Q:

websphere 7 (and Spring Roo) incompatible with javax.el.ELException

I have a application where the frontend is based on the Spring Roo 1.1.2 jspx files.
Every think works fine in Tomcat 6, but if I deploy the same application in a Websphere 7 (class loader: parent last), then I get a exception:
java.lang.ClassCastException: java.lang.NullPointerException incompatible with javax.el.ELException
[13.04.11 09:53:55:493 UTC] 00000026 servlet       E com.ibm.ws.webcontainer.servlet.ServletWrapper service SRVE0068E: Uncaught exception created in one of the service methods of the servlet /WEB-INF/layouts/default.jspx in application cyber. Exception created : com.ibm.websphere.servlet.error.ServletErrorReport: java.lang.ClassCastException: java.lang.NullPointerException incompatible with javax.el.ELException
    at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:693)
    at com.ibm._jsp._default_5F_jspx._jspService(_default_5F_jspx.java:123)
    at com.ibm.ws.jsp.runtime.HttpJspBase.service(HttpJspBase.java:98)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1655)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1595)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:104)
    at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:77)
    at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:895)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:932)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:500)
    at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
    at com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:121)
    at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.handleRequest(AbstractJSPExtensionServletWrapper.java:239)
    at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:341)
    at org.apache.tiles.servlet.context.ServletTilesRequestContext.forward(ServletTilesRequestContext.java:241)
    ...
Caused by: java.lang.ClassCastException: java.lang.NullPointerException incompatible with javax.el.ELException
    at org.apache.el.lang.ExpressionBuilder.prepare(ExpressionBuilder.java:139)
    at org.apache.el.lang.ExpressionBuilder.build(ExpressionBuilder.java:151)
    at org.apache.el.lang.ExpressionBuilder.createValueExpression(ExpressionBuilder.java:194)
    at org.apache.el.ExpressionFactoryImpl.createValueExpression(ExpressionFactoryImpl.java:67)
    at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:773)
    at com.ibm.ws.jsp.tagfile.webinf.util._load_2D_scripts.doTag(_load_2D_scripts.java:74)
    at com.ibm._jsp._default_5F_jspx._jspx_meth_util_load$1scripts_0(_default_5F_jspx.java:140)
    at com.ibm._jsp._default_5F_jspx._jspService(_default_5F_jspx.java:94)
    ... 88 more

The application has a Flex/BlazeDS part, that works fine. But there is also this JSP(x) part. The Spring controllers work, but there is something wrong with the JSPXs, and  I have no idea where to start, when I understand the specification right, than WAS7 provides JSP 2.1, that is exactly what I need.
The relevant part of the POM for the WAR is:
<dependency>
   <groupId>javax.servlet</groupId>
   <artifactId>com.springsource.javax.servlet.jsp.jstl</artifactId>         
   <version>1.2.0</version>         
 </dependency>
 <dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
    <scope>provided</scope>
 </dependency>
 <dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.1</version>
    <scope>provided</scope>     
  </dependency>

