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Date: Tue, 04 Nov 2003 19:03:52 -0800
From: __matthewHawthorne <matth@phreaker.net>
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To: Jakarta Commons Users List <commons-user@jakarta.apache.org>
Subject: Re: Where is the fix for
 "org.apache.commons.logging.impl.Log4JCategoryLog
 does not implement Log" ?
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What version of log4j are you using?  I've had problems running 
commons-logging 1.0.3 with log4j 1.1.3.  I then switched to 
commons-logging 1.0.2 and it worked fine.


Ayyagari, Madhav wrote:
> Hi All,
> 
> I tried using both commons-logging.jar 1.0.2 and 1.0.3 versions without any success for the following problem:
> 
> [jdoc] java.lang.ExceptionInInitializerError
> [jdoc]     at java.lang.Class.forName0(Native Method)
> [jdoc]     at java.lang.Class.forName(Class.java:217)
> [jdoc]     at com.solarmetric.kodo.util.MultiLoaderClassResolver.resolveClass(MultiLoaderClassResolver.java:84)
> [jdoc]     at com.solarmetric.modules.tools.compiler.ClassArgParser.parseClasses(ClassArgParser.java:67)
> [jdoc]     at com.solarmetric.kodo.enhance.JDOEnhancer.enhance(JDOEnhancer.java:175)
> [jdoc]     at com.solarmetric.kodo.enhance.JDOEnhancer.enhance(JDOEnhancer.java:135)
> [jdoc]     at com.solarmetric.modules.integration.ant.JDOEnhancerTask.executeOn(JDOEnhancerTask.java:43)
> [jdoc]     at com.solarmetric.modules.integration.ant.TaskBase.execute(TaskBase.java:118)
> [jdoc]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:166)
> [jdoc]     at org.apache.tools.ant.Task.perform(Task.java:319)
> [jdoc]     at org.apache.tools.ant.Target.execute(Target.java:309)
> [jdoc]     at org.apache.tools.ant.Target.performTasks(Target.java:336)
> [jdoc]     at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
> [jdoc]     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:371)
> [jdoc]     at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:143)
> [jdoc]     at org.apache.tools.ant.Task.perform(Task.java:319)
> [jdoc]     at org.apache.tools.ant.Target.execute(Target.java:309)
> [jdoc]     at org.apache.tools.ant.Target.performTasks(Target.java:336)
> [jdoc]     at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
> [jdoc]     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:371)
> [jdoc]     at org.apache.tools.ant.Task.perform(Task.java:319)
> [jdoc]     at org.apache.tools.ant.Target.execute(Target.java:309)
> [jdoc]     at org.apache.tools.ant.Target.performTasks(Target.java:336)
> [jdoc]     at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
> [jdoc]     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:371)
> [jdoc]     at org.apache.tools.ant.Task.perform(Task.java:319)
> [jdoc]     at org.apache.tools.ant.Target.execute(Target.java:309)
> [jdoc]     at org.apache.tools.ant.Target.performTasks(Target.java:336)
> [jdoc]     at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
> [jdoc]     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:371)
> [jdoc]     at org.apache.tools.ant.Task.perform(Task.java:319)
> [jdoc]     at org.apache.tools.ant.Target.execute(Target.java:309)
> [jdoc]     at org.apache.tools.ant.Target.performTasks(Target.java:336)
> [jdoc]     at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
> [jdoc]     at org.apache.tools.ant.Project.executeTargets(Project.java:1250)
> [jdoc]     at org.apache.tools.ant.Main.runBuild(Main.java:610)
> [jdoc]     at org.apache.tools.ant.Main.start(Main.java:196)
> [jdoc]     at org.apache.tools.ant.Main.main(Main.java:235)
> [jdoc]     org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: Class org.apache.commons.logging.impl.Log4JCategoryLog does not implement Log
> [jdoc]     at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:555)
> [jdoc]     at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:289)
> [jdoc]     at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:259)
> [jdoc]     at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:390)
> 
> The class on which the failure happening has code something like this:
> 
> import org.apache.commons.logging.Log;
> import org.apache.commons.logging.LogFactory;
> 
> public class MyClass
> {
>    private final static Log log = LogFactory.getLog(MyClass.class);
> }
> 
> Ofcourse the CLASSPATH environmental variable on solaris unix has both log4j.jar and commons-logging.jar in it.
> 
> I searched internet but couldnt find any conclusive fix for this. As suggested online it looks like a class loader problem. 
> 
> Any help is greatly appreciated.
> 
> Madhav:~


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