build.xml

<?xml version="1.0"?>
<project name="default" basedir="." default="package">
  <property environment="env" />
  <property name="artifactId" value="backups" />
  <property name="version" value="3.4" />
  <property name="mainClass" value="com.imranzahid.backup.BackupMain" />
  <property name="jarfile" value="${artifactId}-${version}.jar" />
  <property name="targetdir" value="target" />

  <path id="runtime.classpath">
    <fileset dir="${targetdir}/libs" includes="*.jar" />
  </path>

  <pathconvert property="manifest.classpath" pathsep=" ">
    <path refid="runtime.classpath"/>
    <mapper>
      <chainedmapper>
        <flattenmapper/>
        <globmapper from="*.jar" to="libs/*.jar"/>
      </chainedmapper>
    </mapper>
  </pathconvert>

  <target name="clean">
    <delete file="${targetdir}/${jarfile}" failonerror="true" />
  </target>

  <target name="package" depends="clean">
    <jar destfile="${targetdir}/${jarfile}" basedir="${targetdir}/classes">
      <manifest>
        <attribute name="Built-By" value="${user.name}" />
        <attribute name="Main-Class" value="${mainClass}" />
        <attribute name="Class-Path" value="${manifest.classpath}" />
      </manifest>
    </jar>
  </target>

  <target name="test">
    <echo message="${manifest.classpath}" />
  </target>
</project>