I have these 2 classes :

```
public class E1 {
     int id;
     E2 e;
     // getters and setters 
}

public class E2 {
    int id;
    // attributes, getters and setters
}

```

What would be the right JPA Query that will return the right E2 instance using E1 id attribute ?

```
E2 findE2ByE1Id(int E1Id)
{
    // which query here?
}

```