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When returning VO as json, how to return excluding null value?

When returning vo as JSON, how to go back except the null price?

@RequestMapping("/rbtInfo.do")

     public RobotVO rbtInfo(@RequestParam String rbtId){

         String rbtPower = "ON";

         robot.setRbtPower(rbtPower);

         return robot;

     }

Above is my controller.

And the return value is as follows.

{

     "rbtId": null,

     "rbtPower": "ON",

     "rtspAddr": null,

     "ifrRtspAddr": null,

     "stationPosition": null,

}

In this example, I want to go back simplest power for which the cost exists, but not the relaxation.