Compilar JSP antes de publicar no Servidor?

BUILD FAILED: L:\Unissul\dist\compile\build.xml:22: java.lang.ExceptionInInitializerError

<project name="Webapp Precompilation" default="all" basedir="."> 

	<property name="tomcat.home" value="C:/Arquivos de programas/Apache Software Foundation/Tomcat 5.0" />
	<property name="webapp.path" value="${tomcat.home}/webapps/unissul" />
	<property name="java.home" value="C:/Arquivos de programas/j2sdk1.4.2_06" />
	
	<target name="jspc"> 
    	<taskdef classname="org.apache.jasper.JspC" name="jasper2" > 
      		<classpath id="jspc.classpath"> 
	        	<pathelement location="${java.home}/lib/tools.jar" /> 
	        	<fileset dir="${tomcat.home}/server/lib"> 
	          		<include name="*.jar"/> 
	        	</fileset> 
	        	<fileset dir="${tomcat.home}/common/lib"> 
	          		<include name="*.jar"/> 
	        	</fileset> 
      		</classpath> 
    	</taskdef> 

    	<jasper2 validateXml="false" uriroot="${webapp.path}" 
			webXmlFragment="${webapp.path}/WEB-INF/generated_web.xml" 
        	outputDir="${webapp.path}/WEB-INF/classes" /> 
	</target> 

  	<target name="compile">
    	<mkdir dir="${webapp.path}/WEB-INF/classes" />
    	<mkdir dir="${webapp.path}/WEB-INF/lib" />

		<javac destdir="${webapp.path}/WEB-INF/classes" optimize="off" debug="on" 
			failonerror="false" srcdir="${webapp.path}/WEB-INF/classes" excludes="**/*.smap">
      		<classpath>
        		<pathelement location="${webapp.path}/WEB-INF/classes" />
        		<fileset dir="${webapp.path}/WEB-INF/lib">
          			<include name="*.jar" />
        		</fileset>
        		<pathelement location="${tomcat.home}/common/classes" />
        		<fileset dir="${tomcat.home}/common/lib">
          			<include name="*.jar" />
        		</fileset>
        		<pathelement location="${tomcat.home}/shared/classes" />
        		<fileset dir="${tomcat.home}/shared/lib">
          			<include name="*.jar" />
        		</fileset>
      		</classpath>
      		<include name="**" />
      		<exclude name="tags/**" />
    	</javac>
  </target>

  <target name="all" depends="jspc, compile" />
</project>

Mais uma coisinha - quando você faz isso, ele põe os servlets compilados em um determinado diretório.

Só que o Tomcat não sabe que eles estão lá (ele acha que tem de procurar lá no work\Catalina\localhost\suaaplicacao ) , e tenta recompilar o tal do JSP de qualquer maneira. (Convenhamos que é meio tosco mesmo)

Para que funcione mesmo, você precisa mexer no web.xml e pôr as referências aos servlets gerados. (dica: procure esse arquivo generated_web.xml que o Jasper gerou. Copie o que for necessário dentro do web.xml da sua aplicação.)

<?xml version="1.0" encoding="iso-8859-1" ?>

<!-- 
	Build File para geração dos pacotes de produção em projetos web. 
-->

<project name="radar" basedir="../.." default="jspc">

	<property name="root.dir" value="${basedir}/site" />
	<property name="dist.dir" value="${basedir}/dist" />
	<property name="war.arquivo" value="${dist.dir}/radar.war" />
	<property name="web.descritor" value="${root.dir}/WEB-INF/web.xml" />
	<property name="web.lib" value="${root.dir}/WEB-INF/lib" />
	<property name="deploy.dir" value="${basedir}/classes" />
	<property name="tomcat.home" value="C:/Arquivos de programas/Apache Software Foundation/Tomcat 5.0" />
	<property name="shared.classes" value="${tomcat.home}/webapps/radar/WEB-INF/classes" />

	<target name="criarWar" description="Cria o arquivo de distribuição da aplicação web em produção">
		<delete file="${war.arquivo}" />
		<copy todir="${root.dir}/WEB-INF/classes">
			<fileset dir="${root.dir}/reports" includes="*.class" />
		</copy>
		<war destfile="${war.arquivo}" webxml="${web.descritor}">
			<fileset dir="${root.dir}" excludes="**/*.jrxml, reports/*.class" />
		</war>
	</target>

	<target name="jspc">
		<taskdef classname="org.apache.jasper.JspC" name="jasper2" loaderref="jspc">
			<classpath id="jspc.classpath">
				<pathelement location="${java.home}/../lib/tools.jar" />
				<fileset dir="${tomcat.home}/server/lib">
					<include name="*.jar" />
				</fileset>
				<fileset dir="${tomcat.home}/common/lib">
					<include name="*.jar" />
				</fileset>
			</classpath>
		</taskdef>

		<jasper2 validatexml="false" uriroot="${root.dir}" webxmlfragment="${root.dir}/WEB-INF/generated_web.xml" outputdir="${root.dir}/WEB-INF/classes" />
	</target>

</project>

Buildfile: L:\Radar\dist\deploy\build.xml
jspc:
BUILD FAILED: L:\Radar\dist\deploy\build.xml:41: java.lang.ExceptionInInitializerError
Total time: 2 seconds