Spring data JPA- Hibernate Many to Many relation is inserting null in link entity table

Question

I have many to many relation between user to role

USER ENTITY:

import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import         


        

Answer 1

try saving the role also, you haven't stored the role after changing it in addrole function in user entity.

Answer 2

UserRole attributes aren’t the table’s primary ID so @Id should not be on these 2.

You should add an ID attribute to UserRole and annotate that with @Id and @GeneratedValue.

The @ManyToOne will result in a foreign key in the database