Java generics and jackson mapper

Question

Hi I have the following classes:

public class MyRequest {
}

and

public class MyResponse {
}

and

public class Request<T> {
private String code;
private T request;

public setCode(String code) {
   this.code = codel
  }

public setRequest(T request) {
   this.request = request
   }
}

and following service request method:

public MyResponse getMyResponse(Request<MyRequest> myRequest) {
//process
try {
    ObjectMapper mapper = new ObjectMapper();
    String jsonInString = mapper.writeValueAsString(myRequest);
    System.out.println(jsonInString);
  } catch(Exception exp) {}
}

and following Json request is sending from JavaScript;

{
   "code":"TESTCODE",
   "request":null 
}

After I send the request I an getting an Invalid Json error. Can anyone tell me what is wrong with my request Json or something else is wrong..?

Answer 1

By any chance are you using the model 'Request' as an inner class. If yes,

• just try using the modifier static with 'Request'.
• or rather move out the model 'Request' to a separate class

Non-static Inner classes by design contain a reference to the outer-class, which does cause problems in deserialization.

http://www.cowtowncoder.com/blog/archives/2010/08/entry_411.html