[SpringBoot][Kotlin] org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing 에러

실전! 스프링 부트와 JPA 활용1 - 웹 애플리케이션 개발 강의를 들으면 주문서비스 테스트를 작성하고, 실행했는데 에러를 만났다. 반가워~👋

 

에러메세지

org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : com.jpabook.jpashop.domain.Order.delivery -> com.jpabook.jpashop.domain.Delivery; nested exception is java.lang.IllegalStateException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing : com.jpabook.jpashop.domain.Order.delivery -> com.jpabook.jpashop.domain.Delivery

• object references an unsaved transient instance
• save the transient instance before flushing

이 두 문장이 가장 눈에 들어온다. 저장되지 않은 인스턴스를 참조하려했으니, 플러싱 하기전에 저장해라~ 이런 느낌인듯 하다.

 

OrderService

@Service
@Transactional(readOnly = true)
class OrderService(
    private val orderRepository: OrderRepository,
    private val memberRepository: MemberRepository,
    private val itemRepository: ItemRepository
) {
    /**
     * 주문
     */
    @Transactional
    fun order(memberId: Long, itemId: Long, count: Int): Long? {
        // 엔티티 조회
        val member = memberRepository.findOneById(memberId)
        val item = itemRepository.findOneById(itemId)

        // 배송정보 생성
        val delivery = Delivery(member!!.address!!, null, DeliveryStatus.READY) // TODO: !! 제거

        // 주문 상품 생성
        val orderItem =
            OrderItem().createOrderItem(item!!, item.price, count) // TODO: simplify

        // 주문 생성
        val order = Order(LocalDateTime.now(), OrderStatus.ORDER).createOrder(member, delivery, orderItem)

        // 주문 저장
        orderRepository.save(order)

        return order.id
    }
	...
}

 

Service클래스의 주문 함수를 보면 Delivery, OrderItem엔티티도 생성하지만, Order엔티티만 DB에 저장을 하고있다.

JPA에 의해 Order와 연관된 Delivery, OrderItem도 Order를 저장하면 같이 저장된다고 강의에서 들었지만, 뭔가 이 부분에서 걸린 듯 보인다.

 

Order

package com.jpabook.jpashop.domain

import java.time.LocalDateTime
import javax.persistence.*

@Entity
@Table(name = "orders")
class Order(orderDate: LocalDateTime, status: OrderStatus) {

    @Id
    @GeneratedValue
    @Column(name = "order_id")
    var id: Long? = null

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "member_id")
    var member: Member? = null

    @OneToMany(mappedBy = "order")
    var orderItems: MutableList<OrderItem> = ArrayList()

    @OneToOne
    @JoinColumn(name = "delivery_id")
    var delivery: Delivery? = null

    var orderDate: LocalDateTime = orderDate

    @Enumerated(EnumType.STRING)
    var status: OrderStatus = status // Order, Cancel

    //== 메서드 ==//
    ...

}

Order엔티티 저장시 함께 저장되어야 하는 delivery, orderItem에 Cascade 옵션이 있어야하는데 없다...!! 😅

 

해결방법

delivery, orderItem에 Cascade 옵션을 달아주면 해결~😉

 

@Entity
@Table(name = "orders")
class Order(orderDate: LocalDateTime, status: OrderStatus) {

    @Id
    @GeneratedValue
    @Column(name = "order_id")
    var id: Long? = null

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "member_id")
    var member: Member? = null

    @OneToMany(mappedBy = "order", cascade = [CascadeType.ALL])
    var orderItems: MutableList<OrderItem> = ArrayList()

    @OneToOne(cascade = [CascadeType.ALL], fetch = FetchType.LAZY)
    @JoinColumn(name = "delivery_id")
    var delivery: Delivery? = null

    var orderDate: LocalDateTime = orderDate

    @Enumerated(EnumType.STRING)
    var status: OrderStatus = status // Order, Cancel

    //== 메서드 ==//
    ...
}

 

전체코드

GitHub - suyeoniii/springboot-jpa-practice