Hello, I have developed a very simple MDB to test with JBoss Messaging 1.2/JBoss 4.0.5GA. When JBoss came up, it complained about JMS activation with the following warning and then error: (as you can see in this log, a queue was created, a MDB was started and then a warning and an exception) anonymous wrote : ..... | 13:30:29,578 INFO [ServerPeer] JBoss Messaging 1.2.0.GA server [0] started | ..... | 13:26:06,281 INFO [QueueService] Queue[/queue/marketData] started, fullSize=200000, pageSize=2000, downCacheSize=2000 | ..... | 13:30:33,390 INFO [EJBContainer] STARTED EJB: com.judots...QuoteBroadcastListener ejbName: QuoteBroadcastListener | ..... | 13:30:33,765 INFO [Server] JBoss (MX MicroKernel) [4.0.5.GA (build: CVSTag=Branch_4_0 date=200610162339)] Started in 22s:375ms | 13:30:34,484 WARN [JmsActivation] Failure in jms activation org.jboss.resource.adapter.jms.inflow.JmsActivationSpec@e458c2(ra=org.jboss.resource.adapter.jms.JmsResourceAdapter(a)6bf551 destination=/queue/marketData isTopic=false tx=true durable=false reconnect=10 provider=java:/DefaultJMSProvider user=null maxMessages=1 minSession=1 maxSession=15 keepAlive=60000 useDLQ=true DLQHandler=org.jboss.resource.adapter.jms.inflow.dlq.GenericDLQHandler DLQJndiName=queue/DLQ DLQUser=null DLQMaxResent=10) | java.lang.RuntimeException: java.lang.ClassNotFoundException: No ClassLoaders found for: org.jboss.jms.client.container.ClosedInterceptor | .... | Caused by: java.lang.ClassNotFoundException: No ClassLoaders found for: org.jboss.jms.client.container.ClosedInterceptor | at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:212) | ...... | Any help is greatly appreciated. Thanks -tony View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4028945#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...