jmonkeyengine/sdk/jme3-obfuscate/src/com/jme3/gde/obfuscate/pro-guard-targets.xml

    <target name="-obfuscate" depends="-test-obfuscate-enabled,-create-library-property" if="is.obfuscate.enabled">
        <taskdef resource="proguard/ant/task.properties"
         classpath="${libs.pro-guard.classpath}" />
        <proguard>
            -libraryjars ${proguard.library.path}
            -injars      ${dist.dir}/lib(!META-INF/MANIFEST.MF)
            -injars      ${dist.jar}
            -outjars     ${dist.jar}.obfuscated.jar
            -keepclasseswithmembers public class * {
                public static void main(java.lang.String[]);
            }
            ${obfuscate.options}
        </proguard>
        <delete file="${dist.jar}"/>
        <move file="${dist.jar}.obfuscated.jar" tofile="${dist.jar}"/>
        <delete>
            <fileset dir="${dist.dir}/lib" includes="**/*.jar"/>
        </delete>
    </target>

    <target name="-test-obfuscate-enabled">
        <condition property="is.obfuscate.enabled">
            <istrue value="${obfuscate}"/>
        </condition>
    </target>

    <target name="-create-library-property" depends="-create-mac-library-property">
        <property name="proguard.library.path" value="${java.home}/lib/rt.jar"/>
    </target>

    <target name="-create-mac-library-property" depends="-test-mac" if="is.macos">
        <property name="proguard.library.path" value="/System/Library/Frameworks/JavaVM.framework/Classes/classes.jar"/>
    </target>

    <target name="-test-mac">
        <condition property="is.macos">
            <os family="mac"/>
        </condition>
    </target>