@Override
      public void stackFrameChanged() {
        XStackFrame frame = session.getCurrentStackFrame();
        if (frame instanceof JavaStackFrame) {
          showAlternativeNotification(frame);
          StackFrameProxyImpl frameProxy = ((JavaStackFrame)frame).getStackFrameProxy();
          DebuggerContextUtil.setStackFrame(javaSession.getContextManager(), frameProxy);
          saveNodeHistory(frameProxy);
        }
      }
@Override
      public void stackFrameChanged()