CODEWITHSUNDEEP
javajsonrestjersey
ddd
ddd

Reputation: 5029

No serializer found for JSONObject while returning JSON for GET request using Jersey

I am using Jersey to implement REST apis. Other than all the endpoints, I wanted to create a about page that lists all the endpoints and their usages. 

@GET
@Produces(MediaType.APPLICATION_JSON)
public Response displayInfo() {
    JSONObject json = createInfoJson();
    return Response.ok(json).build();
}
/////////////////////////////////////////
public static JSONObject createInfoJson() {
    JSONArray ja = new JSONArray();

    JSONObject jo1 = new JSONObject();
    jo1.put("baseurl", "/tests/");
    jo1.put("description", "Basic Information page");
    jo1.put("example", "/tests/");
    ja.put(jo1);

    JSONObject jo2 = new JSONObject();
    jo2.put("baseurl", "/tests/sendmsg");
    jo2.put("description", "Run Kafka Test");
    jo2.put("example", "/tests/sendmsg?count=100");
    ja.put(jo2);
    ja.put(jo2);

    JSONObject json = new JSONObject();
    json.put("name", "Kafka Messaging Test");
    json.put("endpoints", ja);

    return json;
}

When I hit the about page in a browser, I got the following error:

No serializer found for class org.json.JSONObject and no properties discovered to create BeanSerializer 
(to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS)

What is the correct way to return a JSONObject object from Jersey?

Upvotes: 1

Views: 530

Answers (1)

glw
glw

Reputation: 1664

You're trying to serialize JSONObject to JSON, it doesn't work this way (error explains why). But you have at least two options:

  1. Serialize json to String:

    @GET
@Produces(MediaType.APPLICATION_JSON)
public Response displayInfo() {
    JSONObject json = createInfoJson();
    return Response.ok(json.toString()).build();
}

  2. Create Model/POJO for your response and use it instead JSONObject.

Upvotes: 3

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