Hi, The standalone client works fine until I import the standalone code as a utility jar into a application running on Sun Application Server 8.2. I run into NoClassDefFound Exception again: Caused by: java.lang.NoClassDefFoundError at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate.createClient(ClientConnectionFactoryDelegate.java:298) at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate.org$jboss$jms$client$delegate$ClientConnectionFactoryDelegate$getClientAOPStack$aop(ClientConnectionFactoryDelegate.java:228) at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate.getClientAOPStack(ClientConnectionFactoryDelegate.java) at org.jboss.jms.client.delegate.ClientClusteredConnectionFactoryDelegate.org$jboss$jms$client$delegate$ClientClusteredConnectionFactoryDelegate$getClientAOPStack$aop(ClientClusteredConnectionFactoryDelegate.java:242) at org.jboss.jms.client.delegate.ClientClusteredConnectionFactoryDelegate.getClientAOPStack(ClientClusteredConnectionFactoryDelegate.java) at org.jboss.jms.client.ClientAOPStackLoader.load(ClientAOPStackLoader.java:75) at org.jboss.jms.client.JBossConnectionFactory.createConnectionInternal(JBossConnectionFactory.java:192) at org.jboss.jms.client.JBossConnectionFactory.createConnection(JBossConnectionFactory.java:87) at jmsremoteclient.TestMessageProducer.(TestMessageProducer.java:43) TestMessageProducer is the class where I try to initiate the connection to JBM. The exception doesn't suggest the class name and therefore made it harder to debug. (I did included log4j.jar) Any suggestions? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4224771#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...