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anthos
 Post subject: OneToMany resulting Correct and Incorrect Associations
PostPosted: Tue Jun 02, 2009 11:31 pm 
Newbie

Joined: Tue Feb 03, 2009 7:26 pm
Posts: 10
I have JPA annotated entity association as below

Code:
@Entity
@Table(name = "COLLECTIONSITE")
public class CollectionSite implements Serializable {
   @OneToMany(mappedBy = "site", fetch = FetchType.LAZY)
   @Where(clause = "EFF_START_DATE <> EFF_END_DATE")
   private Collection<MiscData> miscData;
}

@Entity
@Table(name = "MISC_DATA")
public class MiscData  implements Serializable{
   @ManyToOne
   @JoinColumn(name = "SITE")
   private CollectionSite site;
}


This is resulting the following associations at different app flows. Thanks to Eclipse's Debug Variable panel's Copy Variables feature.

<!-- Correct Association -->
this CollectionSite (id=229)
miscData PersistentBag (id=230)
bag ArrayList<E> (id=271)
elementData Object[10] (id=273)
[0] MiscData (id=274)
site CollectionSite (id=229)
[1] MiscData (id=275)
site CollectionSite (id=229)
[2] MiscData (id=276)
site CollectionSite (id=229)
[3] MiscData (id=277)
site CollectionSite (id=229)
modCount 4
size 4

<!-- InCorrect Association -->
this CollectionSite (id=353)
miscData PersistentBag (id=354)
bag ArrayList<E> (id=357)
elementData Object[10] (id=372)
[0] MiscData (id=373)
site CollectionSite (id=379)
[1] MiscData (id=374)
site CollectionSite (id=379)
[2] MiscData (id=375)
site CollectionSite (id=353)
modCount 3
size 3

Any thoughts on how the parent association is going wrong ?
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anthos
 Post subject: Re: OneToMany resulting Correct and Incorrect Associations
PostPosted: Wed Jun 03, 2009 3:42 am 
Newbie

Joined: Tue Feb 03, 2009 7:26 pm
Posts: 10
This was solved by using IdClass as below for the associated class.
Code:
@Entity
@Table(name = "MISC_DATA")
@IdClass(value = MiscData.IdClass.class)
public class MiscData implements Serializable{
   public static class IdClass implements Serializable{
      @Column(name = "SITE")
      public String siteId;
      @Column(name = "TYPE")
      public String type;
      @Column(name = "EFF_START_DATE")
      public Date startDate;
      @Column(name = "EFF_END_DATE")
      public Date endDate;
   }

   @Id
   @ManyToOne
   @JoinColumn(name = "SITE")
   private CollectionSite site;

   @Id
   @Column(name = "TYPE")
   private String type;
   
   @Id
   @Column(name = "EFF_START_DATE")
   private Date startDate = getInfinite();

   @Id
   @Column(name = "EFF_END_DATE")
   private Date endDate = getInfinite();

   @Column(name = "DATA")
   private String data;
   
   @Basic
   @Column(name= "site", insertable=false, updatable=false)
   public String siteId;
}

There was stranded @Id in the class which caused the error.
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