Hmmmm. This anonymous wrote : | ERROR [MessageCallbackHandler] RuntimeException was thrown from onMessage, 90625 will be redelivered | Tells me that the JCA layer/MDB container is *not* calling onMessage directly (since this is logged from JBM), therefore JMS semantics do apply, and we need to follow the JMS spec. So, yes please Tomasz, please replicate in a simple test case/test program and we will investigate further. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3982353#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...