Question

i have a relation (one to many/ many to one) between parent and child in my code like this

The Parent

@JsonAutoDetect
@Entity
@Table(name = "Parent")
public class Parent{

    private Integer id;
    private List<Child> childs;

    @Id
    @GeneratedValue(strategy= GenerationType.AUTO)
    @Column (name="idparent")
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }

    @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL)
    @LazyCollection (LazyCollectionOption.FALSE)
    public List<Child> getChilds() {
        return childs;
    }
    public void setChilds(List<Child> childs) {
        for (Child child: childs) {
            child.setParent(this);
        }
        this.childs= childs;
    }
}

and the child

@JsonAutoDetect
@Entity
@Table(name="Child")
public class Child{

    private Integer id;
    private Parent parent;

    @Id
    @GeneratedValue(strategy= GenerationType.AUTO)
    @Column (name = "idchild")
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }

    @ManyToOne(fetch = FetchType.EAGER)
    @NotFound(action = NotFoundAction.IGNORE)
    @JoinColumn(name = "idparent")
    @JsonIgnore
    public Parent getParent() {
        return parent;
    }
    public void setParent(Parent parent) {
        this.parent= parent;
    }
}

Everything is ok but when i do somthink like

parent.getChilds().remove(child);
session.update(parent);

the child is’nt removed from the table, what is the problem, can you help me please,
sorry for my bad english 🙁

Answer 1

child should not be removed from the database in this case. If that is the behavior you want, you need to enable “orphan removal”:

@OneToMany(mappedBy = "parent", cascade = CascadeType.ALL, orphanRemoval=true)
@LazyCollection (LazyCollectionOption.FALSE)
public List<Child> getChilds() {
    return childs;
}