@Override
 public void merge(WorkQueuingDescriptor src, WorkQueuingDescriptor dst) {
   dst.klass = src.klass;
 }
 @Override
 public WorkQueuingDescriptor clone(WorkQueuingDescriptor orig) {
   WorkQueuingDescriptor other = new WorkQueuingDescriptor();
   other.klass = orig.klass;
   return other;
 }