return JSONObject with java app engine

Question

I have a cloud endpoint function that returns a json string as response. An api endpoint makes an http request to the cloud function. How can I return the json string response as it is. I tried the following(just as an example)

@ApiMethod(
            name = "json",
            httpMethod = ApiMethod.HttpMethod.GET
    )
    public JsonObject json()
    {
        String item = "{\"name\":\"Josh\",\"sex\":\"male\"}";
        JsonParser jsonParser = new JsonParser();
        return jsonParser.parse(item).getAsJsonObject();

    }

and I get the following message

WARNING: exception occurred while invoking backend method
[INFO] GCLOUD: java.io.IOException: com.fasterxml.jackson.databind.JsonMappingException: JsonObject (through reference chain: endpoints.repackaged.com.google.gson.JsonObject["asInt"]
Caused by: java.lang.UnsupportedOperationException: JsonObject

I understand JSONObject is not part of the supported returned type, I just want to know how I can just output the json string response from the endpoint just as it is

Why do you want to do this?

saiyr
– saiyr

2017-08-28 21:52:08 +00:00
Commented Aug 28, 2017 at 21:52 — saiyr
– saiyr, Commented Aug 28, 2017 at 21:52

Renaud Tarnec · Accepted Answer · 2017-08-27 19:07:43Z

1

What you can do is to wrap your JSON into a String (in your endpoint) and return the wrapper object. You wrapper object could be a simple POJO with only one String attribute. Then on your API consumer side, you just read the string (representing your JSON) and use it as you wish.

answered Aug 27, 2017 at 19:07

Renaud Tarnec

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