Clean way to combine multiple jars? Preferably using Ant

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Vladimir’s answer is a correct one, but I feel that what he suggests implies repacking all jars in a one big out.jar, which is then feeded to Ant Jar task as a single <zipfileset> or something like that. This two-step approach is unnecessary. I’m not sure whether this is connected with Ant version, but I have Ant 1.7.1, and its <jar> task understands <zipgroupfileset>, which allows to feed all contents of third party jars’ directly. 

<jar destfile="MyApplication.jar">
  <zipgroupfileset dir="lib" includes="*.jar" /> 
  <!-- other options -->
  <manifest>
    <attribute name="Main-Class" value="Main.MainClass" />
  </manifest>
</jar>

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