我在Eclipse中编译并运行程序，并且一切正常，但是当我将其与Ant打包并运行时，出现以下错误：

Exception in thread "main" java.lang.NoClassDefFoundError: org/supercsv/io/ICsvB
eanReader
Caused by: java.lang.ClassNotFoundException: org.supercsv.io.ICsvBeanReader
        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)
Could not find the main class: jab.jm.main.Test. Program will exit.

请注意，这是 运行时 错误，而不是Ant 的 编译器错误 。

我以前用0个问题构建了这个项目，现在 当我在lib文件夹中添加第二个软件包时，它突然对我起作用了 ？

这是供参考的构建文件：

<?xml version="1.0" ?>

<project name="ServerJar" default="dist" basedir=".">
 <description>
  Builds client files into .jar
 </description>
 <!-- [build variables] -->
 <property name="src" location="src" />
 <property name="build" location="build" />
 <property name="dist" location="dist" />
 <property name="lib" location="lib" />
 <!-- [path to packages] -->
 <path id="master-classpath">
     <fileset dir="${lib}">
         <include name="*.jar"/>
     </fileset>
 </path>


 <target name="init">
  <!-- makes time stamp to be used in jar name -->
  <tstamp />
  <!-- creates build directory structure -->
  <mkdir dir="${build}" />
 </target>

 <target name="compile" depends="init" description="Compiles the source">
  <!-- compiles the java code from ${src} into ${build} -->
  <!-- <javac srcdir="${src}" destdir="${build}" /> -->
  <javac destdir= "${build}">
      <src path="${src}"/>
      <classpath refid="master-classpath"/>
  </javac>
 </target>

 <target name="dist" depends="compile" description="Generates distributable">
  <!-- creates the distribution directory -->
  <mkdir dir="${dist}/lib" />

  <!-- puts everything in ${build} into the jar file -->
  <jar jarfile="${dist}/lib/CC-${DSTAMP}.jar" basedir="${build}">
   <manifest>
    <attribute name="Main-Class" value="jab.jm.main.Test" />
   </manifest>
  </jar>

  <!-- makes a jar file for quick test execution -->
  <jar jarfile="${dist}/lib/CC.jar" basedir="${build}">
   <manifest>
    <attribute name="Main-Class" value="jab.jm.main.Test" />
   </manifest>
  </jar>
 </target>

 <target name="clean" description="Cleans up the extra build files">
  <!-- deletes the ${build} and ${dist} directories -->
  <delete dir="${build}" />
  <delete dir="${dist}" />
 </target>
</project>

在此先感谢您的帮助！

编辑：

这是我的主类构造的样子（这不是实际的文件，但这是我所基于的）。对于Java程序，其构造非常奇怪，并且可能给Ant一些问题。关于如何重建这一点的任何建议？尝试将其分为多个部分时出现了很多错误。我以前从未见过这样的构造（是的，我知道它是如何工作的（并且在编译时会起作用），但是Ant可能不喜欢它）。

import java.io.FileReader;
import java.io.IOException;

import org.supercsv.cellprocessor.Optional;
import org.supercsv.cellprocessor.ParseDate;
import org.supercsv.cellprocessor.ParseInt;
import org.supercsv.cellprocessor.constraint.StrMinMax;
import org.supercsv.cellprocessor.constraint.Unique;
import org.supercsv.cellprocessor.ift.CellProcessor;
import org.supercsv.io.CsvBeanReader;
import org.supercsv.io.ICsvBeanReader;
import org.supercsv.prefs.CsvPreference;

class ReadingObjects {
    static final CellProcessor[] userProcessors = new CellProcessor[] {
        new Unique(new StrMinMax(5, 20)),
        new StrMinMax(8, 35),
        new ParseDate("dd/MM/yyyy"),
        new Optional(new ParseInt()),
        null
    };

    public static void main(String[] args) throws Exception {
        ICsvBeanReader inFile = new CsvBeanReader(new FileReader("foo.csv"), CsvPreference.EXCEL_PREFERENCE);
        try {
          final String[] header = inFile.getCSVHeader(true);
          UserBean user;
          while( (user = inFile.read(UserBean.class, header, userProcessors)) != null) {
            System.out.println(user.getZip());
          }
        } finally {
          inFile.close();
        }
   }
}

public class UserBean {
    String username, password, town;
    Date date;
    int zip;

    public Date getDate() {
        return date;
    }
    public String getPassword() {
        return password;
    }
    public String getTown() {
        return town;
    }
    public String getUsername() {
        return username;
    }
    public int getZip() {
        return zip;
    }
    public void setDate(final Date date) {
        this.date = date;
    }
    public void setPassword(final String password) {
        this.password = password;
    }

    public void setTown(final String town) {
        this.town = town;
    }
    public void setUsername(final String username) {
        this.username = username;
    }
    public void setZip(final int zip) {
        this.zip = zip;
    }
}

请注意，该类的名称实际上是UserBean，它包含一个名为ReadingObjects的非公共类，其中包含主方法。