I have a API in JavaSpring and i want to know how can i get All “Finances” by user id, relly got stuck on that and i want to send a body to the API that sends a UserId and get all Finance matching the user

@Entity
@Table(name = "finance")
public class Finance {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;

    @ManyToOne
    @JoinColumn(name = "user_id", nullable = false)
    private User user;

    @Column(nullable = false)
    private String title;

    private String description;

    @Column(nullable = false)
    private String date;

    @Column(nullable = false)
    private Integer value;

My code is like this now and i have no idea what i am doing, i try to create the repository just to find out that i dont know to do that

Service:

    public ResponseEntity<Object> GetFinanceByUserId(Integer userId) {
        List<Finance> userFinances = financeRepository.findByUserId(userId);
        return new ResponseEntity<>(userFinances, HttpStatus.OK);
    }

Repository:

public interface FinanceRepository extends JpaRepository<Finance, Integer> {
    List<Finance> findByUserId(Integer userId);
}