Hibernate映射异常与多个@Id

问题描述：

我有两个实体之间有一个关系。这是我的第一个实体：Hibernate映射异常与多个@Id

@Entity 
    @Table(name = "APPLICATION_DEVICE") 
    public class ApplicationDevice implements Serializable { 
    [...] 
    @Id 
     @ManyToOne 
     @JoinColumn(name = "udid", nullable=false) 
     public Device getDevice() 
     { 
      return device; 
     } 

     public void setDevice(Device device) 
     { 
      this.device = device; 
     } 

     @Id 
     public Long getApplicationId() 
     { 
      return applicationId; 
     } 

     public void setApplicationId(Long applicationId) 
     { 
      this.applicationId = applicationId; 
     } 
[...]

注意它有两个字段primery键：的applicationID和设备（它是作为另一个关系）。

而我的其他企业为：

@Entity 
@Table(name = "SEGMENT_APPLICATION_DEVICES") 
public class SegmentApplicationDevice 
{ 
[...] 

@Id 
    @GeneratedValue 
    public Long getId() 
    { 
     return id; 
    } 

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

    @ManyToOne 
    public ApplicationDevice getApplicationDevice() 
    { 
     return applicationDevice; 
    } 

    public void setApplicationDevice(ApplicationDevice applicationDevice) 
    { 
     this.applicationDevice = applicationDevice; 
    } 

[...]

而这里的休眠的异常，当它试图映射此实体：

Exception constructing service 'HibernateSessionSource': Error invoking service builder method org.apache.tapestry5.hibernate.HibernateCoreModule.buildHibernateSessionSource(Logger, List, RegistryShutdownHub) (at HibernateCoreModule.java:123) (for service 'HibernateSessionSource'): Foreign key (FK5B8CB9821C11FEAE:SEGMENT_APPLICATION_DEVICES [applicationDevice_applicationId])) must have same number of columns as the referenced primary key (APPLICATION_DEVICE [udid,applicationId])

什么，我doint错了吗？谢谢！

答

ApplicationDevice具有由2列组成的组合ID。但是ApplicationDovice的manytoone却没有指定列（应该有2个），所以使用了一个带有“entityname_id”的列的默认值。

要减轻这一点，请指定两个列作为ApplicationDevice的连接列。

Hibernate映射异常与多个@Id

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