Using json with Play 2

Question

I'm trying to create a simple application that allows me to create, read, update and delete various users. I have a basic UI-based view, controller and model that work, but wanted to be more advanced than this and provide a RESTful json interface. However, despite reading everything I can find in the Play 2 documentation, the Play 2 Google groups and the stackoverflow website, I still can't get this to work. I've updated my controller based on previous feedback and I now believe it is based on the documentation. Here is my updated controller: ``` package controllers; import models.Member; import play.*; import play.mvc.*; import play.libs.Json; import play.data.Form; public class Api extends Controller { /* Return member info - version to serve Json response */ public static Result member(Long id){ ObjectNode result = Json.newObject(); Member member = Member.byid(id); result.put("id", member.id); result.put("email", member.email); result.put("name", member.name); return ok(result); }…

Accepted Answer

There appear to be conflicts in the use of the `Json` class in the Play 2 documentation. To get the example above working correctly, the following imports are used:

```
import play.mvc.Controller;
import play.mvc.Result;
import play.mvc.BodyParser;                     
import play.libs.Json;
import play.libs.Json.*;

import static play.libs.Json.toJson;

import org.codehaus.jackson.JsonNode;           
import org.codehaus.jackson.node.ObjectNode;

@BodyParser.Of(play.mvc.BodyParser.Json.class)
public static index sayHello() {
    JsonNode json = request().body().asJson();
    ObjectNode result = Json.newObject();
    String name = json.findPath("name").getTextValue();
    if(name == null) {
        result.put("status", "KO");
        result.put("message", "Missing parameter [name]");
        return badRequest(result);
    } else {
        result.put("status", "OK");
        result.put("message", "Hello " + name);
        return ok(result);
    }
}
```

Note the explicit calling of the right `Json` class in `@BodyParser`

I'm not sure if this is a bug or not? But this is the only way I could get the example to work.

Using json with Play 2

Solution

Problem