I am sorry, I wrongly pasted the content of web.xml twice and therefore the stack trace was missing. So here's the stack trace I receive on JBoss AS 5.0.1.GA: 22:28:18,179 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception | org.apache.jasper.JasperException: Unable to compile class for JSP: | | An error occurred at line: 11 in the jsp file: /WEB-INF/includes/header.jspf | Vector cannot be resolved to a type | 8: <p> | 9: <%! boolean test=true; %> | 10: <% | 11: Vector v = new Vector(); | 12: v.add(new Integer(2)); | 13: %> | 14: Value: <%= v.get(0).toString() %> | | | An error occurred at line: 11 in the jsp file: /WEB-INF/includes/header.jspf | Vector cannot be resolved to a type | 8: <p> | 9: <%! boolean test=true; %> | 10: <% | 11: Vector v = new Vector(); | 12: v.add(new Integer(2)); | 13: %> | 14: Value: <%= v.get(0).toString() %> | | | Stacktrace: | at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92) | at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330) | at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439) | at org.apache.jasper.compiler.Compiler.compile(Compiler.java:335) | at org.apache.jasper.compiler.Compiler.compile(Compiler.java:313) | at org.apache.jasper.compiler.Compiler.compile(Compiler.java:300) | at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:585) | at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:312) | at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322) | at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:249) | at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92) | at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) | at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) | at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829) | at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601) | at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) | at java.lang.Thread.run(Thread.java:619) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4216233#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...