Spring数据多对多，获取其关系不包含项的所有实体

@Entity
public class A {
    @Id
    private Long id;
    
    @ManyToMany
    private List<B> bs;
    
    // getters and setters
}

@Entity
public class B {
    @Id
    private Long id;
    
    @ManyToMany(mappedBy = "bs")
    private List<A> as;
    
    // getters and setters
}

@Repository
public interface ARepository extends JpaRepository<A, Long> {
    @Query("SELECT a FROM A a WHERE NOT EXISTS (SELECT b FROM a.bs b WHERE b.id = :bId)")
    List<A> findAllWithoutB(@Param("bId") Long bId);
}

@Service
public class AService {
    @Autowired
    private ARepository aRepository;
    
    public List<A> findAllWithoutB(Long bId) {
        return aRepository.findAllWithoutB(bId);
    }
}

@Controller
public class AController {
    @Autowired
    private AService aService;
    
    @GetMapping("/a")
    public String findAllWithoutB(@RequestParam("bId") Long bId, Model model) {
        List<A> aList = aService.findAllWithoutB(bId);
        model.addAttribute("aList", aList);
        return "aList";
    }
}