Java – generics and JSON

I'm using the play framework

model:

public class JSONContainer<T> extends Model {

    private T myT;
    private StatusMessage mySm;

    public JSONContainer(T myT,StatusMessage mySm) {
        this.myT = myT;
        this.mySm = mySm;
    }
}

then:

In the functions of controller:

JSONContainer<User> myJ = new JSONContainer(logged,sm);
renderJSON(myJ);

User is recorded and SM is statusmessage I received an error:

type:   'play.exceptions.JavaExecutionException'

If I don't use generics, it works Any ideas?

The console provides this output, where line 43 is:

JSONContainer<User> myJ = new JSONContainer(logged,sm);

Solution

Hibernate cannot map common entities

You should perform generic class abstraction and create a specific implementation (using any other possible values of user and T) This should solve the problem