There is no way to do this within JBoss AS itself. However, the run script is, after all, just a script. You can modify the script to test if another instance is running first, either by examining the existing processes or using a "lock" file. How you do either of those depends on the operating system. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4198354#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...