@Entity
@Table(name = "entity")
@AttributeOverride(name = "id", column = @Column(name = "entityId"))
public class EntityA  {
    private static final long serialVersionUID = 2337915639426837746L;

    @Basic
    @Column(name = "name")
    protected String name;


    @OneToMany(mappedBy = "entity", fetch = FetchType.EAGER, cascade = CascadeType.ALL,orphanRemoval=true)
    private List<EntityB> setAssignmentEntities = new ArrayList<EntityB>();


}

@Entity
@Table(name = "entity_set")
public  class EntityB implements Serializable {

    private static final long serialVersionUID = -7050818401379732731L;
	
	
	    @ManyToOne
    @JoinColumns({
            @JoinColumn(name = "entityId", referencedColumnName = "entityId", updatable = false, insertable = false) })
    EntityA entity;
	@Id
    @Column(name = "entityName")
    private String entityName;


    @Id
    @Column(name = "fieldId")
    private int fieldId;


}