Question

I have runnable jar with couple of 3rd party jars inside it. Do I have to specify those libraries with Proguard’s -libraryjar option even if they are already packed in the main jar file?

At the moment I’m these errors:

Warning: there were 171 unresolved references to classes or interfaces.
Warning: there were 394 instances of library classes depending on program classes.
Warning: there were 1 unresolved references to program class members.

If I specify the jars with -libraryjar option Proguard warns alot about duplicate classes.

My ant build:

<target name="jar" depends="compile">
    <delete file="${destfile}" />
    <jar destfile="${destfile}" filesetmanifest="mergewithoutmain" duplicate="preserve">
        <manifest>
            <attribute name="Main-Class" value="main.Main"/>
            <attribute name="Class-Path" value="${classpath}"/>
        </manifest>
    <fileset dir="${target}" includes="**/*.class" />
        <zipfileset excludes="META-INF/*.SF" src="lib1.jar" />
        <zipfileset excludes="META-INF/*.SF" src="lib2.jar" />
        <zipfileset excludes="META-INF/*.SF" src="lib3.jar" />
    </jar>
</target>

<target name="dist" depends="jar">
    <taskdef resource="proguard/ant/task.properties" classpath="${proguard}" />
    <proguard>
        -injars      ${destfile}
        -outjars     ${destfileobfuscated}
        -libraryjars C:/Java/jdk1.6.0_25/jre/lib/rt.jar;
                     C:/Java/jdk1.6.0_25/jre/lib/jsse.jar;
                     C:/Java/jdk1.6.0_25/jre/lib/jce.jar;
                     lib1.jar;
                     lib2.jar;
                     lib3.jar

        -optimizationpasses 5
        -overloadaggressively
        -repackageclasses ''
        -allowaccessmodification
        -dontskipnonpubliclibraryclassmembers

        -keepclasseswithmembers public class * {
            public static void main(java.lang.String[]);
        }
    </proguard>
    <move file="${destfileobfuscated}" tofile="${destfile}" />
</target>

Answer 1

In proguard you must assign your 3rd party library jars with the following command:

-libraryjars  jar1.jar, jar2.jar, jar3.jar...

If you don’t include these jars as above, the code related to them will not be obfuscated/optimized/shrinked because they will be unresolved with respect to proguard.

It’s OK if it warns, because it will find a lot of classes with the same name, it’s normal, but this wont have any negative impacts on the outcome.