OneToMany 端的 JoinColumn 不起作用

Question

为什么我不能在OneToMany 端创建@JoinColumn？它抛出：

2017-05-17 09:13:34.063  WARN 7724 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Bean creation exception on non-lazy FactoryBean type check: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'roleMapper' defined in file [C:\MyProjects\myjnia\Myjnia_Inzynier\target\classes\com\carwash\mappers\RoleMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in com.carwash.MyjniaInzynierApplication: BeanPostProcessor before instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration': Initialization of bean failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'org.springframework.context.annotation.ConfigurationClassPostProcessor.importRegistry' available

    . //always the same but with every mapper interface
    .
    .

当我改变方向时 - 将JoinColumn 放在Wash 一侧，它可以工作，但我想从Admin 表中引用Wash。

Admin类：

 public class Admin {
        private Integer adminId;
        private User userId;
        private List<Wash> washId;

        @OneToMany(mappedBy = "washAdmin", fetch = FetchType.LAZY)
        @JoinColumn(name = "washId")
        public List<Wash> getWashId() {
            return washId;
        }

Wash类：

public class Wash {
    private Integer washId;
    private String name;
    private WashLocation washLocation;
    private List<Worker> washWorker;
    private List<Reservation> washReservation;
    private List<WashWashType> washTypes;
    private Admin washAdmin;

    @ManyToOne()
    @JsonIgnore
    public Admin getWashAdmin() {
        return washAdmin;
    }

    public void setWashAdmin(Admin washAdmin) {
        this.washAdmin = washAdmin;
    }

Answer 1

在这种情况下，您需要使您的关系成为双向的，您有两个选择，或者您有单向关系并且 joinColumn 将在拥有实体中，或者您将拥有单向。

查看这个例子如何创建单向关系

http://www.codesenior.com/en/tutorial/Hibernate-Unidirectional-OneToMany-and-ManyToOne-Concepts

JoinColumn 应该在 owningentity 中（在你的情况下没有集合的那个），并且 mappedby 应该在 none owningentity 中