I'm trying to start an application running in JBoss 4.0.5 that is to be a client to a JBoss Messaging server running JBoss 4.2.3, Messaging 1.4.0.SP3. I think I've worked out most of the classpath issues, and everything starts up without exception. I create the initial context with JNDI to connect to the messaging server, and have no problem coreating the connection factory. and connection. However, when I try to set an exception listener I get an NPE because the ClientConnectionDelegate has a null state. I've tried using the updated remoting jar, but that doesn't solve the problem. I have no problem running the messaging component of my application outside of the JBoss server, so I'm pretty sure the issue is somewhere either within my jboss config or with one of the client messaging jars I'm using. Anyone been able to resolve a similar issue? Thanks for any help. Details: Client Application: server running in JBoss 4.0.5 Messaging Server: JBoss v 4.2.3.GA WARNING: Exception in constructor java.lang.NullPointerException at org.jboss.jms.client.container.ConnectionAspect.getConnectionState(ConnectionAspect.java:254) at org.jboss.jms.client.container.ConnectionAspect.handleSetExceptionListener(ConnectionAspect.java:118) 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.aop.advice.PerInstanceAdvice.invoke(PerInstanceAdvice.java:130) at org.jboss.jms.client.delegate.ClientConnectionDelegate$setExceptionListener_8089029433030319178.invokeNext(ClientConnectionDelegate$setExceptionListener_8089029433030319178.java) at org.jboss.jms.client.container.ClosedInterceptor.invoke(ClosedInterceptor.java:170) at org.jboss.aop.advice.PerInstanceInterceptor.invoke(PerInstanceInterceptor.java:117) at org.jboss.jms.client.delegate.ClientConnectionDelegate$setExceptionListener_8089029433030319178.invokeNext(ClientConnectionDelegate$setExceptionListener_8089029433030319178.java) at org.jboss.jms.client.delegate.ClientConnectionDelegate.setExceptionListener(ClientConnectionDelegate.java) at org.jboss.jms.client.JBossConnection.setExceptionListener(JBossConnection.java:117) Client Jars included in classpath: jboss-remoting.jar - version 2.2.2.SP4 jboss-aop-jdk50.jar - version jboss-aop-1.5.2.GA jboss-messaging-client.jar - version 1.4.0.SP3 jbossall-client.jar - version 4.2.3.GA, stripped of all but the following packages javax.jms.*, org.apache.log4j.*, org.jboss.aop.*, org.jboss.aspects.*, org.jboss.injection.*, org.jboss.logging.*, org.jboss.remoting.*, org.jboss.util.* trove.jar - version 4.2.3.GA View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4215000#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...