JPA 2 / 休眠孤儿删除仍然无法与@OneToMany？

我试图在Hibernate 4.3.5 / JPA2对象中使用orphanRemoval，但它似乎没有像我预期的那样工作。但是，我不确定我是否在做不正确的事情，或者这是否仍然是Hibernate中的一个错误。

给定以下关系（@Version，为简洁起见，省略了 getter 和 setters）：

@Entity
public class Provider implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    private String name;

    @OneToMany(orphanRemoval=true,cascade=CascadeType.REMOVE)
    @JoinColumn(name="provider_id", referencedColumnName="id")
    private List<Contract> contracts;
}


@Entity
public class Contract implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    private String volume;

    @OneToMany(orphanRemoval=true,cascade=CascadeType.REMOVE) // delete any attachments that were previously uploaded with this contract
    @JoinTable(name="contract_attachment", joinColumns = @JoinColumn(name = "contract_id", referencedColumnName = "id"), inverseJoinColumns = @JoinColumn(name = "attachment_id", referencedColumnName = "id"))
    private List<Attachment> attachments;
}

@Entity
public class Attachment implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    private String filename;
}

我希望如果我从 Provider.contract 列表中删除一个协定，它将从协定表中删除相应的行，并从附件表中删除所有关联的附件。但是，只有协定表会被删除。不修改附件表。

前任：

    // loop over all contracts and delete the one with the matching id
    for(Iterator<Contract> it = provider.getContracts().iterator(); it.hasNext();){
        Contract c = it.next();
        if( c.getId() == contractId ){
            it.remove();
            break;
        }
    }

假设附件相对于“协定”表是 ManyToOne，如果删除了“协定”，则附件是孤立的。但即使使用 ，这也不会从 DB 中删除行。orphanRemoval=true

我发现Hibernate 3（在SO上，Jira和其他地方在线）发现了几个与此相关的问题，但我已经知道它在Hibernate 4中已修复。但是使用Hibernate 4.3.5我仍然看到这个问题。从这个问题来看，它似乎有效，所以我不确定为什么我不能让它正常工作。

我的代码中是否有错误/缺失，或者Hibernate仍然有问题？我是否需要在这些实体类中实现和实现才能正常工作？我尝试在合约和附件中实现这两种方法，但没有区别。equalshashCodeorphanRemoval

查看 Hibernate 日志，它显示 Hibernate 对联接表（或 FK 映射）进行了更改，但实际上并没有从关联表中删除该行。我可以看到Hibernate在Contrace表中设置provider_id=null，但是它不应该删除Contrace行吗？

2014-07-04 15:06:41,333 [main] [-] DEBUG org.hibernate.SQL - 
    /* update
        com.ia.domain.Provider */ update
            provider 
        set
            default_contact_id=?,
            name=?,
            type=?,
            version=?,
            website=? 
        where
            id=? 
            and version=?
Hibernate: 
    /* update
        com.ia.domain.Provider */ update
            provider 
        set
            default_contact_id=?,
            name=?,
            type=?,
            version=?,
            website=? 
        where
            id=? 
            and version=?
2014-07-04 15:06:41,334 [main] [-] TRACE hibernate.type.descriptor.sql.BasicBinder - binding parameter [1] as [BIGINT] - [null]
2014-07-04 15:06:41,334 [main] [-] TRACE hibernate.type.descriptor.sql.BasicBinder - binding parameter [2] as [VARCHAR] - [name_3]
2014-07-04 15:06:41,335 [main] [-] TRACE org.hibernate.type.EnumType - Binding [CARRIER] to parameter: [3]
2014-07-04 15:06:41,336 [main] [-] TRACE hibernate.type.descriptor.sql.BasicBinder - binding parameter [4] as [INTEGER] - [2]
2014-07-04 15:06:41,336 [main] [-] TRACE hibernate.type.descriptor.sql.BasicBinder - binding parameter [5] as [VARCHAR] - [website_3]
2014-07-04 15:06:41,337 [main] [-] TRACE hibernate.type.descriptor.sql.BasicBinder - binding parameter [6] as [BIGINT] - [4]
2014-07-04 15:06:41,338 [main] [-] TRACE hibernate.type.descriptor.sql.BasicBinder - binding parameter [7] as [INTEGER] - [1]
2014-07-04 15:06:41,342 [main] [-] DEBUG org.hibernate.SQL - 
    /* delete one-to-many com.ia.domain.Provider.contracts */ update
            contract 
        set
            provider_id=null 
        where
            provider_id=?
Hibernate: 
    /* delete one-to-many com.ia.domain.Provider.contracts */ update
            contract 
        set
            provider_id=null 
        where
            provider_id=?
2014-07-04 15:06:41,344 [main] [-] TRACE hibernate.type.descriptor.sql.BasicBinder - binding parameter [1] as [BIGINT] - [4]