[Jboss-dev-forums] [Deployers on JBoss (Deployers/JBoss)] - Re: Reasons for Parent-first vs. Child-first classloading

[n2 <nu...@jb...>]

Hello,

i have a problem that i related to your topic. 
My environment: Cluster with two Servers. SuSE Linux Enterprise Server 8, SUN JDK 1.4.2, JBoss 4.0.2, I use the all configuration and made it J2EE 1.4 compatible.

My app has the following structure:
JFleet.ear
  |   |
  |   +-...
  |   +-avww.war
  |         |
  |         +-...
  |         +-WEB-INF
  |              |
  |              +-...
  |              +-lib
  |                  |
  |                  +-..
  |                  +-commons-logging-1.2.8.jar
  |                  +-log4j-1.2.8.jar

When i deploy it i get the an error:
org.apache.commons.logging.LogConfigurationException: Class org.apache.commons.logging.impl.Log4JLogger does not implement Log
  |         at org.apache.commons.modeler.BaseModelMBean.invoke(BaseModelMBean.java:511)
  |         at org.jboss.mx.server.RawDynamicInvoker.invoke(RawDynamicInvoker.java:150)
  |         at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
  |         at org.jboss.web.tomcat.tc5.TomcatDeployer.performDeployInternal(TomcatDeployer.java:274)
  |         at org.jboss.web.tomcat.tc5.TomcatDeployer.performDeploy(TomcatDeployer.java:91)
  |         at org.jboss.web.AbstractWebDeployer.start(AbstractWebDeployer.java:357)
  |         ... 49 more
  | Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: Class org.apache.commons.logging.impl.Log4JLogger does not implement Log
  |         at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:532)
  |         at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:272)
  |         at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:414)
  |         at org.apache.catalina.core.ContainerBase.getLogger(ContainerBase.java:380)
  |         at org.apache.catalina.core.StandardContext.filterStop(StandardContext.java:3563)
  |         at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4249)
  |         at org.apache.catalina.core.ContainerBase.destroy(ContainerBase.java:1131)
  |         at org.apache.catalina.core.StandardContext.destroy(StandardContext.java:4358)
  |         at org.apache.catalina.core.StandardContext.init(StandardContext.java:5008)
  |         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  |         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  |         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |         at java.lang.reflect.Method.invoke(Method.java:324)
  |         at org.apache.commons.modeler.BaseModelMBean.invoke(BaseModelMBean.java:503)
  |         ... 54 more
  | Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: Class org.apache.commons.logging.impl.Log4JLogger does not implement Log
  |         at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:416)
  |         at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:525)
  |         ... 67 more
  | Caused by: org.apache.commons.logging.LogConfigurationException: Class org.apache.commons.logging.impl.Log4JLogger does not implement Log
  |         at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:412)
  |         ... 68 more

This i really strange because class org.apache.commons.logging.impl.Log4JLogger is part of commons logging and of course implements interface Log.

Here is the code  of commons logging LogFactoryImpl where the error occured:
protected Constructor getLogConstructor()
  |         throws LogConfigurationException {
  |         // Return the previously identified Constructor (if any)
  |         if (logConstructor != null) {
  |             return logConstructor;
  |         }
  |         String logClassName = getLogClassName();
  |         // Attempt to load the Log implementation class
  |         Class logClass = null;
  |         try {
  |             logClass = loadClass(logClassName);
  |             if (logClass == null) {
  |                 throw new LogConfigurationException
  |                     ("No suitable Log implementation for " + logClassName);
  |             }
  |        if (!Log.class.isAssignableFrom(logClass)) {
  |                 throw new LogConfigurationException
  |                     ("Class " + logClassName + " does not implement Log");
  |             }
  |         } catch (Throwable t) {
  |             throw new LogConfigurationException(t);
  |         }
  |         ...
I think logClassName i loaded by i different class loader than class Log. 

I tried to add a jboos-app.xml tom y ear: <?xml version="1.0"?>
  | <jboss-app>
  |   <loader-repository> 
  |     cob.akuratus.com:loader=JFleet-1.10.4.ear
  |     <loader-repository-config> 
  |       java2ParentDelegation=false 
  |     </loader-repository-config> 
  |   </loader-repository> 
  | </jboss-app> but it does not help. 
Can you help me?

Daniel.

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