An "unable to create new native thread" error usually indicates that the operating system ran out of memory (in other words, this is not a the-JVM-heap-is-full message). How much RAM do you have? How much swap space? Is it a 32-bit or 64-bit OS? If 32-bit OS, are you running with an option to allocate 3GB of user memory? What is the memory usage on the system (how much free memory)? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4141434#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...