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
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: