Hello,
I've a problem with requests on sublasses of a class tree (Entity beans). I got
a org.hibernate.WrongClassException when trying to access data with a oneToMany
relation.
My architecture is:
A <---- B <---- C
| @Entity
| @Table(name = "A")
| @Inheritance(strategy = InheritanceType.SINGLE_TABLE)
| @DiscriminatorColumn(name = "DTYPE", discriminatorType =
DiscriminatorType.STRING)
| @DiscriminatorValue("A_TYPE")
| public class A implements java.io.Serializable {
|
| private Long id;
| ...
| }
|
| @Entity
| @DiscriminatorValue("B_TYPE")
| public class B extends A {
|
| // Associations
| private Collection<Obj> objSet = new ArrayList<Obj>();
|
| @OneToMany(mappedBy = "A")
| public Collection<Review> getObjSet() {
| return objSet;
| }
|
| public void setObjSet(Collection<Obj> objSet) {
| this.objSet = objSet;
| }
| }
|
| @Entity
| @DiscriminatorValue("C_TYPE")
| public class C extends B {
| ...
| }
|
|
And Obj is defined like:
| @Entity
| @Table(name = "OBJ")
| public class Obj {
| private B value;
|
| @ManyToOne
| @JoinColumn(name="A_ID")
| public AppPOI getValue() {
| return value;
| }
|
| public void setValue(B value) {
| this.value = value;
| }
|
| }
|
When I create a new Obj and associate it to a B Entity it works. (correctly
added to the DB, good ID pointing from OBJ to a "A like" entry)
Now when I try to access using this request:
SELECT obj FROM Obj obj WHERE obj.value.id=44549450
It gives me that error message:
| org.hibernate.WrongClassException: Object with id: 44549450 was not of the
specified subclass: C (Discriminator: B_TYPE)
|
I'm using using jboss 4.0.5 with seam and hibernate updated to version 3.2.5ga
Thanks for your help, I couldn't find an answer to my problem with the search
function of this forum, I've passed so many times reading it at this point...
Paulin
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