"jaikiran" wrote : Which version of JBoss do you use? For JBoss-4.2.x, you will have to start the server using the -b option. See this for details http://wiki.jboss.org/wiki/Wiki.jsp?page=JBoss42FAQ Oh man! Problem solved by just starting JBoss with the -b option. I can't imagine that I just wasted a whole day for the "-b"!! I'm using JBoss AS 4.2.3.GA Release. Thanks a lot jaikiran! But another 2 questions here: 1. What is the problem of "unprotected Instances of JBoss"? 2. It takes about 3 seconds to call the remote method once, any way to accelerate the speed? I'm using a LAN system, I believe there're ways to make the callings much faster than 3 seconds. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4179368#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...