Hi, 

we are trying to deploy an ear-packaged application on jboss. Since several 
libs are used in different versions as the ones shipped with jboss 
(jboss-4.0.3SP1) - especially the Dom4j stuff - we turned on isolated 
deployment. When looking into the JMX-Console and checking from where a class 
is loaded I can't see any errors. Unfortunately the errors we are encountering 
suggest that the classloader is mixing two versions. As I could read while 
googling, there seems to be some special treatment of loging classes. Cuold you 
please geive me a hint of what is causing the following exceptions?

2006-01-31 15:59:41,534 ERROR [org.apache.commons.digester.Digester] Begin 
event threw exception
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.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:246)
        at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:398)
        at org.apache.catalina.session.ManagerBase.(ManagerBase.java:63)
        at org.apache.catalina.session.StandardManager.(StandardManager.java:64)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at 
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at 
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
        at java.lang.Class.newInstance0(Class.java:308)
        at java.lang.Class.newInstance(Class.java:261)
        at 
org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRule.java:205)
        at org.apache.tomcat.util.digester.Rule.begin(Rule.java:152)
        at 
org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1275)
        at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown 
Source)
        at 
org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
        at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown 
Source)
        at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
 Source)
        at 
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown 
Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
        at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
        at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
        at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown 
Source)
        at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1561)
        at 
org.apache.catalina.startup.ContextConfig.processContextConfig(ContextConfig.java:778)
        at 
org.apache.catalina.startup.ContextConfig.contextConfig(ContextConfig.java:714)
        at 
org.apache.catalina.startup.ContextConfig.init(ContextConfig.java:974)
        at 
org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:273)
        at 
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
        at 
org.apache.catalina.core.StandardContext.init(StandardContext.java:5019)
        at 
org.apache.catalina.core.StandardContext.start(StandardContext.java:3885)
        at 
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
        at 
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:739)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:524)
        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)
        at 
org.jboss.mx.server.RawDynamicInvoker.invoke(RawDynamicInvoker.java:150)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
        at 
org.apache.catalina.core.StandardContext.init(StandardContext.java:5005)
        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)
        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:280)
        at 
org.jboss.web.tomcat.tc5.TomcatDeployer.performDeploy(TomcatDeployer.java:88)
        at org.jboss.web.AbstractWebDeployer.start(AbstractWebDeployer.java:357)
        at org.jboss.web.WebModule.startModule(WebModule.java:68)
        at org.jboss.web.WebModule.startService(WebModule.java:46)
        at 
org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:274)
        at 
org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:230)
        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
        at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
        at 
org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:943)
        at $Proxy0.start(Unknown Source)
        at org.jboss.system.ServiceController.start(ServiceController.java:428)
        at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
        at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
        at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
        at $Proxy30.start(Unknown Source)
        at 
org.jboss.web.AbstractWebContainer.start(AbstractWebContainer.java:400)
        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.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
        at 
org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:118)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
        at 
org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:127)
        at 
org.jboss.mx.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.java:80)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
        at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
        at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
        at $Proxy31.start(Unknown Source)
        at org.jboss.deployment.MainDeployer.start(MainDeployer.java:989)
        at org.jboss.deployment.MainDeployer.start(MainDeployer.java:979)
        at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:790)
        at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:753)
        at sun.reflect.GeneratedMethodAccessor51.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
        at 
org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:118)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
        at 
org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:127)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
        at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
        at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
        at $Proxy9.deploy(Unknown Source)
        at 
org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:319)
        at 
org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:507)
        at 
org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:192)
        at 
org.jboss.deployment.scanner.AbstractDeploymentScanner.startService(AbstractDeploymentScanner.java:265)
        at 
org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:274)
        at 
org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:230)
        at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
        at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
        at 
org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:943)
        at $Proxy0.start(Unknown Source)
        at org.jboss.system.ServiceController.start(ServiceController.java:428)
        at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
        at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
        at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
        at $Proxy4.start(Unknown Source)
        at org.jboss.deployment.SARDeployer.start(SARDeployer.java:285)
        at org.jboss.deployment.MainDeployer.start(MainDeployer.java:989)
        at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:790)
        at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:753)
        at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:737)
        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.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
        at 
org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:118)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
        at 
org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:127)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:74)
        at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:245)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
        at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:176)
        at $Proxy5.deploy(Unknown Source)
        at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:453)
        at org.jboss.system.server.ServerImpl.start(ServerImpl.java:330)
        at org.jboss.Main.boot(Main.java:187)
        at org.jboss.Main$1.run(Main.java:438)
        at java.lang.Thread.run(Thread.java:534)
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)
        ... 162 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)
        ... 163 more


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