Ensure an ExceptionInInitializerError occurs when trying to create an instance

of these classes in pre-1.4 JVMs. Without this, an InvocationTargetException
could be thrown when calling the constructor but that could also be caused
by a number of other reasons which we don't want to ignore.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/logging/trunk@179529 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -57,6 +57,14 @@ public class Jdk13LumberjackLogger implements Log, Serializable {
     private boolean classAndMethodFound = false;
 
 
+    /**
+     * This member variable simply ensures that any attempt to initialise
+     * this class in a pre-1.4 JVM will result in an ExceptionInInitializerError.
+     * It must not be private, as an optimising compiler could detect that it
+     * is not used and optimise it away.
+     */
+    protected static final Level dummyLevel = Level.FINE;
+
     // ----------------------------------------------------------- Constructors
 
 

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

@@ -38,6 +38,13 @@ import org.apache.commons.logging.Log;
 
 public class Jdk14Logger implements Log, Serializable {
 
+    /**
+     * This member variable simply ensures that any attempt to initialise
+     * this class in a pre-1.4 JVM will result in an ExceptionInInitializerError.
+     * It must not be private, as an optimising compiler could detect that it
+     * is not used and optimise it away.
+     */
+    protected static final Level dummyLevel = Level.FINE;
 
     // ----------------------------------------------------------- Constructors