Table per subclass inheritance relationship: How to query against the Parent class without loading any subclass ??? (Hibernate)

Question

Suppose a Table per subclass inheritance relationship which can be described bellow (From wikibooks.org - see here)

Notice Parent class is n

Answer 1

Actually, there is a way to get just the superclass, you just need to use the native query from JPA, in my case I'm using JPA Repositories it would be something like that:

@Query(value = "SELECT * FROM project", nativeQuery = true)
List findAllProject();

The flag nativeQuery as true allow running the native SQL on database.

If you are using Entity Manager check this out: https://www.thoughts-on-java.org/jpa-native-queries/