休眠多对多与连接类级联问题

我有一个 Many-to-Many 班级关系 Foo 和 Bar FooBar 如下所述: The best way to map a many-to-many association with extra columns when using JPA and Hibernate

我创建了一个Foo,并创建了一些条(保存到DB)。当我使用

foo.addBar(bar);            // adds it bidirectionally
barRepository.save(bar);    // JpaRepository

但是当我想再次从foo中删除相同的条时,使用

foo.removeBar(bar);         // removes it bidirectionally
barRepository.save(bar);    // JpaRepository

通过调试我看到 foo.removeBar(bar);

我做错什么了吗? 我很确定这与级联选项有关,因为我只保存了条。

我尝试过:

• orphanRemoval = true 在两个@OneToMany-annotations上,这都不起作用。我认为这是正确的,因为我不知道 既不是Foo也不是Bar,只是他们的关系。

• 从@OneToMany注释中排除CascadeType.REMOVE,但与orninremove相同,我认为这不适用于这种情况。

编辑: 我怀疑在我的代码或模型中一定有什么东西干扰了我的删除,因为现在已经有两个答案说它可以工作(与 orphanRemoval=true ).

原来的问题已经回答,但如果有人知道什么可能导致我的孤儿搬迁不工作,我将非常感谢你的意见。谢谢

public class Foo {

    private Collection<FooBar> fooBars = new HashSet<>();

    // constructor omitted for brevity

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "foo", fetch = FetchType.EAGER)
    public Collection<FooBar> getFooBars() {
        return fooBars;
    }

    public void setFooBars(Collection<FooBar> fooBars) {
        this.fooBars = fooBars;
    }

    // use this to maintain bidirectional integrity
    public void addBar(Bar bar) {
        FooBar fooBar = new FooBar(bar, this);

        fooBars.add(fooBar);
        bar.getFooBars().add(fooBar);
    }

    // use this to maintain bidirectional integrity
    public void removeBar(Bar bar){
        // I do not want to disclose the code for findFooBarFor(). It works 100%, and is not reloading data from DB
        FooBar fooBar = findFooBarFor(bar, this); 

        fooBars.remove(fooBar);
        bar.getFooBars().remove(fooBar);
    }

}

public class Bar {

    private Collection<FooBar> fooBars = new HashSet<>();

    // constructor omitted for brevity

    @OneToMany(fetch = FetchType.EAGER, mappedBy = "bar", cascade = CascadeType.ALL)
    public Collection<FooBar> getFooBars() {
        return fooBars;
    }

    public void setFooBars(Collection<FooBar> fooBars) {
        this.fooBars = fooBars;
    }
}

public class FooBar {

    private FooBarId id; // embeddable class with foo and bar (only ids)
    private Foo foo;
    private Bar bar;

    // this is why I had to use this helper class (FooBar), 
    // else I could have made a direct @ManyToMany between Foo and Bar
    private Double additionalInformation; 

    public FooBar(Foo foo, Bar bar){
        this.foo = foo;
        this.bar = bar;
        this.additionalInformation = .... // not important
        this.id = new FooBarId(foo.getId(), bar.getId());
    }

    @EmbeddedId
    public FooBarId getId(){
        return id;
    }

    public void setId(FooBarId id){
        this.id = id;
    }

    @ManyToOne
    @MapsId("foo")
    @JoinColumn(name = "fooid", referencedColumnName = "id")
    public Foo getFoo() {
        return foo;
    }

    public void setFoo(Foo foo) {
        this.foo = foo;
    }

    @ManyToOne
    @MapsId("bar")
    @JoinColumn(name = "barid", referencedColumnName = "id")
    public Bar getBar() {
        return bar;
    }

    public void setBar(Bar bar) {
        this.bar = bar;
    }

    // getter, setter for additionalInformation omitted for brevity
}