[jboss-user] [EJB 3.0] - weird problem with loading collections of subclasses

[tuxzilla]

I have a class Listing with two collections reviews and discussions. Both Review and Discussion are subclasses mapped to the same table, distinguished by a discriminator column type. I am using Seam 1.2.1 but the problem is most likely related to the persistence mapping. Here  are the mappings:

  | @Entity
  | @Name("listing")
  | public class Listing implements java.io.Serializable {
  |     ...
  | 
  |     @OneToMany(targetEntity = Review.class, cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "listing")
  |     private Set<Review> reviews = new HashSet<Review>(0);
  | 
  |     @OneToMany(targetEntity = Discussion.class, cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "listing")
  |     private Set<Discussion> discussions = new HashSet<Discussion>(0);
  | 
  | }
  | 
  | 

and


  | @Entity
  | @Name("review")
  | @DiscriminatorValue("review")
  | @Indexed(index="review")
  | public class Review extends com.n2.bo.UserContent implements java.io.Serializable {
  |     ...
  |     @ManyToOne(fetch = FetchType.LAZY)
  | 	@JoinColumn(name = "listingId")
  |      private Listing listing;
  | }
  | 
  | 
  | @Entity
  | @Name("discussion")
  | @DiscriminatorValue("discussion")
  | @Indexed(index="discussion")
  | public class Discussion extends com.n2.bo.UserContent implements java.io.Serializable {
  | ...
  | @ManyToOne(fetch = FetchType.LAZY)
  | @JoinColumn(name = "listingId")
  |    private Listing listing;
  | }
  | 
  | @Entity
  | @Table(name = "user_content")
  | @Name("userContent")
  | @Inheritance(strategy = InheritanceType.SINGLE_TABLE)
  | @DiscriminatorColumn(name = "type",
  |         discriminatorType = DiscriminatorType.STRING)
  | public class UserContent implements java.io.Serializable {
  | ...
  | }
  | 
  | 

The problem I have is that we I load either reviews or discussions of a listing, both reviews and discussions are loaded into one collection, without checking for discriminator value. I verified this with sql statement there was no where type='review' or where type='discussion' clause. Any idea why? 

Thanks.

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