Generic MappedSuperclass

[Diogo Ferreira]

Hello everyone!

I was wondering of generic MappedSuperclasses are supported. I saw an old post saying they were not but it was from 10 years ago so I was wondering if that changed.

What I am trying to do:

I have this MappedSuperclass

@MappedSuperclass
public abstract class LongIDTimestampedEntity<I> extends TimestampedEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id", nullable = false, updatable = false)
    private Long underlyingId;

    @Convert(converter = LongIDAttributeConverter.class)
    @Column(name = "id", nullable = false, insertable = false, updatable = false)
    private LongID<I> id;

But when I try to use it like this:

@Entity
@Table(name = Constants.TableNames.SELECTION_ENGINE_CONTEXT)
public class EntitySelectionEngineContext
    extends LongIDTimestampedEntity<SelectionEngineContext>
    implements SelectionEngineContext {

The generated query entity is trying to import I instead of using SelectionEngineContext.

So is this supported? If so, what am I doing wrong? If not, are there any plans to support it in the future?

Thank you in advance!

[Rob Bygrave]

It looks to me like the issue here is likely related to the generic type used with the AttributeConverter:

    @Convert(converter = LongIDAttributeConverter.class)
    @Column(name = "id", nullable = false, insertable = false, updatable = false)
    private LongID<I> id;

I don't believe AttributeConverter supports a generic type like LongID<I>.

You say "The generated query entity is trying to import I instead ..." ... which implies the generated query bean can't compile. You could try to use the entity bean without generating query beans in order to confirm if the AttributeConverter works as you intend it (but I'm not expecting it to support the generic LongID<I> type).

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