java - 当我需要使用两列时如何使用@oneToMany

Question

这个问题已经有答案了:

Hibernate : org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags (1 个回答)

已关闭 3 年前。

当我尝试做类似的事情时，我无法成功解决这个问题:

    @OneToMany(mappedBy = "company", fetch = FetchType.EAGER)
private List<Coupon> coupons;
@OneToMany(mappedBy = "company", fetch = FetchType.EAGER)
private List<Employee> employes;

我不断收到此错误消息:

WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'companyDBDAO': Unsatisfied dependency expressed through field 'getlocalSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'getLocalSessionFactory' defined in config.SpringConfig: Invocation of init method failed; nested exception is org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags: [beans.Company.coupons, beans.Company.employes]

我对此很陌生，只有删除其中一个才能起作用..

Answer 1

删除 fetchType = FetchType.EAGER 并将 @LazyCollection(LazyCollectionOption.FALSE) 放置在两个集合上。