我的项目使用ant build脚本创建WEB_INF / lib文件夹并将所有jar文件复制到其中，当我运行build.xml时，创建的war文件包含所有jar的WEB_INF / lib文件夹，我有以下错误在运行时：
servlet action threw exception: java.lang.ClassNotFoundException: org.dom4j.DocumentException
但是，如果我手动创建WEB_INF / lib文件夹并将dom4j.jar放入其中，并运行相同的build.xml，则一切正常，并且没有此类错误。
我的build.xml文件是：
<project name="hrperf" default="compile">
<property environment="env"/>
<!-- HUDSON properties -->
<property name="project.build.no" value="${env.BUILD_NUMBER}"/>
<!-- project properties -->
<property name="project.name" value="${ant.project.name}"/>
<property name="project.version" value="6.3.7"/>
<!-- build file debug properties [on|off] -->
<property name="build.debug" location="on"/>
<!-- path properties -->
<property name="src.dir" location="src"/>
<property name="src.resources.dir" location="${src.dir}/com/bchydro/hrperf/resources"/>
<property name="lib.dir" location="lib"/>
<property name="build.dir" location="build"/>
<property name="build.classes.dir" location="${build.dir}/classes"/>
<property name="dist.dir" location="dist"/>
<property name="bin.dir" location="bin"/>
<property name="dist.wartemp.dir" location="${dist.dir}/wartemp"/>
<property name="dist.wartemp.web-inf.dir" location="${dist.wartemp.dir}/WEB-INF"/>
<property name="dist.wartemp.web-inf.classes.dir" location="${dist.wartemp.web-inf.dir}/classes"/>
<property name="dist.wartemp.web-inf.lib.dir" location="${dist.wartemp.web-inf.dir}/lib"/>
<property name="dist.wartemp.resources.dir" location="${dist.wartemp.web-inf.classes.dir}/com/bchydro/hrperf/resources"/>
<property name="defaultroot.dir" location="defaultroot"/>
<property name="db.server.token" value="<set-property property="url" value="jdbc:oracle:thin:@EDMEXORCT1:1521:EXWEBTST" />"/>
<property name="db.username.token" value="<set-property property="username" value="compauth_dev" />"/>
<property name="db.password.token" value="<set-property property="password" value="compauth_dev1" />"/>
<!-- Test classpath properties -->
<property name="test.dir" location="${build.dir}/test"/>
<property name="test.data.dir" location="${test.dir}/data"/>
<property name="test.reports.dir" location="${test.dir}/reports"/>
<property name="javadocs.dir" value="${test.reports.dir}/javadocs"/>
<property name="lib.junit.dir" location="${lib.dir}/junit-3.8.1"/>
<property name="junit.jar" value="${lib.junit.dir}/junit.jar"/>
<!-- application properties -->
<property name="warfile.name" value="${project.name}-${project.version}.${project.build.no}"/>
<!-- <property name="warfile.region" value="-DEV"/>-->
<property name="warfile.ext" value=".war"/>
<property name="hrperf.properties.name" value="hrperf.properties"/>
<property name="hrperf.messages.name" value="messages.properties"/>
<property name="log4j.properties.name" value="log4j.properties"/>
<property name="struts-config.xml.name" value="struts-config.xml"/>
<property name="struts-db.xml.name" value="struts-db.xml"/>
<property name="crconfig.xml.name" value="CRConfig.xml"/>
<property name="package.name" value="hrperf" />
<!-- lib path properties -->
<property name="servlet.jar" value="${lib.servlet.dir}/servlet.jar"/>
<property name="lib.dbcp.dir" location="${lib.dir}/commons-dbcp-1.4"/>
<property name="lib.pool.dir" location="${lib.dir}/commons-pool-1.6"/>
<property name="lib.log4j.dir" location="${lib.dir}/jakarta-log4j-1.2.8"/>
<property name="lib.struts.dir" location="${lib.dir}/jakarta-struts-1.2.6"/>
<property name="lib.jdbc.dir" location="${lib.dir}/jdbc"/>
<property name="lib.jstl.dir" location="${lib.dir}/jstl"/>
<property name="lib.mail.dir" location="${lib.dir}/mail"/>
<property name="lib.servlet.dir" location="${lib.dir}/servlet"/>
<property name="lib.displaytag.dir" location="${lib.dir}/displaytag-1.0"/>
<property name="lib.jfreecharttag.dir" location="${lib.dir}/jfreechart"/>
<property name="lib.cewolf.dir" location="${lib.dir}/cewolf"/>
<property name="lib.crystal.dir" location="${lib.dir}/crystal"/>
<property name="lib.cloning.dir" location="${lib.dir}/cloning-1.9.0"/>
<property name="lib.cobertura.dir" location="${lib.dir}/cobertura-1.8"/>
