Yes, you can use the Run > Attach Debugger... menu to attach the debugger to a running process. Before that, you need to start JBoss with the appropriate debug parameters, see JBoss or JDK documentation for exact steps. BTW, note that there are some bugs with the NB 5.5 + JBoss 4.0.5 combination, you should use NB 5.5.1 RC with JBoss 4.0.5. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4041892#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...