[jboss-user] Re: Stateless Session Bean - java.lang.reflect.UndeclaredThrowab

See Thread at: http://www.techienuggets.com/Detail?tx=11297 Posted on behalf of a User I am also experiencing this problem, using JBoss 4.2.0, Seam 2.0: it happens intermittently while the application runs, and attempting the same action again always works... Caused by: java.lang.InstantiationException: org.apache.log4j.Logger at java.lang.Class.newInstance0(Unknown Source) at java.lang.Class.newInstance(Unknown Source) at org.jboss.serial.classmetamodel.ClassMetaData.newInstance(ClassMetaData.java:334) at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:239) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:412) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:643) at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353) at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273) at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:412) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:643) at org.jboss.serial.persister.ArrayPersister.readObjectArray(ArrayPersister.java:196) at org.jboss.serial.persister.ArrayPersister.readData(ArrayPersister.java:172) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:412) at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:643) at org.jboss.serial.io.JBossObjectInputStream.readObjectOverride(JBossObjectInputStream.java:163) at java.io.ObjectInputStream.readObject(Unknown Source) at org.jboss.serial.io.MarshalledObject.get(MarshalledObject.java:68) at org.jboss.ejb3.stateful.StatefulBeanContext.extractBeanAndInterceptors(StatefulBeanContext.java:790) at org.jboss.ejb3.stateful.StatefulBeanContext.getInterceptorInstances(StatefulBeanContext.java:778) at org.jboss.ejb3.interceptor.LifecycleInvocationContextImpl.getLifecycleInvocationContext(LifecycleInvocationContextImpl.java:65) at org.jboss.ejb3.interceptor.LifecycleInterceptorHandler.postActivate(LifecycleInterceptorHandler.java:143) at org.jboss.ejb3.stateful.StatefulContainer.invokePostActivate(StatefulContainer.java:400) at org.jboss.ejb3.stateful.StatefulBeanContext.postActivate(StatefulBeanContext.java:385) at org.jboss.ejb3.cache.simple.StatefulSessionFilePersistenceManager.activateSession(StatefulSessionFilePersistenceManager.java:316) at org.jboss.ejb3.cache.simple.SimpleStatefulCache.get(SimpleStatefulCache.java:387) at org.jboss.ejb3.cache.simple.SimpleStatefulCache.get(SimpleStatefulCache.java:375) at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulInstanceInterceptor.java:61) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77) at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:106) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateful.StatefulContainer.dynamicInvoke(StatefulContainer.java:333) at org.jboss.ejb3.remoting.IsLocalInterceptor.invokeLocal(IsLocalInterceptor.java:81) at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:72) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateful.StatefulRemoteProxy.invoke(StatefulRemoteProxy.java:139) at $Proxy118.getAccountDTO(Unknown Source) at au.com.demand.portal.flex.QuoteOrderDataProviderBean.findAggregationAddresses(QuoteOrderDataProviderBean.java:71) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112) at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166) at org.jboss.seam.intercept.EJBInvocationContext.proceed(EJBInvocationContext.java:44) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) at org.granite.tide.seam.TideInterceptor.aroundInvoke(TideInterceptor.java:140) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:31) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.persistence.EntityManagerProxyInterceptor.aroundInvoke(EntityManagerProxyInterceptor.java:26) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.persistence.HibernateSessionProxyInterceptor.aroundInvoke(HibernateSessionProxyInterceptor.java:27) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) at org.jboss.seam.intercept.SessionBeanInterceptor.aroundInvoke(SessionBeanInterceptor.java:50) at sun.reflect.GeneratedMethodAccessor399.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:118) at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79) at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:94) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:62) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77) at org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:106) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106) at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:214) at org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:184) at org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:81) at $Proxy330.findAggregationAddresses(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.seam.util.Reflections.invoke(Reflections.java:21) at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31) at org.jboss.seam.intercept.ClientSideInterceptor$1.proceed(ClientSideInterceptor.java:76) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) at org.jboss.seam.intercept.ClientSideInterceptor.invoke(ClientSideInterceptor.java:54) at org.javassist.tmp.java.lang.Object_$$_javassist_2.findAggregationAddresses(Object_$$_javassist_2.java) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.granite.messaging.service.ServiceInvocationContext.invoke(ServiceInvocationContext.java:70) at org.granite.messaging.service.security.AbstractSecurityService.endAuthorization(AbstractSecurityService.java:42) at org.granite.seam.security.SeamSecurityService.authorize(SeamSecurityService.java:88) at org.granite.messaging.service.ServiceInvoker.invoke(ServiceInvoker.java:132) ... 