I have installed ESB 4.2MR2 (w/JBM 1.2.0sp1) which has several default JMS queues. I am trying to send a message to queue/A from a Java 1.5.0_12 app and an getting this error:
javax.naming.CommunicationException [Root exception is java.lang.ClassNotFoundException: org.jboss.jms.client.JBossConnectionFactory]
Please disregard this message. I discovered my problem to be mixing jars from a AS 4.0.5 with the ESB 4.2MR2. There are definitely some differences there.