFactoryImpl.java

@@ -202,7 +202,7 @@ public class LogFactoryImpl extends LogFactory {
      * This value is initialized by <code>getLogConstructor()</code>,
      * and then returned repeatedly.
      */
-    protected Constructor logConstructor = null;
+    protected Constructor logConstructor;
 
     /**
      * The signature of the Constructor to be used.
@@ -213,7 +213,7 @@ public class LogFactoryImpl extends LogFactory {
      * The one-argument <code>setLogFactory</code> method of the selected
      * {@link org.apache.commons.logging.Log} method, if it exists.
      */
-    protected Method logMethod = null;
+    protected Method logMethod;
 
     /**
      * The signature of the <code>setLogFactory</code> method to be used.

src/main/java/org/apache/commons/logging/impl/LogKitLogger.java

@@ -41,10 +41,10 @@ public class LogKitLogger implements Log, Serializable {
     // ------------------------------------------------------------- Attributes
 
     /** Logging goes to this <code>LogKit</code> logger */
-    protected transient volatile Logger logger = null;
+    protected transient volatile Logger logger;
 
     /** Name of this logger */
-    protected String name = null;
+    protected String name;
 
     // ------------------------------------------------------------ Constructor
 

src/main/java/org/apache/commons/logging/impl/SimpleLog.java

@@ -108,7 +108,7 @@ public class SimpleLog implements Log, Serializable {
      * in 1.1.1 to fix an existing thread safety bug (SimpleDateFormat.format
      * is not thread-safe).
      */
-    static protected DateFormat dateFormatter = null;
+    static protected DateFormat dateFormatter;
 
     // ---------------------------------------------------- Log Level Constants