I used jboss-messaging-clients.jar of 1.2.0.GA to call configuration of 1.2.0SP1 and I got following error. 2007-04-03 10:08:41,318 ERROR [org.jboss.remoting.transport.socket.ServerThread] - Worker thread initialization failure | java.io.IOException: Can not read data for version 22. Supported versions: 1,2 | at org.jboss.remoting.transport.socket.ServerThread.versionedRead(ServerThread.java:649) | at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:523) | at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:363) | at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:159) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4034212#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...