[hibernate-dev] HHH-5024 : MappedSuperclass and Static Metamodel Generator

[Steve Ebersole]

I should point out... this *only* fails when the entity 
(ProductAttribute) is annotated with an @IdClass

On Mon 09 Jan 2012 03:06:51 PM CST, Steve Ebersole wrote:
> There is definitely an issue here. The code in HEM is just wrong. I am 
> not familiar enough with the code/spec here in regards to static 
> metamodel generation to determine the appropriate fix on my own.
>
> The model in question there is essentially:
>
> @MappedSuperclass
> abstract class AbstractAttribute {
> protected String key;
> protected String value;
>
> public abstract String getOwner();
>
> @Column(name = "attribute_key")
> public String getKey() { return key; }
>
> @Column(name = "attribute_value")
> public String getValue() { return value; }
>
> // setters
> }
>
> then we have:
>
> @Entity
> public class ProductAttribute extends AbstractAttribute {
> private String owner;
>
> @Id @Column(name = "owner")
> public String getOwner() { return owner; }
>
> @Id @Column(name = "attribute_key")
> public String getKey() { return key; }
>
> // setters
> }
>
> The attributes in question are the 2 (key,owner) that get overridden 
> in the subclass. We end up with a mismatch.
>
> The metamodel generator does:
>
> @StaticMetamodel(AbstractAttribute.class)
> public abstract class AbstractAttribute_ {
>
> public static volatile SingularAttribute<AbstractAttribute, Integer> 
> owner;
> public static volatile SingularAttribute<AbstractAttribute, String> 
> value;
> public static volatile SingularAttribute<AbstractAttribute, String> key;
> }
>
> @StaticMetamodel(ProductAttribute.class)
> public abstract class ProductAttribute_ extends AbstractAttribute_ {
> }
>
> In the type system however only value shows up as "declared" by 
> AbstractAttribute. These other 2 show up as being declared by 
> ProductAttribute, presumably because that is where there ultimate 
> metadata is defined.
>
> I think the metamodel is defined correctly, but then that leaves a 
> question as to how we handle that for the type system 
> (org.hibernate.mapping.MappedSuperclass).
>

-- 
steve at hibernate.org
http://hibernate.org