用同樣的標識值不同的對象已經與會話錯誤上保存

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Spring + Hibernate : a different object with the same identifier value was already associated with the session 用同樣的標識值不同的對象已經與會話錯誤上保存

我已經與我的休眠註釋問題有關。我有兩個類之間的雙向關係。這裏的映射（感謝axtavt）：

@Entity 
public class Receipt implements Serializable { 
    @Id 
    @GeneratedValue(strategy=GenerationType.AUTO) 
    private Long id; 
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "receipt") 
    private List<Collection> collections; 
    ... 
}  

@Entity 
public class Collection implements Serializable { 
    @Id 
    @GeneratedValue(strategy=GenerationType.AUTO) 
    private Long id; 
    @ManyToOne 
    @JoinColumn(name="ReceiptId") 
    private Receipt receipt; 
    ... 
}

但是，當我嘗試保存我的收據收藏列表使用：

Receipt r = new Receipt(); 
List<Collection> cols = new ArrayList<Collection>(); 
cols.add(new Collection()); 
r.setCollections(cols); 
getHibernateTemplate().save(r);

它生成此錯誤：

org.springframework.orm.hibernate3.HibernateSystemException: a different object with the same identifier value was already associated with the session: [com.coa.acctreports.pojo.Collection#0]; nested exception is org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [com.coa.acctreports.pojo.Collection#0] 
at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:679) 
at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:412) 
at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:411) 
at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374) 
at org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:683) 
at com.coa.acctreports.daoImp.AccountingReportsImpl.save(AccountingReportsImpl.java:35) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

但是當我改變它到

session.merge(receipt)

它沒有錯誤，但是當我檢查我的數據庫在colllections表上的receiptId fk設置爲空...任何幫助表示讚賞。謝謝^ _^...

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2010-11-16 mileesah

你確定你沒有初始化'Collection.id'爲0？由於它是自動生成的，所以在保存之前它應該是'null'。 – axtavt 2010-11-16 13:04:59

是的，我不把collection.id設置爲0.感謝您的回覆 – mileesah 2010-11-16 14:03:47

的mappedby註解放在Receipt指Collection實際上是關係，這顯然不是您的本意，因爲你對Receipt級聯的擁有方。

您應該刪除的Receipt的mappedby並按照Hibernate文檔的例子：

@Entity 
public class Receipt implements Serializable { 
    @Id 
    @GeneratedValue(strategy=GenerationType.AUTO) 
    private Long id; 
    @OneToMany(cascade = CascadeType.ALL) 
    @JoinColumn(name="ReceiptId") 
    private List<Collection> collections; 
    ... 
}  

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

    @ManyToOne 
    @JoinColumn(name="ReceiptId",insertable=false,updatable=false) 
    private Receipt receipt; 
    ... 
}

使用您有上述相同的代碼來執行保存應該工作。

在燈架上有一些在這裏的更多信息：http://docs.jboss.org/hibernate/annotations/3.5/reference/en/html_single/

來源

2010-11-16 17:21:35 StevenWilkins

用同樣的標識值不同的對象已經與會話錯誤上保存

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