Expected JsonObject but was JsonPrimitive

Question

I am using retrofit to parse JSON. I'm getting an exception while parsing a JSON response. My response is dynamic means that when I'm getting a successful response the response key is successful, but when I'm getting a fail response it turns to an error. How can I parse that response?

When I'm getting a fail response it's giving me a proper result, but when I'm getting a successful response it's going to end in failure and gives me an exception that Expected JsonObject but was JsonPrimitive.

Solution 1

I had a similar problem where server returned sometimes a JsonObject and sometimes a JsonPrimitive. When JsonPrimitive was returned I got 200 OK but it still ends up in onFailure because the types differed ( It expected a JsonObject but found a JsonPrimitive ).

public final class JsonPrimitive extends JsonElement

public final class JsonObject extends JsonElement

The com.google.gson documentation states that booth JsonPrimitive and JsonObject extend JsonElement so why not do:

JsonObject jsonObject = createJsonObject();
Call<JsonElement> requestCall = SomeInterface.sendRequest(jsonObject);
requestCall.enqueue(new Callback<JsonElement>() {
    @Override
    public void onResponse(Call<JsonElement> call, Response<JsonElement> response) {
        //Now when you get a JsonPrimitive it will still end up here because 
        //JsonPrimitive extends JsonElement
    }

    @Override
    public void onFailure(Call<JsonElement> call, Throwable t) {
    
    }
}

Solution 2

Jsonobject and jsonprimitive is different type each other .

JsonObject { "name":"John", "age":30, "car":null }

JsonPrimitive (string, number, boolean)

Your response model is wrong . try this .

http://www.jsonschema2pojo.org/