Custom Repository returns `Optional` as return type for `T`

[jschmied]

For migrating existing code I have:

@NoRepositoryBean
public interface MyJpaDao<T, ID> extends Repository<T, ID>, QueryByExampleExecutor<T> {
	T findById(ID id);
}

with DAO:

public interface UserDAO extends MyJpaDao<User, Long> {
      
}

i would expect:
User findById(Long id);

but generated is
Optional<User> findById(Long id);

if I duplicate
User findById(Long id);
in UserDAO, it works as expected. Why?

[mp911de]

This is a bug in our QueryExecutionResultHandler component that does not consider the declaring class. It only considers the method signature. Upon resolving T, it resolves against the parameter variable of Repository<T, ID> that resolves to Object instead of considering extends MyJpaDao<User, Long>.