I'm new to JMS and MDB.
I'm following up the JMS tutorial from from java.sun.com, and I am using JBoss 3.0.6 as App Server.
When I run the example SimpleQueueSender, I get the following error:

Exception in thread "main" java.lang.NoClassDefFoundError: EDU/oswego/cs/dl/util
/concurrent/ThreadFactory
at org.jboss.mq.SpyConnectionFactory.createQueueConnection(SpyConnection
Factory.java:116)
at SimpleQueueSender.main(SimpleQueueSender.java:90)

Please help me!
(My lookup process has completed)