JMS / WL 5.1 app using Topic on WL 7.0 Cluster

[scott lauder]

I have WL 5.1 app using Topic. I moved the Topic over to WL 7.0 Cluster.

Now getting error (same as samples):
examples.jms.topic.TopicReceive t3://10.10.7.20:7001
javax.naming.CommunicationException. Root exception is java.net.ConnectException: No server found at T3://10.10.7.20:7001
at weblogic.rjvm.RJVMFinder.findOrCreate(RJVMFinder.java:161)
at weblogic.rjvm.ServerURL.findOrCreateRJVM(ServerURL.java:200)
at weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialContextFactoryDelegate.java:195)
at weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialContextFactoryDelegate.java:148)
at weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialContextFactory.java:123)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:665)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:246)
at javax.naming.InitialContext.init(InitialContext.java:222)
at javax.naming.InitialContext.<init>(InitialContext.java:198)
at examples.jms.topic.TopicReceive.getInitialContext(TopicReceive.java:143)
at examples.jms.topic.TopicReceive.main(TopicReceive.java:119)

Works stand alone with new WL 7.0 JARS,
but not with old 5.1 jars. What to do in WL 5.1 app?