How solve javax.persistence.EntityNotFoundException with JPA (not by using @NotFound)

Question

We are using JPA to load some stuff from a database. Some entities may have optional relationships between them, e.g.

@Entity
public class First {
    ....
    @         


        

Answer 1

It happens when you delete the associated entity id. In my case I had Product table depending upon Brand table. I deleted a row or an entity of brand id to which one of the product instance was depending upon.