Question

I’m using google-http-java-client-1.10.3-beta for making RESTfull Json requests to a service provided by an external source.

I need to parse the Json that’s coming in the response to build some POJOs to my app.

For that, I’m using HttpResonse method ‘parse as’:

response.parseAs(SomeModel.class)

But I’m getting this exception:

java.lang.IllegalArgumentException: No parser defined for Content-Type: application/json
    at com.google.api.client.http.HttpResponse.parseAs(HttpResponse.java:497)

The responded json has this format:
[{“key” : {“key” : “value”, “key” : “value”}}]

I had experminted some issues with other Json libraries when handling responses with square brackets, could that be the problem here?

Any ideas?

Answer 1

Responding to myself, the api needs you to set manually a JsonObjectParser object to the request involved.

A JsonObjectParser might be a GsonParser or JacksonParser or any other implented parser.

So, in order to set a GsonParser to your request you could use this code:

HttpRequest setJsonParser(HttpRequest request) {
    JsonObjectParser parser = new JsonObjectParser(new GsonFactory());
    return request.setParser(parser);
}

Then you will be able to do:

HttpRequest request = setJsonParser(request).execute().parseAs(SomeModel.class);

And all your POJOs will be automatically generated.

Note: I’ve upgraded my google-http-java-client version to 1.11.0-beta, an earlier version won’t return a HttpRequest object when calling setParser so be carefull when using the presented code, you may need a void instead of a function.