Proguard Error with ant/antenna

Question

I get the following proguard error:
[wtkobfuscate] java.io.IOException: The output jar is empty. Did you specify the proper '-keep' optons?
Any idea what is wrong?
Thanks,
earamsey
[wtkobfuscate] Obfuscating C:\Projects\J2ME\CellStory\bin\CellStory.jar with ProGuard
[wtkobfuscate] ProGuard, version 3.2
[wtkobfuscate] Reading jars...
[wtkobfuscate] Reading program jar [C:\Projects\J2ME\CellStory\bin\CellStory.jar]
[wtkobfuscate] Reading library zip [C:\WTK22\wtklib\devices\Series_60_MIDP_SDK_2_1\lib\kmidp20.zip]
[wtkobfuscate] Removing unused library classes...
[wtkobfuscate] Original number of library classes: 305
[wtkobfuscate] Final number of library classes: 6
[wtkobfuscate] Shrinking...
[wtkobfuscate] Removing unused program classes and class elements...
[wtkobfuscate] Original number of program classes: 1
[wtkobfuscate] Final number of program classes: 0
[wtkobfuscate] java.io.IOException: The output jar is empty. Did you specify the proper '-keep' options?
^^^^^___Error that I get is here
[wtkobfuscate] at proguard.ProGuard.shrink(ProGuard.java:474)
[wtkobfuscate] at proguard.ProGuard.execute(ProGuard.java:86)
[wtkobfuscate] at proguard.ProGuard.main(ProGuard.java:916)
Here is my build.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<project name="MIDP2.0" default="n66xx" basedir=".">
    <description>
     Build file for MyLittleProject
    </description>
    <!-- predefined antenna tasks -->
    <taskdef resource="antenna.properties"/>
    <!-- ProGuard home -->
    <property name="wtk.proguard.home" value="C:\proguard3.2"/>
    <!-- RetroGuard home -->
    <property name="wtk.retroguard.home" value="C:\retroguard-v2.0.2"/>
    <property name="midlet.name" value="MyLittleProject"/>
    <property name="midlet.home" value="C:\Projects\J2ME\MyLittleProject"/>
    <target name="build" description="Builds everything">
     <antcall target="n66xx"/>
    </target>
    <target name="n66xx" description="Builds Nokia Models 6600 and 6620">
     <ant dir="devices/nokia66xx" inheritall="true" target="build"/>
    </target>
    <target name="cellstory_init" description="Create directory structure">
     <property name="src_pp" location="${preproc_dir}"/>
     <!-- set global properties -->
     <property name="src" location="src"/>
     <property name="bin" location="bin"/>
     <property name="res" location="res"/>
     <property name="classes" location="classes"/>
     <!-- Create the timestamp -->
     <tstamp/>
     <!-- Make directories -->
     <mkdir dir="${src}"/>
     <mkdir dir="${src_pp}"/>
     <mkdir dir="${bin}"/>
     <mkdir dir="${res}"/>
     <mkdir dir="${classes}"/>
    </target>
    <target name="cellstory" depends="cellstory_init" description="Build it all">
     <wtkjad
         jadfile="${bin}/${midlet.name}.jad"
         jarfile="${midlet.name}.jar"
         name="MyLittleProject"
         vendor="Wizzards and Lizzards"
         version="1.0.0">
         <midlet
          name="${midlet.name}"
          icon="${midlet.name}.png"
          class="${midlet.name}.class"/>
         <attribute
          name="deleteConfirm"
          value="Do you really want to delete me?"/>
     </wtkjad>
     <!-- do preprocessing -->
     <wtkpreprocess
         srcdir="${src}"
         destdir="${src_pp}"
         symbols="${symbols}"/>
     <!-- Compile the code -->
     <wtkbuild
         srcdir="${src_pp}"
         destdir="${classes}"
         deprecation="on"
         target="1.4"
         source="1.4"/>
     <!-- Package the classes -->
     <wtkpackage
         jarfile="${bin}/${midlet.name}.jar"
         jadfile="${bin}/${midlet.name}.jad"
         obfuscate="false"
         preverify="false">
         <fileset dir="${classes}" includes="**/*.class"/>
         <fileset dir="${res}" includes="**"/>
     </wtkpackage>
     <wtkobfuscate
         jarfile="${bin}/${midlet.name}.jar"
         jadfile="${bin}/${midlet.name}.jad"
         tojarfile="${bin}/${midlet.name}._jar"
         obfuscator="proguard">
     </wtkobfuscate>
     <wtkpreverify jarfile="${bin}/${midlet.name}.jar"/>
     <!-- run -->
     <wtkrun jadfile="${bin}/${midlet.name}.jad" device="Series_60_MIDP_SDK_2_1"/>
    </target>
    <target name="cleanbuild" description="Cleans and builds">
     <ant dir="devices/nokia66xx" inheritall="true" target="cleanbuild"/>
    </target>
</project>

Answer 1

I figured this out - I needed a formatter tag to see the output of the test.