46 more In Response To: Hi , When i am accessing a stateless session bean methods in a servlet i am able to access some methods without any problem. But some methods are throwing the following error. I am not able to find oput why it is hapening with only some methods. The error is as follows: java.lang.reflect.UndeclaredThrowableException 2007-08-28 16:21:31,765 ERROR STDERR - at $Proxy458.getUserResource(Unknown Source) 2007-08-28 16:21:31,765 ERROR STDERR - at com.ecc.login.servlets.HomePage.login(HomePage.java:569) 2007-08-28 16:21:31,765 ERROR STDERR - at com.ecc.login.servlets.HomePage.doPost(HomePage.java:131) 2007-08-28 16:21:31,765 ERROR STDERR - at javax.servlet.http.HttpServlet.service(HttpServlet.java:710) 2007-08-28 16:21:31,765 ERROR STDERR - at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580) 2007-08-28 16:21:31,765 ERROR STDERR - at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) 2007-08-28 16:21:31,765 ERROR STDERR - at java.lang.Thread.run(Thread.java:595) 2007-08-28 16:21:31,765 ERROR STDERR - Caused by: java.io.IOException 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.readSlotWithMethod(RegularObjectPersister.java:107) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:269) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:412) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:845) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.io.MarshalledObjectForLocalCalls.get(MarshalledObjectForLocalCalls.java:60) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.ejb3.remoting.IsLocalInterceptor.invokeLocal(IsLocalInterceptor.java:94) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:70) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:103) 2007-08-28 16:21:31,765 ERROR STDERR - ... 23 more 2007-08-28 16:21:31,765 ERROR STDERR - Caused by: java.lang.reflect.InvocationTargetException 2007-08-28 16:21:31,765 ERROR STDERR - at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 2007-08-28 16:21:31,765 ERROR STDERR - at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 2007-08-28 16:21:31,765 ERROR STDERR - at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 2007-08-28 16:21:31,765 ERROR STDERR - at java.lang.reflect.Method.invoke(Method.java:585) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.readSlotWithMethod(RegularObjectPersister.java:103) 2007-08-28 16:21:31,765 ERROR STDERR - ... 33 more 2007-08-28 16:21:31,765 ERROR STDERR - Caused by: org.jboss.serial.exception.SerializationException: Could not create instance of org.apache.log4j.Logger - org.apache.log4j.Logger 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.classmetamodel.ClassMetaData.newInstance(ClassMetaData.java:342) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:239) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:412) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:845) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:412) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:845) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:412) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:845) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.ArrayPersister.readObjectArray(ArrayPersister.java:196) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.ArrayPersister.readData(ArrayPersister.java:172) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:412) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:845) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:412) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:82) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.objectmetamodel.DataContainer$DataContainerInput.readObject(DataContainer.java:845) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.persister.ObjectInputStreamProxy.readObjectOverride(ObjectInputStreamProxy.java:68) 2007-08-28 16:21:31,765 ERROR STDERR - at java.io.ObjectInputStream.readObject(ObjectInputStream.java:342) 2007-08-28 16:21:31,765 ERROR STDERR - at java.util.Hashtable.readObject(Hashtable.java:848) 2007-08-28 16:21:31,765 ERROR STDERR - ... 38 more 2007-08-28 16:21:31,765 ERROR STDERR - Caused by: java.lang.InstantiationException: org.apache.log4j.Logger 2007-08-28 16:21:31,765 ERROR STDERR - at java.lang.Class.newInstance0(Class.java:335) 2007-08-28 16:21:31,765 ERROR STDERR - at java.lang.Class.newInstance(Class.java:303) 2007-08-28 16:21:31,765 ERROR STDERR - at org.jboss.serial.classmetamodel.ClassMetaData.newInstance(ClassMetaData.java:334) 2007-08-28 16:21:31,765 ERROR STDERR - ... 68 more can anybody suggests any solution. I am using JBoss4.2.0 & JDK5.0. Thanks in advance.