examples/ant/applications2.xml

<!-- This Ant build file illustrates how to process applications,
     by including ProGuard-style configuration options.
     Usage: ant -f applications.xml -->

<project name="Applications" default="obfuscate" basedir="../..">

<target name="obfuscate">
  <taskdef resource="proguard/ant/task.properties"
           classpath="lib/proguard.jar" />

  <proguard>

    <!-- Specify the input jars, output jars, and library jars. -->

    -injars  in.jar
    -outjars out.jar

    -libraryjars ${java.home}/lib/rt.jar
    <!-- -libraryjars junit.jar    -->
    <!-- -libraryjars servlet.jar  -->
    <!-- -libraryjars jai_core.jar -->
    <!-- ...                       -->

    <!-- Preserve all public applications. -->

    -keepclasseswithmembers public class * {
        public static void main(java.lang.String[]);
    }

    <!-- Preserve all annotations. -->

    -keepattributes *Annotation*

    <!-- Preserve all native method names and the names of their classes. -->

    -keepclasseswithmembernames class * {
        native &lt;methods&gt;;
    }

    <!-- Preserve the methods that are required in all enumeration classes. -->

    -keepclassmembers class * extends java.lang.Enum {
        public static **[] values();
        public static ** valueOf(java.lang.String);
    }

    <!-- Explicitly preserve all serialization members. The Serializable
         interface is only a marker interface, so it wouldn't save them.
         You can comment this out if your library doesn't use serialization.
         If your code contains serializable classes that have to be backward
         compatible, please refer to the manual. -->

    -keepclassmembers class * implements java.io.Serializable {
        static final long serialVersionUID;
        static final java.io.ObjectStreamField[] serialPersistentFields;
        private void writeObject(java.io.ObjectOutputStream);
        private void readObject(java.io.ObjectInputStream);
        java.lang.Object writeReplace();
        java.lang.Object readResolve();
    }

    <!-- Your application may contain more items that need to be preserved;
         typically classes that are dynamically created using Class.forName -->

  </proguard>
</target>

</project>