Jpa repository find all with type HashSet

Question

In my Spring Boot application, I have two entities user and authorities. There are three parameters ROLE_USER, ROLE_ADMIN, and ROLE_SYSTEM is assignable to the user as Authority and one user can have multiple authorities. in the user entity I have created join column which joins user and authority, so I can assign multiple authority to a user using Join table, the Entity field is shown below:

@JsonIgnore
@ManyToMany
@JoinTable(
    name = "jhi_user_authority",
    joinColumns = {@JoinColumn(name = "user_id", referencedColumnName = "id")},
    inverseJoinColumns = {@JoinColumn(name = "authority_name", referencedColumnName = "name")})
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
@BatchSize(size = 20)
private Set<Authority> authorities = new HashSet<>();

so, using this field hibernate created the third table which has a user id and authority role. In Repository, I have used Hibernate JPARepository. and using findAll() I am getting all users. Controller:

In Controller:

@GetMapping("/users")
@Timed
@Secured({ AuthoritiesConstants.ADMIN, AuthoritiesConstants.SYSTEM })
public ResponseEntity<List<UserDTO>> getAllUsers(Pageable pageable) {

final Page<UserDTO> page = userService.getAllManagedUsers(pageable);
HttpHeaders headers = PaginationUtil.generatePaginationHttpHeaders(page, "/api/users");
return new ResponseEntity<>(page.getContent(), headers, HttpStatus.OK);
}

In Service:

@Transactional(readOnly = true)
public Page<UserDTO> getAllManagedUsers(Pageable pageable) {
return userRepository.findAll(pageable).map(UserDTO::new);
}

In Repository:

@Repository
public interface UserRepository extends JpaRepository<User, Long> {

    Page<User> findAll(Pageable pageable);
}

I have tried with this in the repository:

 @Query("select users from User users where users.authorities = 'ROLE_USER'")
 Page<User> getAllByAuthoriy(Pageable pageable);

Authority entity:

@Entity
@Table(name = "jhi_authority")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
public class Authority implements Serializable {

   private static final long serialVersionUID = 1L;

   @NotNull
   @Size(max = 50)
   @Id
   @Column(length = 50)
   private String name;

   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }
}

So, Now I have to change the query from findAll to findAllByAuthorities(Pageable pageable, set authorities). but this not works, showing type casting error. How to fetch all that user which role is ROLE_USER?

Answer 1

Here is the solution, I have to write a query for getting users from user table which authority is a user_role. for that, I have to pass a string to match in HashSet.

@Query("select users from User users where 'ROLE_USER' member of users.authorities")
Page<User> getAllByAuthoriy(Pageable pageable);