How does Spring Boot 4 handle data access with Spring Data JPA?

// Entity class (Jakarta Persistence 3.2)
import jakarta.persistence.*;  // NOT javax.persistence in Boot 4

@Entity
@Table(name = "orders")
public class Order {

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

    @Column(nullable = false)
    private String productId;

    @Enumerated(EnumType.STRING)
    private OrderStatus status;

    // Constructors, getters, setters...
}

// Repository interface: Spring Data handles implementation
public interface OrderRepository extends JpaRepository<Order, Long> {

    // Method name query derivation:
    List<Order> findByStatus(OrderStatus status);
    List<Order> findByProductIdAndStatus(String productId, OrderStatus status);
    Optional<Order> findFirstByProductIdOrderByCreatedAtDesc(String productId);

    // JPQL query:
    @Query("SELECT o FROM Order o WHERE o.status = :status AND o.total > :minTotal")
    List<Order> findHighValueByStatus(
        @Param("status") OrderStatus status,
        @Param("minTotal") BigDecimal minTotal
    );

    // Native SQL query:
    @Query(value = "SELECT * FROM orders WHERE status = ?1", nativeQuery = true)
    List<Order> findByStatusNative(String status);
}

# application.yml JPA configuration:
spring:
  jpa:
    hibernate:
      ddl-auto: validate     # validate, update, create, create-drop, none
    show-sql: false
    properties:
      hibernate:
        format_sql: true
        dialect: org.hibernate.dialect.PostgreSQLDialect