I was having this same issue until I discovered that one of my third party jars was corrupt. When I would make a request that included a custom tag in the response (the first time the custom tag was accessed) all of my jars were being searched/scanned until the tag library was found. Once I fixed the corrupt jar, this issue went away. I tested all of my jars, by trying to unjar them, via jar xvf * I hope this helps. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3983937#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...