Static metamodel generation produces uncompilable code under JDK 21

[ledsoft]

When I have a JOPA entity class with fields annotated with annotation with target ElementType.TYPE_USE (for example, Java validation API annotations @NotNull etc.), the static metamodel generator produces uncompilable output, because it attempts to insert the annotation text into the type field definition in the generated static metamodel.

For example, for the following attribute definition:

@NotBlank
@ParticipationConstraints(nonEmpty = true)
@OWLDataProperty(iri = cz.cvut.kbss.termit.util.Vocabulary.s_p_ma_krestni_jmeno)
String firstName;

it produces

public static volatile SingularAttribute<UserAccount, NotBlank String> firstName;

and messes up the imports, adding import String;.

This happens under JDK 21, JDK 17 output is fine. Other annotation targets do not cause this issue, only ElementType.TYPE_USE.