Try moving JBossAS out of the "Application Servers" directory. Spaces in path names tends to confuse various Java libraries. Also, try upgrading to the latest 1.5 JDK (1.5.0_15, I think). If none of that works, you might have to redownload and reinstall (usually when strange things like this happen reinstalling seems to be the only thing that solves the problems.) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4140211#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...