You did not say which operating system you are running. Is it Windows? Are you running with the /3GB boot option? If so, then the operating system does not have enough memory to allocate the data structures it needs to manage another thread. You will have to reboot without the /3GB option. If you are on Linux, it has a similar option, but I don't know what it is off-hand. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4154770#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...