Migration from Jetty to Tomcat 5.5 issue: precompiled jsp er

[kosulin]

We migrate from JBoss 3.2.3/jetty to JBoss 4.0.3SP1/Tomcat 5.5
Our ear deploys fine, but when i try to open main page in a browser, I am getting an Exception:
11:37:45,193 ERROR [error_jsp]] Servlet.service() for servlet com.wsc.taxgard.jsp.error_jsp threw exception
java.lang.NullPointerException
at org.apache.jasper.runtime.TagHandlerPool.get(TagHandlerPool.java:108)
at com.wsc.taxgard.jsp.error_jsp._jspx_meth_c_if_0(error_jsp.java:103)
at com.wsc.taxgard.jsp.error_jsp._jspService(error_jsp.java:73)

My main page redirects to error.jsp, and this is fine, but it looks like there is an issue with Tomcat loading/handling of JSTL 1.0 in use by our application.

Any ideas how to fix this?

Thanks.

[kosulin]

Tomcat 5.5 requires use of it's own Jasper JspC compiler for pre-compilation of JSP.
The use of default JspC task from ANT 1.6.5 caused the issue.

[jobbyjoseph]

Thanks, well said, I have been looking into this issue for a while.
This is part of my build file and this fixed my problem

<!-- JJ added this -->
 <path id="ant1.classpath">
 <fileset dir="${basedir}/build/lib">
 <include name="**/*.jar"/>
 <include name="**/*.zip"/>
 </fileset>
 <fileset dir="${basedir}/source/j2ee/lib">
 <include name="**/*.jar"/>
 <include name="**/*.zip"/>
 </fileset>
 <fileset dir="${basedir}/source/webserver/webapp/src/WEB-INF/lib">
 <include name="**/*.jar"/>
 <include name="**/*.zip"/>
 </fileset>
 <fileset dir="${basedir}/source/webserver/java/lib">
 <include name="**/*.jar"/>
 <include name="**/*.zip"/>
 </fileset>
 <fileset dir="${basedir}/source/common/java/lib">
 <include name="**/*.jar"/>
 <include name="**/*.zip"/>
 </fileset>
 <!-- JJ added this -->
 <fileset dir="${basedir}/source/common/dist">
 <include name="**/*.jar"/>
 </fileset>

 <!-- Now add the tomcat related jars -->
 <fileset dir="${basedir}/build/lib/tomcat/server/lib">
 <include name="**/*.jar"/>
 <include name="**/*.zip"/>
 </fileset>
 <fileset dir="${basedir}/build/lib/tomcat/commons/lib">
 <include name="**/*.jar"/>
 <include name="**/*.zip"/>
 </fileset>


 </path>

 <target name="jspcc">
 <taskdef name="jasper2" classpath="${basedir}/build/lib/tomcat/commons/lib/jasper-compiler.jar"
 classname="org.apache.jasper.JspC">
 <classpath refid="ant1.classpath"/>
 </taskdef>

 <jasper2
 validateXml="false"
 outputDir="${jsp.precompile.build.src}"
 compiler="jasper55"
 package="${jsp.precompile.servlet.package}"
 uriroot="${jsp.precompile.jsp.src}"
 webXmlFragment="${jsp.precompile.jsp.webxml}"
 >
 </jasper2>

 </target>