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原因:java.lang.IllegalArgumentException:不是托管类型:&原因:org.hibernate.AnnotationException:未为实体指定标识符:

[英]Caused by: java.lang.IllegalArgumentException: Not a managed type: & Caused by: org.hibernate.AnnotationException: No identifier specified for entity:

我创建了两个实体类。

RoleEntity:

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table (name ="roles")
public class RoleEntity {

@Id
@Column(name = "role_id")
private Integer roleId;
@Column(name = "role_name")
private String roleName;
//Getters
//Setters

UserEntity:

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="user_master")
public class UserEntity {

@Id
private Integer id;
@Column(name = "user_name")
private String username;
@Column(name = "user_password")
private String password;
//getters
//setters

现在,我有一个简单的pojo,它将从这两个实体中获取数据,稍后将在服务中使用。

import java.util.Set;

public class UserRoleAssociationEntity {

UserEntity user;
Set<RoleEntity> roles;
//getters
//setters

现在,在运行项目时出现错误。

Caused by: java.lang.IllegalArgumentException: Not a managed type: class com.dataGuru.BusDirV3.Entities.UserRoleAssociationEntity

如果我使用@entity注释UserRoleAssociationEntity类,则会出现以下错误:

Caused by: org.hibernate.AnnotationException: No identifier specified for entity: com.dataGuru.BusDirV3.Entities.UserRoleAssociationEntity

我在这里面临的问题是什么?

您需要在类中具有一个唯一字段,该字段充当此实体的标识符。 (带有@Id注释的字段)

无需创建新的POJO,而是在UserEntity类中添加多对多关系。

 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.Id;
 import javax.persistence.Table;

 @Entity
 @Table(name="user_master")
 public class UserEntity 
{
 @Id
 private Integer id;
 @Column(name = "user_name")
 private String username;
 @Column(name = "user_password")
 private String password;
 @Column(name = "user_password")
 private String password;

 @ManyToMany(cascade=CascadeType.MERGE, fetch = FetchType.EAGER) //
 @JoinTable(
        name="USERROLE_ASSOCIATION",
        joinColumns={@JoinColumn(name="USER_ID", referencedColumnName="ID")},
        inverseJoinColumns={@JoinColumn(name="ROLE_ID", referencedColumnName="ID")})
private Set<RoleEntity> UserRoleAssociationEntity ;

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