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From "Ayyagari, Madhav" <Madhav.Ayyag...@sabre.com>
Subject Where is the fix for "org.apache.commons.logging.impl.Log4JCategoryLog does not implement Log" ?
Date Tue, 04 Nov 2003 20:54:29 GMT
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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