How are you switching the JDK? When JBoss starts it prints out the version of Java being used. Something like: anonymous wrote : 19:16:33,193 INFO [ServerInfo] Java version: 1.5.0_13,Sun Microsystems Inc. | 19:16:33,193 INFO [ServerInfo] Java VM: Java HotSpot(TM) Client VM 1.5.0_13-b05,Sun Microsystems Inc. | 19:16:33,193 INFO [ServerInfo] OS-System: Windows XP 5.1,x86 | What does your logs show? And by the way, the link that you posted is an Wiki entry and not a bug entry. JBoss tracks its bugs through JIRA. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4101733#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...