Which patch release of the JVM are you running? Is it the original 1.5? I am running patch release 6 (1.5.0_06). I googled thep roblem and it seems that others have had problems with running JBoss on earlier versions of 1.5. I have run 3.2.7, 4.0.2, 4.0.3SP1 and 4.0.4 on JVM 1.5.0_06 without problems. Also, set JAVA_HOME to the JDK, not to the JRE. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3960437#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...