private void emitGetCallbacks(ClassEmitter ce) {
    CodeEmitter e = ce.begin_method(Constants.ACC_PUBLIC, GET_CALLBACKS, null);
    e.load_this();
    e.invoke_static_this(BIND_CALLBACKS);
    e.load_this();
    e.push(callbackTypes.length);
    e.newarray(CALLBACK);
    for (int i = 0; i < callbackTypes.length; i++) {
      e.dup();
      e.push(i);
      e.load_this();
      e.getfield(getCallbackField(i));
      e.aastore();
    }
    e.return_value();
    e.end_method();
  }
private void emitGetCallbacks(ClassEmitter ce)