message: java(test): enable debug mode to show useful stacktraces
diff: <target name="compile">
  <mkdir dir="build/classes"/>
  - <javac sourcepath="" srcdir="src" destdir="build/classes" includeantruntime="false" >
  + <javac sourcepath="" srcdir="src" destdir="build/classes" debug="on" includeantruntime="false" >
  <include name="**/*.java"/>
  <classpath refid="master-classpath"/>
  </javac>
  