Spring boot Controller json response has a field name "empty"

Question

I have a GET endpoint in my application supposed to return :

{
  "gameId": "41a483c4-6220-424a-a931-d9114a4f6748",
  "pits": [
    {
      "id": 1,
      "stones": 6
    },
    {
      "id": 2,
      "stones": 6
    },
    {
      "id": 3,
      "stones": 6
    },
    {
      "id": 4,
      "stones": 6
    },
    {
      "id": 5,
      "stones": 6
    },
    {
      "id": 6,
      "stones": 6
    },
    {
      "id": 7,
      "stones": 0
    },
    {
      "id": 8,
      "stones": 6
    },
    {
      "id": 9,
      "stones": 6
    },
    {
      "id": 10,
      "stones": 6
    },
    {
      "id": 11,
      "stones": 6
    },
    {
      "id": 12,
      "stones": 6
    },
    {
      "id": 13,
      "stones": 6
    },
    {
      "id": 14,
      "stones": 0
    }
  ],
  "playerTurn": null,
  "currentPitIndex": 0
}

but instead it returns:

{
    "id": "25f09303-b797-418f-a7e7-db0e5fa8631b",
    "pits": [
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 0,
            "empty": true
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 6,
            "empty": false
        },
        {
            "stones": 0,
            "empty": true
        }
    ],
    "playerTurn": null,
    "currentPitIndex": null
}

I am wondering what is "empty"?! and where is "id"!

would be much appreciated for any suggestion and help. thank you

Please provide the method in the Controller as well as the object it returns. Rob's answer should point you in the right direction though. — almac777
– almac777, Commented Mar 12, 2022 at 11:41

Rob Spoor · Accepted Answer · 2022-03-12 10:56:56Z

1

Does your class have a method called isEmpty()? Because most JSON marshalling frameworks add JSON properties for any method with 0 arguments that starts with get, or returns a boolean and starts with is. For the same reason id is probably missing - I'm guessing there is no getter for it. The top level gameId is probably called id because you have a getId() method, not a getGameId() method.

For most frameworks you can tweak this with annotations. For instance, with Jackon you can use @JsonIgnore to indicate a method should not be represented as a JSON property, and @JsonProperty can be used to a) add a custom name, or b) allow a field to be included as well. For other frameworks you should check their documentation.

answered Mar 12, 2022 at 10:56

Rob Spoor

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2 Comments

Omid Zare Over a year ago

Hi Rob Spoor, edit:( I made a spelling mistake in my question gameId is actually id). I am not using isEmpty method

Omid Zare Over a year ago

I found isEmpty() metod. checking that the stones value is 0 or not

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