Are you asking how to get JSPs to compile using a 5.0 compiler? If so, try adding the compilerTargetVM and compilerSourceVM parameters to the jsp servlet in server/xxx/deploy/jboss-web.deployer/conf/web.xml file. Actually, I am surprised that 4.2.1 does not have the 1.5 compiler set by default (the source shows 1.4 as the default, still). View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4090734#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...