This class shows some code for the callback of a Janrain (formerly Rpx Now) login using the Play Framework

Login.java

package controllers;

import com.google.gson.JsonElement;
import play.Play;
import java.util.Properties;
import play.libs.WS;
import play.libs.WS.WSRequest;
import play.mvc.Controller;

/**
 * This class is for the callback of a Janrain(formerly RPXNow) login.
 */
public class Login extends Controller {

    public static void tokenCallback(String token) {
        Properties p = Play.configuration;
        // Try the driver
        String rpxApi = p.getProperty("login.rpx.apiKey");
        

        WSRequest rpxRequest = WS.url("http://rpxnow.com/api/v2/auth_info");
        // get RPX
        rpxRequest.setParameter("token", token);
        rpxRequest.setParameter("apiKey", rpxApi);

        JsonElement rpxJson = rpxRequest.get().getJson();
        JsonElement profile = rpxJson.getAsJsonObject().get("profile");
        String identifier = profile.getAsJsonObject().getAsJsonPrimitive("identifier").getAsString();

        welcome(identifier);

    }

    public static void welcome(String id) {
        render(id);
    }
}

use getAsJsonPrimitive()