<property name="lib.poi.dir" location="${lib.dir}/poi-3.9"/>
<property name="lib.commons-fileupload.dir" location="${lib.dir}/commons-fileupload"/>
<property name="lib.commons-io.dir" location="${lib.dir}/commons-io"/>
<property name="lib.commons-collections.dir" location="${lib.dir}/commons-collections"/>
<property name="lib.dom4j.dir" location="${lib.dir}/dom4j-1.6.1"/>
<property name="lib.gson.dir" location="${lib.dir}/gson"/>
<!-- classpath properties -->
<property name="log4j.jar" value="${lib.log4j.dir}/log4j-1.2.8.jar"/>
<property name="struts.jar" value="${lib.struts.dir}/struts.jar"/>
<property name="jstl.jar" value="${lib.jstl.dir}/jstl.jar"/>
<property name="standard.jar" value="${lib.jstl.dir}/standard.jar"/>
<property name="mail.jar" value="${lib.mail.dir}/mail.jar"/>
<property name="displaytag.jar" value="${lib.displaytag.dir}/displaytag-1.0.jar"/>
<property name="jfreecharttag.jar" value="${lib.jfreecharttag.dir}/jfreechart-1.0.0-rc1.jar"/>
<property name="jcommon.jar" value="${lib.jfreecharttag.dir}/jcommon-1.0.0-rc1.jar"/>
<property name="cewolf.jar" value="${lib.cewolf.dir}/cewolf.jar"/>
<property name="dom4j.jar" value="${lib.dom4j.dir}/dom4j-1.6.1.jar"/>
<property name="gson-2.2.4-sources.jar" value="${lib.gson.dir}/gson-2.2.4-sources.jar"/>
<property name="gson-2.2.4.jar" value="${lib.gson.dir}/gson-2.2.4.jar"/>
<!-- Classpath properties -->
<property name="cobertura.jar" value="${lib.cobertura.dir}/cobertura-1.8.jar"/>
<!-- cobertura serialized filename -->
<property name="cobertura.ser.name" value="${test.data.dir}/cobertura.ser"/>
<!-- Crystal Reports Libraries -->
<property name="cloning.jar" value="${lib.cloning.dir}/*.jar"/>
<property name="crystal.jar" value="${lib.crystal.dir}/*.jar"/>
<!--
=======================================================================
Classpaths
=======================================================================
-->
<!-- compile classpath -->
<path id="compile.classpath">
<pathelement location="${log4j.jar}"/>
<pathelement location="${struts.jar}"/>
<pathelement location="${jstl.jar}"/>
<pathelement location="${standard.jar}"/>
<pathelement location="${servlet.jar}"/>
<pathelement location="${mail.jar}"/>
<pathelement location="${displaytag.jar}"/>
<pathelement location="${jfreecharttag.jar}"/>
<pathelement location="${jcommon.jar}"/>
<pathelement location="${cewolf.jar}"/>
<pathelement location="${dom4j.jar}"/>
<pathelement location="${gson-2.2.4-sources.jar}"/>
<pathelement location="${gson-2.2.4.jar}"/>
<!-- Crystal Reports jar files -->
<pathelement location="${crystal.jar}"/>
<fileset dir="lib">
<include name="**/*.jar"/>
</fileset>
</path>
<!-- Test classpath -->
<path id="test.classpath">
<path refid="compile.classpath" />
<pathelement location="${junit.jar}"/>
<pathelement location="${build.dir}/classes"/>
<pathelement location="${build.dir}/test"/>
</path>
<!-- Cobertura classpath -->
<path id="cobertura.classpath">
<path refid="test.classpath"/>
<fileset dir="${lib.log4j.dir}" includes="**/*.jar"/>
<fileset dir="${lib.cobertura.dir}" includes="**/*.jar"/>
</path>
创建war文件的任务如下：
<!-- STAGING -->
<target name="staging" depends="packageinit">
<!-- Load Application Properties File -->
<property file="${src.resources.dir}/hrperf.staging.properties" />
<!-- copy struts DB file -->
<copy file="${dist.wartemp.web-inf.dir}/struts-db-staging.xml" tofile="${dist.wartemp.web-inf.dir}/${struts-db.xml.name}" overwrite="true"/>
<!-- remove development, staging, esc and production struts-db files -->
<delete>
<fileset dir="${dist.wartemp.web-inf.dir}" includes="*-development.xml, *-staging.xml, *-esc.xml, *-production.xml"/>
</delete>
<!-- copy resource files -->
<copy file="${src.resources.dir}/hrperf.staging.properties" tofile="${dist.wartemp.resources.dir}/${hrperf.properties.name}"/>
<copy file="${lib.log4j.dir}/log4j.staging.properties" tofile="${dist.wartemp.web-inf.classes.dir}/${log4j.properties.name}" overwrite="true"/>
<property name="warfile.region" value="-test"/>
<antcall target="warfinal"/>
</target>