Using jboss-4.0.5.GA, Spring 2.0.2, WebSphere MQ 6.0. Running a deployed countries.war Spring Sample with modifications to start up a DefaultMessageListenerContainer in it. Finds TransactionManager @ java:/TransactionManager. Problem when getting UserTransaction @ java:comp/UserTransaction. StackTrace Caused by: org.springframework.jndi.TypeMismatchNamingExcepti on: Object [org.jboss.tm.usertx.client.ServerVMClientUserTrans action@65b778] available at JNDI location [java:comp/UserTransaction] is not assignable to [javax.transaction.UserTransaction] Question: ServerVMClientUserTransaction implements javax.transaction.UserTransaction but it is not assignable as such by spring... I do not get this error in WebSphere 5.1. but, then it uses a different approach in the wiring up of a JtaTransaction. Perhaps this is a jboss configuration issue, .war assembly issue, etc. (classpath) but have not resolved yet. JBoss was just installed - no configuration changes except copying default into my own name and running under that name as my server. Spring jar files and mq jar files loaded under WEB-INF/lib. I'd appreciate whatever help you guys might be able to provide on this and I will post back when I stumble across the fix.... Thanks David View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4026406#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...