Can anybody give me a hint?
This this the maven dependency tree:
[INFO] +- cyber:cyber-core:jar:4.0.0.0-D1-SNAPSHOT:compile
[INFO] |  +- javax.validation:com.springsource.javax.validation:jar:1.0.0.GA:compile
[INFO] |  +- javax.transaction:com.springsource.javax.transaction:jar:1.1.0:compile
[INFO] |  +- org.apache.poi:poi:jar:3.6:compile
[INFO] |  +- net.sf.jxls:jxls-core:jar:0.9.9:compile
[INFO] |  |  +- commons-beanutils:commons-beanutils:jar:1.8.2:compile
[INFO] |  |  \- commons-jexl:commons-jexl:jar:1.1:compile
[INFO] |  |     \- junit:junit:jar:3.8.1:compile
[INFO] |  +- net.sf.jxls:jxls-reader:jar:0.9.9:compile
[INFO] |  +-    org.apache.commons:com.springsource.org.apache.commons.dbcp:jar:1.2.2.osgi:compile
[INFO] |  |  \- org.apache.commons:com.springsource.org.apache.commons.pool:jar:1.3.0:compile
[INFO] |  +- commons-io:commons-io:jar:1.4:compile
[INFO] |  +- org.apache.commons:com.springsource.org.apache.commons.collections:jar:3.2.1:compile
[INFO] |  +- commons-lang:commons-lang:jar:2.4:compile
[INFO] |  +- commons-math:commons-math:jar:1.2:compile
[INFO] |  +- jdom:jdom:jar:1.0:compile
[INFO] +- org.springframework:org.springframework.core:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:org.springframework.beans:jar:3.0.5.RELEASE:compile
[INFO] |  \- org.springframework:org.springframework.asm:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:org.springframework.context:jar:3.0.5.RELEASE:compile
[INFO] |  \- org.springframework:org.springframework.expression:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:org.springframework.web:jar:3.0.5.RELEASE:compile
[INFO] |  \- org.aopalliance:com.springsource.org.aopalliance:jar:1.0.0:compile
[INFO] +- org.springframework:org.springframework.web.servlet:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:org.springframework.aop:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:org.springframework.aspects:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:org.springframework.orm:jar:3.0.5.RELEASE:compile
[INFO] |  +- org.springframework:org.springframework.jdbc:jar:3.0.5.RELEASE:compile
[INFO] |  \- org.springframework:org.springframework.transaction:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:org.springframework.context.support:jar:3.0.5.RELEASE:compile
[INFO] +- org.springframework:spring-webmvc:jar:3.0.5.RELEASE:compile
[INFO] |  +- org.springframework:spring-asm:jar:3.0.5.RELEASE:compile
[INFO] |  +- org.springframework:spring-beans:jar:3.0.5.RELEASE:compile
[INFO] |  +- org.springframework:spring-context:jar:3.0.5.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-aop:jar:3.0.5.RELEASE:compile
[INFO] |  +- org.springframework:spring-context-support:jar:3.0.5.RELEASE:compile
[INFO] |  +- org.springframework:spring-core:jar:3.0.5.RELEASE:compile
[INFO] |  +- org.springframework:spring-expression:jar:3.0.5.RELEASE:compile
[INFO] |  \- org.springframework:spring-web:jar:3.0.5.RELEASE:compile
[INFO] |     \- aopalliance:aopalliance:jar:1.0:compile
[INFO] +- org.springframework.webflow:spring-js-resources:jar:2.2.1.RELEASE:compile
[INFO] +- org.springframework.security:org.springframework.security.core:jar:3.0.3.RELEASE:compile
[INFO] |  \- org.apache.commons:com.springsource.org.apache.commons.logging:jar:1.1.1:compile
[INFO] +- org.springframework.security:org.springframework.security.web:jar:3.0.3.RELEASE:compile
[INFO] +- org.springframework.security:org.springframework.security.config:jar:3.0.3.RELEASE:compile
[INFO] +- org.apache.tiles:tiles-core:jar:2.2.1:compile
[INFO] |  +- org.apache.tiles:tiles-api:jar:2.2.1:compile
[INFO] |  +- commons-digester:commons-digester:jar:2.0:compile
[INFO] |  \- org.slf4j:jcl-over-slf4j:jar:1.5.10:compile
[INFO] +- org.apache.tiles:tiles-jsp:jar:2.2.1:compile
[INFO] |  +- org.apache.tiles:tiles-servlet:jar:2.2.1:compile
[INFO] |  \- org.apache.tiles:tiles-template:jar:2.2.1:compile
[INFO] +- org.tuckey:urlrewritefilter:jar:3.1.0:compile
[INFO] +- org.springframework:spring-oxm:jar:3.0.5.RELEASE:compile
[INFO] +- javax.servlet:com.springsource.javax.servlet.jsp.jstl:jar:1.2.0:compile
[INFO] |  \- org.apache.taglibs:com.springsource.org.apache.taglibs.standard:jar:1.1.2:compile
[INFO] +- javax.servlet:servlet-api:jar:2.5:provided
[INFO] +- javax.servlet.jsp:jsp-api:jar:2.1:provided
[INFO] +- org.aspectj:aspectjweaver:jar:1.6.9:compile
[INFO] +- org.aspectj:aspectjrt:jar:1.6.9:compile

A:

The 4 steps to make a Roo generated JSPX running on Websphere 7
or how I spend my last two days

The problem is that the Roo (1.1.2) generated JSPX files are not compatible with IBM Webshpere. So it is not a problem of the libaries.
To get the Roo templates running you need to do this:

The first problem (that causes the java.lang.ClassCastException: java.lang.NullPointerException incompatible with javax.el.ELException Exception is this line <util:load-scripts /> in WEB-INF/layout/default.jspx  I have absolute no idea why, because all other tagx work (I spend my whole evening). The easiest work arround is to "include" the relevant content of /WEB-INF/tags/util/load-scripts.tagx direct by hand in default.jspx. (Then you can delete the load-scripts.tagx)
A new Validation error will occure: this is because IBM seams to have problems to parse jstl functions in '. For example: ${fn:toLowerCase(userLocale)}. And this is exacly one of the lines copied from load-scripts.tagx to default.jspx in step 1. My workarround is: to replace: 
<script type="text/javascript">var djConfig = {parseOnLoad: false, isDebug: false, locale: '${fn:toLowerCase(userLocale)}'};</script>

by: 
   <c:set var="userLocalLowerCase" value="${fn:toLowerCase(userLocale)}" /> 
   <script type="text/javascript">var djConfig = {parseOnLoad: false, isDebug: false, locale: '${userLocalLowerCase}'};</script>

