Generified Associations are not supported by hibernate?

pasha · **Joined:** Sat Nov 27, 2004 4:13 am **Posts:** 137

Hibernate version: Hibernate 3.2 RC2
Hibernate annotations version: Hibernate Annotations RC1

Code:

@Entity
@Table(schema = "cmn", name = "tb_lookup")
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "fk_lkt", discriminatorType = DiscriminatorType.STRING)
@SequenceGenerator(name = SimpleDomainObject.SEQUENCE_ALIAS, allocationSize = 1, sequenceName = "cmn.sq_lookup")
public abstract class Lookup extends SimpleDomainObject {
    @Id
    private Long id;

    @Column(name = "title")
    private String title;

    ...
}

Code:

@Entity
@DiscriminatorValue("account-type")
public class AccountType extends Lookup {
}

and

Code:

@MappedSuperclass
public abstract class LookupAware<L extends Lookup> {
    @Id
    private Long id;

    @ManyToOne
    @JoinColumn("fk_lookup")
    private L lookup;
    ....
}

Code:

@Entity
@Table(name="accountTypeAware")
public class AccountTypeAware extends LookupAware<AccountType > {
    @Column("name")
    private String name;
...
}

Well, in hibernate startup an exception occures:

so it seems that hibernate uses introspection for determining the property types!

I've changed

Code:

@MappedSuperclass
public abstract class LookupAware<L extends Lookup> {
    @Id
    private Long id;

    public abstract L getLookup();

    public abstract void setLookup(L lookup);
    ....
}

Code:

@Entity
@Table(name="agentTypeAware")
public class AccountTypeAware extends LookupAware<AccountType> {
    @ManyToOne(targetEntity = AccountType.class)
    @JoinColumn("fk_lookup")
    private AccountTypelookup;

    @Column("rate")
    private Double rate;

    public AccountTypegetLookup() {
       return lookup;
    }

    public void setLookup(AccountTypelookup) {
       this.lookup = lookup;
    }
...
}

Still same exception happens on hibernate startup! But When I read property types in second solution, the property types are not Lookup and are of its child type!

How can I handle this?