User development, A new message was posted in the thread "JBoss 5.1 -> 4.2 compatibility: javax.naming.Reference cannot be cast to javax.jms.Queue": http://community.jboss.org/message/527976#527976 Author : Michał Borowiecki Profile : http://community.jboss.org/people/mihbor Message: -------------------------------------------------------------- Hi,   We're trying to to lookup a JMS Queue that resides on JBoss-4.2.2 from an ear deployed in JBoss 5.1.0 (specifically sar packaged inside and ear) We are getting:   java.lang.ClassCastException: javax.naming.Reference cannot be cast to javax.jms.Queue         at pl.bluepay.utils.jms.MDBUtil.getQueue(MDBUtil.java:56)   I understand this is related to incompatible changes in the client libs between the versions. We tried putting jbossall-client.jar from JBoss-4.2.2 inside the ear (classloader isolation is enabled in the ear-deployer), and referenced it from the sar's MANIFEST file, but this caused the thread to hang.   Does anybody know a solution? -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/527976#527976