Now you will see something, but I you look at the output, you will see, hat IBM Websphere 7 does not remove the namespace definitions form divs. But in the template you will have a lot of this <div xmlns:c="http://java.sun.com/jsp/jstl/core" xmlns:fn="http://java.sun.com/jsp/jstl/functions" xmlns:jsp="http://java.sun.com/JSP/Page" xmlns:spring="http://www.springframework.org/tags" version="2.0"> So what you need to do is extract all of them in to <jsp:root elements (In all jspx files). So that the files looks like that: 
<jsp:root xmlns:c="http://java.sun.com/jsp/jstl/core" ... version="2.0">
<div>
    ...
</div>
</jsp:root>

I am not 100% sure if this step is need, but you need the next one.
Now everything works, except the Java Scripts. That is because IBM Websphere 7, Normalize the JSPX output. So that lines like that:
<script src="${spring_dojo_url}" type="text/javascript"><!-- required for FF3 and Opera --></script>

become <script src="${spring_dojo_url}" type="text/javascript" /> unfortunately IE and Firefox (3) ignore this script tags.  The workaround is to put a <jsp:text> </jsp:text> in to the script part of all (3) relevant script tags, copied in step 1.
<script src="${dojo_url}" type="text/javascript"><!-- required for FF3 and Opera --><jsp:text> </jsp:text></script>
<script src="${spring_url}" type="text/javascript"><!-- /required for FF3 and Opera --><jsp:text> </jsp:text></script>
<script src="${spring_dojo_url}" type="text/javascript"><!-- required for FF3 and Opera --><jsp:text> </jsp:text></script>

At least your default.jspx look like this:
<jsp:root 
        xmlns:jsp="http://java.sun.com/JSP/Page"
        xmlns:fn="http://java.sun.com/jsp/jstl/functions"
        xmlns:c="http://java.sun.com/jsp/jstl/core"
        xmlns:tiles="http://tiles.apache.org/tags-tiles"
        xmlns:spring="http://www.springframework.org/tags"
        xmlns:util="urn:jsptagdir:/WEB-INF/tags/util"
        version="2.0">
<html>  

    <jsp:output doctype-root-element="HTML" doctype-system="-//W3C//DTD HTML 4.01//EN" doctype-public="http://www.w3.org/TR/html4/strict.dtd"/>

    <jsp:directive.page contentType="text/html;charset=UTF-8" />  
    <jsp:directive.page pageEncoding="UTF-8" /> 

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=8" />

        <spring:url value="/resources/styles/standard.css" var="roo_css_url" />
        <spring:url value="/resources/dojo/dojo.js" var="dojo_url" />
        <spring:url value="/resources/dijit/themes/tundra/tundra.css" var="tundra_url" />
        <spring:url value="/resources/spring/Spring.js" var="spring_url" />
        <spring:url value="/resources/spring/Spring-Dojo.js" var="spring_dojo_url" />
        <spring:url value="/resources/images/favicon.ico" var="favicon" />
        <link rel="stylesheet" type="text/css" media="screen" href="${roo_css_url}"><!-- required for FF3 and Opera --></link>
        <link rel="stylesheet" type="text/css" href="${tundra_url}"><!-- required for FF3 and Opera --></link>
        <link rel="SHORTCUT ICON" href="${favicon}" />

        <!-- Get the user local from the page context (it was set by Spring MVC's locale resolver) -->
        <c:set var="userLocale">
          <c:out value="${pageContext.response.locale}" default="en" />
        </c:set>

        <c:set var="userLocalLowerCase" value="${fn:toLowerCase(userLocale)}" /> 
        <script type="text/javascript">var djConfig = {parseOnLoad: false, isDebug: false, locale: '${userLocalLowerCase}'};</script>
        <script src="${dojo_url}" type="text/javascript"><!-- required for FF3 and Opera --><jsp:text> </jsp:text></script>
        <script src="${spring_url}" type="text/javascript"><!-- /required for FF3 and Opera --><jsp:text> </jsp:text></script>
        <script src="${spring_dojo_url}" type="text/javascript"><!-- required for FF3 and Opera --><jsp:text> </jsp:text></script>
        <script language="JavaScript" type="text/javascript">dojo.require("dojo.parser");</script>        

        <spring:message code="application_name" var="app_name"/>
        <title><spring:message code="welcome_h3" arguments="${app_name}" /></title>
    </head>

    <body class="tundra spring">
        <div id="wrapper">
            <tiles:insertAttribute name="header" ignore="true" />
            <tiles:insertAttribute name="menu" ignore="true" />   
            <div id="main">
                <tiles:insertAttribute name="body"/> 
                <tiles:insertAttribute name="footer" ignore="true"/>
            </div>
        </div>
    </body>
</html>
</jsp:root>

