Re: [eclipselink-users] @Embeddable and @mapsId

[luke2010 <weiquan.yuan@xxxxxxxxx>]

Chris, thanks for your solution. I followed it, and type the snippet below:
=======
@Entity 
    public class A { 
       @EmbeddedId APK id; 
        ... 
      @OneToOne(optional=false, mappedBy="a", cascade = ALL, targetEntity =
B.class) 
      @PrivateOwned 
      private B b; 
       ... 
    } 

    @Entity 
    public class B { 
       @EmbeddedId APK id; 
        ... 
                
        
       @OneToOne(optional = false) 
        @JoinColumns({ 
                @JoinColumn(name="A_ID", referencedColumnName="A_ID"), 
                @JoinColumn(name="B_ID", referencedColumnName="B_ID"), 
                }) 
                @MapsId
                private A a; 
    } 
  
  
  @Embeddable 
    public class BPK { 
                @Column(name="A_ID") 
       int aId name; 
            
           @Column(name="B_ID") 
       long bId; 
    } 
===============================

I tried @MapsId or @MapsId("id"), either of them works for me. and here is
the error message I got 
----------------
Thread(Thread[Main Thread,5,main])--Exception [EclipseLink-32] (Eclipse
Persistence Services - 2.0.1.v20100213-r6600):
org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Trying to set value [10005699] for instance variable
[id] of type [com.entities.copy.APK] in the object.  The specified object is
not an instance of the class or interface declaring the underlying field, or
an unwrapping conversion has failed.
Internal Exception: java.lang.IllegalArgumentException: Can not set
com.entities.copy.APK field com.entities.copy.B.id to java.lang.String
Mapping: org.eclipse.persistence.mappings.AggregateObjectMapping[id]

===================================

luke2010 wrote:
> 
> here is one scenario
> there are two entity A, B, A has PK class APK including aId, bId, B has
> BPK class including aId, bId as well. they have oneToone relationship. Can
> I use annotation @MapsId on @OnetoOne relationship on entity B? 
> 
> ==========================
>     @Entity
>     public class A {
>        @EmbeddedId APK id;
>         ...
> 		
>        
>       @OneToOne(optional=false, mappedBy="a", cascade = ALL, targetEntity
> = B.class)
>       @PrivateOwned
>       private B b;
>        ...
>     } 
> 
>     @Entity
>     public class B {
>        @EmbeddedId BPK id;
>         ...
> 		
>        
>        @OneToOne(optional = false)
> 	@JoinColumns({
> 		@JoinColumn(name="A_ID", referencedColumnName="A_ID"),
> 		@JoinColumn(name="B_ID", referencedColumnName="B_ID"),
> 		})
> 		@MapsId ??????
> 		private A a;
>     }
>  
>  
>   @Embeddable
>     public class BPK {
> 		@Column(name="A_ID")
>        int aId name;
> 	   
> 	   @Column(name="B_ID")
>        long bId; 
>     }
> ======================================
> I tried @MapsId at the question mark location, but I don't know which
> attribute name to provide. If i dont' provide anything, i got error below: 
> 
> ---------------------------------
> Caused by: Exception [EclipseLink-7316] (Eclipse Persistence Services -
> 2.0.1.v20100213-r6600):
> org.eclipse.persistence.exceptions.ValidationException
> Exception Description: The mapped by id value [a] from the mapping
> attribute [field a] is invalid. An equivalent attribute with that name
> must be defined on the id class [class com.package.BPK]
> 

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