using version 4.1.6.Final, an entity extends @MappedSuperclass

@MappedSuperclass
public abstract class AbstractPersistable<PK extends Serializable>

with id

@Id
private PK id;

type information :

Metamodel metamodel = entityManager.getMetamodel();
EntityType<?> entityType = metamodel.entity(TableMetaData.class);
entityType.getIdType().getJavaType()

results only in Serializable

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