Resolve AnnotationBasedGenerator type argument through class hierarchy

[stewue]

I wanted to file this as a JIRA issue, but I always get a permission error whentrying to create a ticket, so I'm posting it here instead. -> I reported issue in https://discourse.hibernate.org/t/annotationbasedgenerator-is-not-initialized-when-the-interface-is-implemented-by-an-abstract-superclass-instead-of-the-concrete-class-after-upgrading-to-hibernate-7-3-7-4/12354. Here is the PR with an accompanying test.

Example

Abstract base class implementing the interface:

  public abstract class AbstractGeneration<T extends Annotation> implements BeforeExecutionGenerator, AnnotationBasedGenerator<T> {

      @Override
      public void initialize(T annotation, GeneratorCreationContext context) {
          // ...
      }
  }

Concrete generator referenced by a @ValueGenerationType annotation:

  public class ConcreteFieldGeneration extends AbstractGeneration<CustomAnnotation> {
      // does NOT declare "implements AnnotationBasedGenerator<CustomAnnotation>"
  }

Since 7.3/7.4 Hibernate fails to with AssertionFailure: "Could not find implementing interface". The change was introduced by

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license
and can be relicensed under the terms of the LGPL v2.1 license in the future at the maintainers' discretion.
For more information on licensing, please check here.

---

---

Please make sure that the following tasks are completed:
Tasks specific to HHH-20614 (Bug):

• Add test reproducing the bug
• Add entries as relevant to migration-guide.adoc OR check there are no breaking changes

https://hibernate.atlassian.net/browse/HHH-20614

[hibernate-github-bot]

Thanks for your pull request!

This pull request appears to follow the contribution rules.

› This message was automatically generated.

[beikov]

Changes look good to me, but we need

• Jira ticket
• Commit message use the Jira key
• Test refer to the Jira link via @Jira("...")

[stewue]

@beikov I've addressed the points from your comment. Is there anything I need to do on my end (Jenkins CI is "in progress" after hours)?

[beikov]

Please run ./gradlew spotlessApply to fix the code style errors.