CODEWITHSUNDEEP
retrofit
jakstack
jakstack

Reputation: 2205

Using 'retrofit' library response has null fields

I'm calling a REST service using retrofit. The REST service returns a JSON message. The Java response object has null fields values.

Setup Code:

Gson gson = new GsonBuilder()
        .setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE)
        .create();

RestAdapter restAdapter = new RestAdapter.Builder()
        .setConverter(new GsonConverter(gson))
        .setEndpoint(myEndpoint).build();

restAdapter.setLogLevel(LogLevel.FULL);
SomeService someService = restAdapter
        .create(SomeService.class);

The service interface:

public interface SomeService {
    @POST("/firstParam/{firstParam}/secondParam/{secondParam}")
    MyResponse callService(@Path("firstParam") String firstParam,
            @Path("secondParam") String secondParam, @Body MyRequest request);
}

The Response Pojo:

class MyResponse {
    private String paramOne;
    private String paramTwo;
    private String action;
    private String status;

    //getters and setters
}

But when I call:

MyResponse response = someService.callService("one","two",request);

the fields in response are still null.

I had to use a custom JsonDeserializer to get it working but I'm thinking this is standard stuff it shouldn't need a JsonDeserializer.

Can you suggest an approach that saves me from using a JsonDeserializer ?

Upvotes: 1

Views: 619

Answers (1)

david.mihola
david.mihola

Reputation: 13002

You set setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE) when building your Gson object.

Accordingly, Gson will now try to map the Java field name paramOne to a value with key ParamOne in your JSON. But no such value exists - it is called paramOne, just like in the Java class.

So, try this:

  • leave out the setFieldNamingPolicy(FieldNamingPolicy.UPPER_CAMEL_CASE). (You can still use @SerializedName in cases where you need a different mapping from JSON key to Java field name.)

Upvotes: 2

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