Need an ANT task to include a set of jar files in the final jar's /lib dir

Question

My project folder has a bunch of dependent jars in:

/lib/someapi-1.1.1/main.jar
/lib/someotherapi-2.2.2/api-2.2.2.jar
/lib/...

I build a JAR file and my application requires that the dependent jars get included in the final jar in the /lib folder within the jar, so the final jar should have a structure something like:

/org/me/myclasses.class
/lib/main.jar
/lib/api-2.2.2.jar

How do I get the /lib/*.jar files flattened an included in the /lib directory of my final jar file?

---

CLARIFICATION

I'm essentially just trying to get a set of resource files flattened and added to a given directory in my final jar.

Answer 1

In case you wanted do skip the copy step, you could do it this way. It uses <mappedresources> to flatten from the source lib directories to the classes/lib area.

<jar destfile="${dist}/MyOneBigJar.jar">
    <fileset dir="${classes}"/>
    <mappedresources>
      <fileset dir="lib">
          <include name="**/*.jar" />
      </fileset>
      <chainedmapper>
          <flattenmapper />
          <globmapper from="*" to="classes/lib/*" />
      </chainedmapper>
    </mappedresources>
</jar>

Answer 2

The easiest way I see is to copy allyour jars to a temporary folder using the copy task and its flatten attribute, and to include the jars of this temporary directory into the destination jar.

---

ADDED DETAIL added by asker

Here's what the final ANT target looks like (for future reference):

  <target name="dist">
    <mkdir dir="${classes}/lib"/>
    <copy flatten="true" todir="${classes}/lib" includeemptydirs="false">
        <fileset dir="lib">
            <include name="**/*.jar" />
        </fileset>
    </copy>
    <jar destfile="${dist}/MyOneBigJar.jar">
        <fileset dir="${classes}"/>
    </jar>
  </target>