Not-null属性引用瞬态值 - 必须在当前操作之前保存瞬态实例

Question

我有2个域模型和一个Spring REST控制器,如下所示:

@Entity
public class Customer{

@Id
private Long id;

@OneToOne(fetch = FetchType.EAGER)
@JoinColumn(name="COUNTRY_ID", nullable=false)
private Country country;

// other stuff with getters/setters

}

@Entity
public class Country{

@Id
@Column(name="COUNTRY_ID")
private Integer id;

// other stuff with getters/setters

}

Spring REST控制器:

@Controller
@RequestMapping("/shop/services/customers")
public class CustomerRESTController {

   /**
    * Create new customer
    */
    @RequestMapping( method=RequestMethod.POST)
    @ResponseStatus(HttpStatus.CREATED)
    @ResponseBody
    public com.salesmanager.web.entity.customer.Customer createCustomer(@Valid @RequestBody   Customer customer, Model model, HttpServletRequest request, HttpServletResponse response) throws Exception {

        customerService.saveOrUpdate(customer);

        return customer;
    }

    // other stuff
}

我试图用以下JSON作为主体调用上面的REST服务:

{
    "firstname": "Tapas",
    "lastname": "Jena",
    "city": "Hyderabad",
    "country": "1"
}

国家代码1已存在于国家/地区表中的位置.问题是当我调用此服务时出现以下错误:

org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.TransientPropertyValueException: Not-null property references a transient value - transient instance must be saved before current operation: com.test.model.Customer.country -> com.test.model.Country; nested exception is java.lang.IllegalStateException: org.hibernate.TransientPropertyValueException: Not-null property references a transient value - transient instance must be saved before current operation: com.test.model.Customer.country -> com.test.model.Country

任何帮助将不胜感激!

Answer 1

尝试使用CascadeType.ALL

@OneToOne(fetch = FetchType.EAGER,cascade=CascadeType.ALL)
@JoinColumn(name="COUNTRY_ID", nullable=false) 

private Country country;

Answer 2

我遇到了类似的问题.两个实体:文档和状态. 文件过关系OneToMany与地位,那代表的历史地位的文件了.

因此,有一个文件内部状态的@NotNull @ManyToOne参考.

另外,我需要知道实际情况的文件.所以,我需要另一种关系,这次@OneToOne也是@NotNull在Document中.

问题是:如果两个实体都@NotNull引用另一个实体,我怎么能第一次坚持这两个实体呢？

解决方案是:@NotNull从actualStatus参考中删除参考.这样,它就能够持久化两个实体.