使用Spring Data JPA初始化存储库

Question

image attached after answer from Lorelorelore

basically, I tried to use hibernate in my project, but it became pretty chaotic, so I decided to test it again, so I created a new spring project. I have a POJO - Car class and a CarRepository. As far as I understand, it should use basic methods from the CRUD repository - but, when I want to save a object (or use any other method) it just doesn't work (it shows that I should initialize variable "carRepository"). Could you please help me with that? Thanks in advance

//CARTESTER CLASS

public class CarTester {
    public static void main(String[] args) {

        @Autowired
        CarRepository carRepository;
//I want to use a method from crudrepository here
        carRepository.save(new Car(1, "AAA", "BBB", 1111));
        carRepository.findAll();
    }
}

//CAR CLASS
@Table(name = "CARS")
@Entity
    public class Car {

        @Id
        private Integer id;
        private String brand;
        private String model;
        private int manufactureYear;
//constructors, getters, setters, toString()

//CARREPOSITORY CLASS
@Repository
public interface CarRepository extends CrudRepository<Car, Integer> {


}

Answer 1

Your test class should look like this:

@RunWith(SpringRunner.class)
@DataJPATest
public class CarTester {

 @Autowired
 CarRepository carRepository;

 @Test
 public void test() {
    carRepository.save(new Car(1, "AAA", "BBB", 1111));
    carRepository.findAll();
 }
}