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我已经构建了一个相当大的 java 应用程序，我想将它作为桌面应用程序运行。它还有其他几个需要工作的目录，以及包含类的 bin 文件夹，如图像文件夹、第 3 方 api、如数据库 jar 等。我有一个 build.xml 来创建 jar，但是jar 不运行。找不到其中一个 api 似乎是一个错误。

这是错误：

Exception in thread "main" java.lang.NoClassDefFoundError: bibliothek/gui/dock/c
ommon/CContentArea
        at pos.main.POSsystem.<init>(Unknown Source)
        at pos.main.POSsystem.main(Unknown Source)
Caused by: java.lang.ClassNotFoundException: bibliothek.gui.dock.common.CContent
Area
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 2 more

如果您对 build.xml 文件感到好奇，这里是：

<?xml version="1.0"?>

<project name="POSsystem" default="main" basedir=".">
    <!-- Sets variables which can later be used. -->
    <!-- The value of a property is accessed via ${} -->
    <property name="src.dir" location="src" />
    <property name="build.dir" location="bin" />        <!--the default bin eclipse folder-->
    <property name="shipping.dir" location="shipping" />
    <property name="doc.dir" location="doc" />
    <property name="main-class" value="pos.main.POSsystem" />
    <property name="splash-screen" value="images/splash.png" />
    <property name = "jars.dir" value="libs" />

    <property environment="env"/>
    <property name="ECLIPSE_HOME" value="C:\eclipse"/>
    <property name="debuglevel" value="source,lines,vars"/>
    <property name="target" value="1.7"/>
    <property name="source" value="1.7"/>

    <path id= "jars.path">
        <fileset dir="${jars.dir}" includes="**/*.jar" />
    </path>


    <path id="pos.classpath">
        <pathelement location="bin"/>
        <pathelement location="${jars.dir}/docking-frames-common.jar"/>
        <pathelement location="${jars.dir}/docking-frames-core.jar"/>
        <pathelement location="${jars.dir}/hsqldb.jar"/>
    </path>

    <!--THIS IS THE ADDED CODE FOR THE CLASSPATH-->
    <pathconvert property="manifest.classpath" pathsep=" ">
      <path refid="pos.classpath"/>
      <mapper>
        <chainedmapper>
           <flattenmapper/>
           <globmapper from="*.jar" to="libs/*.jar"/>
        </chainedmapper>
      </mapper>
    </pathconvert>


    <!-- Deletes the existing build, doc and shipping directory-->
    <target name="clean">
        <echo>"Cleaning..."</echo>
        <delete dir="${build.dir}" />
        <delete dir="${shipping.dir}" />
        <delete dir="${doc.dir}" />
        <echo>"Done Cleaning..."</echo>
    </target>

    <!-- Creates the  build, doc and shipping directory-->
    <target name="makedir" depends="clean">
        <echo>"Making Directories..."</echo>
        <mkdir dir="${build.dir}" />
        <mkdir dir="${doc.dir}" />
        <mkdir dir="${shipping.dir}" />
    </target>


    <!-- Compiles the java code -->
        <target name="compile" depends="makedir"> <!--depends="doc"> CHANGE BACK WHEN YOU RE-IMPLEMENT DOC-->
            <echo>"Compiling..."</echo>
            <javac srcdir="${src.dir}" destdir="${build.dir}"  includeantruntime = "false" classpathref="jars.path" />
        </target>

    <!--Creates the deployable jar file  -->
    <target name="jar" depends="compile">
        <echo>"Making Jar..."</echo>
        <jar destfile="${shipping.dir}\POSsystem.jar" basedir="${build.dir}">
            <manifest>
                <attribute name="Built-By" value="${user.name}"/>
                <attribute name="Main-Class" value="${main-class}" />
                <attribute name="Class-Path" value="${manifest.classpath}" />
                <attribute name = "SplashScreen-Image" value="${splash-screen}" />
            </manifest>
        </jar>
    </target>

    <target name="main" depends="jar"><!--depends="run">  CHANGE BACK WHEN YOU RE-IMPLEMENT RUN-->
        <description>Main target</description>
        <echo>Main...</echo>

        <!--run it here for now instead of from the jar-->
        <java classname="pos.main.POSsystem" failonerror="true" fork="yes">
            <jvmarg line="-splash:images/splash.png"/>
            <classpath refid="pos.classpath"/>
        </java>

    </target>

</project>

如果我将 build.xml 作为 ant 构建运行，它会全部编译，并且通过构建也将运行应用程序，但 jar 不会。

如果我缺少任何有用的信息，请告诉我。我已经阅读了很多关于使用 java 创建桌面应用程序的教程，但似乎无法做到这一点。

更新/编辑通过 Jayan 下面的评论，我认为我的问题确实不包括正确的类路径。所以我更新了我的 build.xml 文件以包含一个路径转换属性并将属性类路径添加到 jar 目标。但是，我仍然得到与上面发布的完全相同的错误。

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