Hibernate 多对一映射中的 EntityNotFoundException 但是数据存在

Question

当我尝试通过 Invoice 对象获取用户时出现 javax.persistence.EntityNotFoundException 错误

invoice.getUser().getId()

错误如下

javax.persistence.EntityNotFoundException: Unable to find com.indianretailshop.domain.User with id 5
    at org.hibernate.ejb.Ejb3Configuration$Ejb3EntityNotFoundDelegate.handleEntityNotFound(Ejb3Configuration.java:137)
    at org.hibernate.proxy.AbstractLazyInitializer.checkTargetState(AbstractLazyInitializer.java:189)
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:178)
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:215)

实体类如下（不包括getters和setters）

 @Entity
@Table(name="users")
public class User implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(unique=true, nullable=false)
    private int id;

    .
        .
        .

    //bi-directional many-to-one association to Invoice
    @OneToMany(mappedBy="user")
    private List<Invoice> invoices;
}

@Entity
@Table(name="invoice")
public class Invoice implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    @Column(unique=true, nullable=false)
    private int id;
        .
        .
        .

    //bi-directional many-to-one association to User
    @ManyToOne(fetch=FetchType.LAZY)
    @JoinColumn(name="Users_id")
    private User user;
}

原文由 Badal Singh 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

问题可能是直接实体不存在，但也可能是来自该实体的引用实体，通常用于 EAGER 获取类型，或者 optional=false。

尝试这个：

      //bi-directional many-to-one association to User
     @ManyToOne(fetch=FetchType.LAZY)
     @JoinColumn(name="Users_id")
     private User user = new User();

原文由 rajesh kakawat 发布，翻译遵循 CC BY-SA 3.0 许可协议

Answer 2

我有同样的问题，并且

@NotFound(action = NotFoundAction.IGNORE)

解决了我的问题。

原文由 ozeray 发布，翻译遵循 CC BY-SA 3.0 许可协议