Hi PeterJ, Thanks for your help. I had used "exploded war", but I didn't achieve the goal. Namely, when JBoss was running, I modified any JSP file, JBoss didn't re-deploy the web application. And as the instructions, I have to modify web.xml (In fact, that's true with my tests). anonymous wrote : I have successfully updated JSPs when using such a deployment.I'm very curious that why your JSP files could be updated. a cup of Java, cheers! Sha Jiang View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4036259#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...