I'm no specialist, but the return type of isAlive is void.... So afaics this is perfectly correct. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4082088#4082088 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4082088