Hi mk, I am assuming that you are trying to replace the tomcat 55.sar because you want to run the JSPs having J2SE 1,5 syntax. For doing that, you can just replace the jasper compiler instead of replacing the whole sar. All you have to do is - copy jasper-compiler.jar, jasper-compiler-jdt.jar and jasper-runtime.jar from jbossweb-tomcat55.sar into jbossweb-tomcat50.sar. Warm regards, Abhinav http://abhinavmaheshwari.blogspot.com View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4061367#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...