Peter, Adding log4j.jar causes exception in the ConnectionFactory lookup which is before where the other exception happens. Exception in thread "main" java.lang.NoSuchFieldError: TRACE at org.jboss.logging.Log4jLoggerPlugin.isTraceEnabled(Log4jLoggerPlugin.java:85) I removed the log4j.jar and I have added verbose:class in my run command but the log doesn't show much insight for me: [Loaded org.jboss.aop.advice.org.jboss.jms.client.container.StateCreationAspect_z_handleCreateSessionDelegate_1027049 from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded org.jboss.jms.client.container.SessionAspect from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded org.jboss.jms.delegate.Ack from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded javax.jms.IllegalStateException from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded javax.jms.TransactionInProgressException from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded org.jboss.jms.delegate.Cancel from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded org.jboss.jms.client.state.HierarchicalStateSupport from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded org.jboss.jms.client.state.SessionState from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded org.jboss.jms.delegate.DeliveryInfo from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded org.jboss.aop.advice.org.jboss.jms.client.container.SessionAspect_z_handleCreateConnectionConsumer_1027049 from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded org.jboss.jms.client.remoting.ConsolidatedRemotingConnectionListener from file:/C:/JMSRemoteClient/lib/jbossall-client.jar] [Loaded sun.reflect.GeneratedMethodAccessor1 from __JVM_DefineClass__] Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class org.jboss.remoting.util.TimerUtil at org.jboss.remoting.ConnectionValidator.start(ConnectionValidator.java:503) TimerUtil is in jboss-remoting.jar as well as jbossall-client.jar. I am not sure why the JVM couldn't find. (My JVM is 1.6. If I switch to 1.5, I get NoClassDefFoundError exception at the same place but without the message suggesting the missing class name). Tim, I think the client jar is the right version because I am able to use the same set of jars to connect to the JBM queue via Hermes. Not sure why a standalone java client would act any difference... View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4224441#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...