Mapping problem

logifu · **Joined:** Sun Jan 06, 2008 7:52 am **Posts:** 3

I have a problem with mapping. Maybe some one can help me.

Code:

@Entity
@Table(name="A")
Public class A{
   private List<ArrayList<ArrayList<B>>> bs = 
              new ArrayList<ArrayList<ArrayList<B>>>();

    @OneToMany
    public  List<ArrayList<ArrayList<B>>> getBs(){
                     return bs;
     }

    public void setBs(List<ArrayList<ArrayList<B>>> bs){
                this.bs = bs;
    }
}

Code:

@Entity
@Table(name="B")
Public class B{
    private String name;

    public  String getName(){
         return this.name;
    }

    public void setName(String name){
         this.name = name;
  }
}

Here is the Exception

Code:

State: FAILED
  Reason: org.hibernate.AnnotationException: Use of @OneToMany or @ManyToMany targeting an unmapped class: A.bs[java.util.ArrayList]

can Hibernate not support the datastructure List<ArrayList<ArrayList<B>>>?

gonzao_diaz · **Joined:** Mon Nov 26, 2007 2:29 pm **Posts:** 443

Well, in principle, children are indicated as some sort of simple collection (a Set, a List), not as a collection of collections, nor anything that complicated.

If you want several "levels" of collections, you should rethink your design so that there are more entities in the middle, each containing a simple collection.