Hi Wolfgang, the Show.war contains a file META/MANIFEST.MF, but has the following content: Manifest-Version: 1.0 Ant-Version: Apache Ant 1.7.0 Created-By: 11.2-b01 (Sun Microsystems Inc.) It's the same content for both, working with JBOSS 4.2.2.GA as well as with JBOSS 5.1.0.GA With JBOSS 4.2.2.GA a can call the index.jsp and Java classes called within this JSP are found and the JSP is compiled, but with JBOSS 5.1.0.GA I get the above mentioned error messages org.apache.jasper.JasperException: Unable to compile class for JSP: ... cannot resolve to a type .. Is there a way to get rid of tihis problems. Something important seeemed to be changed from JBOSS 4.2.2.GA to JBOSS 5.1.0.GA Best wishes, Jim View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4236304#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...