We use 1.5, so yes I have the JDK 1.5 rt.jar on my classpath - does JBoss messaging require Java 1.4? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3972954#3972954 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=3972954