Bug休眠OneToMany / ManyToOne

Question

I'm trying to make a relationship using OneToMany and ManyToOne, but when I try to insert a record into database without add a object(class) in the list OneToMany, the hibernate try to insert the record OneToMany anyway. Example: Employee Class:

@Entity
public class Employee implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, orphanRemoval = true, mappedBy="employee")
    private List<Shift> shifts = new ArrayList<Shift>();
}

Shift Class:

@Entity
public class Shift implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.DETACH)
    @JoinColumn(name="EMPLOYEE_ID")
    private Employee employee;
}

When I try to insert the record:

Employee employee = new Employee();
entityManager.persist(employee);
entityManager.flush();

How can I fix it? I'm using SQL Server Database.

14:53:49,660 INFO  [stdout] (default task-20) Hibernate: insert into Employee
14:53:49,762 INFO  [stdout] (default task-20) Hibernate: insert into Shift(EMPLOYEE_ID) values (?)

Answer 1

As per my understanding,It is because of you have specified cascade = CascadeType.ALL in the Employee class.

@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, orphanRemoval = true, mappedBy="employee")
    private List<Shift> shifts = new ArrayList<Shift>();

Which means,when you will make any operation on Employee object,it will cascade it to Shift class too,due to this.

For ref see here :- CascadeType