proguard ant task

proguard (http://proguard.sourceforge.net/) promises for  the following:

• Creating more compact code, for smaller code archives, faster transfer across networks, faster loading, and smaller memory footprints.
• Making programs and libraries harder to reverse-engineer.
• Listing dead code, so it can be removed from the source code.
• Retargeting and preverifying existing class files for Java 6, to take full advantage of Java 6's faster class loading.

about proguard ant task: http://proguard.sourceforge.net/index.html#/manual/ant.html

here is code sample:

<target name="proguard" depends="jar">

<taskdef resource="proguard/ant/task.properties" classpath="${lib}/proguard-4.4.jar" />

<proguard configuration="${config}/obfuscate.pro">

<injar file="${build.dir}/prod.jar" />

<outjar file="${build.dir}/prod_obf.jar" />

<libraryjar refid="externals" />

</proguard>

</target>