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java.lang.IllegalStateException: Can't overwrite cause	at java.lang.Throwable.initCause(Throwable.java:320)	at org.jboss.mx.loading.RepositoryClassLoader.findClass(RepositoryClassLoader.java:624)	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)	at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:474)	at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)	at org.apache.log4j.spi.LoggingEvent.(LoggingEvent.java:159)	at org.apache.log4j.Category.forcedLog(Category.java:391)	at org.apache.log4j.Category.log(Category.java:856)	at sun.reflect.GeneratedMethodAccessor71.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.commons.logging.impl.Log4jProxy.log(Log4jProxy.java:301)	at org.apache.commons.logging.impl.Log4jProxy.warn(Log4jProxy.java:273)	at org.apache.commons.logging.impl.Log4JLogger.warn(Log4JLogger.java:185)	at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:117)	at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2009)	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292)	at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:713)	at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:127)	at org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:246)	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:597)	at org.jboss.ejb3.ServiceDelegateWrapper.startService(ServiceDelegateWrapper.java:103)	at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)	at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)	at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)	at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)	at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)	at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)	at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)	at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)	at $Proxy0.start(Unknown Source)	at org.jboss.system.ServiceController.start(ServiceController.java:417)	at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)	at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)	at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)	at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)	at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)	at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)	at $Proxy178.start(Unknown Source)	at org.jboss.ejb3.JmxKernelAbstraction.install(JmxKernelAbstraction.java:120)	at org.jboss.ejb3.Ejb3Deployment.startPersistenceUnits(Ejb3Deployment.java:627)	at org.jboss.ejb3.Ejb3Deployment.start(Ejb3Deployment.java:351)	at org.jboss.ejb3.Ejb3Module.startService(Ejb3Module.java:91)	at org.jboss.system.ServiceMBeanSupport.jbossInternalStart(ServiceMBeanSupport.java:289)	at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:245)	at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)	at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)	at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)	at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)	at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)	at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)	at $Proxy0.start(Unknown Source)	at org.jboss.system.ServiceController.start(ServiceController.java:417)	at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)	at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)	at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)	at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)	at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)	at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)	at $Proxy33.start(Unknown Source)	at org.jboss.ejb3.EJB3Deployer.start(EJB3Deployer.java:512)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)	at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)	at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)	at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)	at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)	at org.jboss.mx.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.java:97)	at org.jboss.system.InterceptorServiceMBeanSupport.invokeNext(InterceptorServiceMBeanSupport.java:238)	at org.jboss.wsf.container.jboss42.DeployerInterceptor.start(DeployerInterceptor.java:87)	at org.jboss.deployment.SubDeployerInterceptorSupport$XMBeanInterceptor.start(SubDeployerInterceptorSupport.java:188)	at org.jboss.deployment.SubDeployerInterceptor.invoke(SubDeployerInterceptor.java:95)	at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)	at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)	at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)	at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)	at $Proxy34.start(Unknown Source)	at org.jboss.deployment.MainDeployer.start(MainDeployer.java:1025)	at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:819)	at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782)	at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)	at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)	at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)	at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)	at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)	at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)	at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)	at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)	at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)	at $Proxy9.deploy(Unknown Source)	at org.jboss.deployment.scanner.URLDeploymentScanner.deploy(URLDeploymentScanner.java:421)	at org.jboss.deployment.scanner.URLDeploymentScanner.scan(URLDeploymentScanner.java:610)	at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.doScan(AbstractDeploymentScanner.java:263)	at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.loop(AbstractDeploymentScanner.java:274)	at org.jboss.deployment.scanner.AbstractDeploymentScanner$ScannerThread.run(AbstractDeploymentScanner.java:225)