Jersey generic object

Question

I'm working with REST services using Jersey for my JSON handle. I'd like to make a method which consumes a generic object. Is there a way to deserialize it without a bean class?

JSON:

{
    "id": "2",
    "name": "John"  
}

Current method (using bean class):

@Path("/loginCheck")
    @POST
    @Consumes({ MediaType.APPLICATION_JSON })
    @Produces({ MediaType.APPLICATION_JSON })
    public Object checkLoginStatus(Object a) {
      // Check login status function
    }

I was reading about something with a HashMap which may work or maybe casting my Object with an inside class into the same method.

Any Ideas? Thanks.

Besides my answer, I'd like to ask what are you trying to achieve by consuming different objects in one method? Probably there's some easier solution. — Aleksei Budiak, Aug 22 '17 at 17:02
@AlekseiBudiak Your answer looks great, And works for these simple json, but I wanted skip the mapping with a bean when I have a nested json, something like do a temporal class only for deserialize but without create it. — Juan BG, Aug 22 '17 at 17:12
That solution should work with any JSON object (including the one with nested objects). There's alternative to what I've suggested - [MessageBodyReaders](https://jersey.github.io/documentation/latest/message-body-workers.html#d0e6838). You can use them to add custom deserialization logic to Jersey. Unfortunately, there's no easy way to have some kind of temporal class specific to the request. — Aleksei Budiak, Aug 22 '17 at 17:28
@Jarrod Roberson this is not a duplicate of any of the linked questions. Please read carefully. — Aleksei Budiak, Aug 24 '17 at 21:01

score 0 · Accepted Answer · answered Aug 22 '17 at 16:56

You can achieve consuming anything by a single method by specifying String parameter type.

@Path("/loginCheck")
@POST
@Consumes({ MediaType.APPLICATION_JSON })
@Produces({ MediaType.APPLICATION_JSON })
public Object checkLoginStatus(String pureJsonString) {
}

The Map representation is available only for application/x-www-form-urlencoded MIME type, so it's not your case if you want to consume JSON. You can read more about this topic in Jersey docs.

score 0 · Answer 2 · answered Aug 23 '17 at 16:16

Based in Aleksei answer, I found a solution I post it hoping that it helps to someone:

            @Path("/loginCheck")
            @POST
            @Consumes({ MediaType.APPLICATION_JSON })
            @Produces({ MediaType.APPLICATION_JSON })
            public Object checkLoginStatus(String a) {
                JSONObject jsonAnswer = new JSONObject();
                ObjectMapper mapper = new ObjectMapper();
                try {
                    JsonNode rootNode = mapper.readTree(a);
                    System.out.println(rootNode.get("id").getIntValue());

                } catch (JsonProcessingException e) {
                    e.printStackTrace();
                }
            }

Jersey generic object

2 Answers2