POJO to JSON in Play framework

问题:

Trying to get Play 2.0 to return JSON from a POJO. But I recieve the error

The method toJson(Writes<A>) in the type Json is not applicable for the arguments (Product)

And my code is:

public static Result index(String date) {
     Product item = new Product();
    return ok(Json.toJson(item));

   }

Any ideas?

回答1:

Make sure you import the right Json class using import play.libs.Json.

You probably used play.api.libs.Json which is targeted for the Scala API, not the Java API.