build-jars-classpath-string.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<project default="display_classpath_string" name="Display classpath string of jar files">
  <!-- Require ANT version 1.7+ because of manifestclasspath -->

  <!-- Define location of jar files -->
  <path id="path.to.jars">
    <fileset dir="./lib/">
      <include name="**/*.jar"/>
      <exclude name="testng*.jar"/>
    </fileset>
  </path>

  <!-- This is the important line: by specifying in the "jarfile" attribute the location of the
       generated jar, ANT will be able to deduce the relative path to you jar libraries. -->
  <manifestclasspath property="lib.list" jarfile="./lib/">
    <classpath refid="path.to.jars" />
  </manifestclasspath>

  <target name="display_classpath_string">
    <echo message="${lib.list}"/>
  </target>

</project>