Two possibilities. First, get the JDK out of Program Files, having spaces in the path tends to give some Java libraries fits. You do not have to reinstall, just copy c:\program files\Java\jdk1.5.0_06 as c:\jdk1.5.0_06 and set JAVA_HOME to c:\jdk1.5.0_06. If that doesn't do the trick, then reinstall JBossAS by downloading the binary zip file again and unzipping it. (I have seen posts similar to your many times in the forums and reinstalling usually does the trick.) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4139863#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...