PropertyAccessException:访问字段时出错
我有一个实体 :
@Entitypublic class User implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "id", unique = true, nullable = false)
private Long id;
public Long getId() {
return id;
}
...}
我正在尝试使用以下命令从数据库中删除用户:
@Modifying@Query("DELETE FROM Collaborator c WHERE c.user = :userId AND c.task = :taskId")
void deleteUserFromTask(@Param("userId") Long userId, @Param("taskId") Long taskId);
这是用户和协作者(我要从中删除的表)之间的关系:在
@JsonIgnore@OneToMany(mappedBy="user", fetch = FetchType.EAGER)
private Set<Collaborator> collaborators = new HashSet<>();
在
@ManyToOne(cascade = {CascadeType.MERGE, CascadeType.DETACH,
CascadeType.REFRESH },
fetch = FetchType.EAGER)
@JoinColumn(name = "UserID", nullable = true)
private User user;
但我收到此错误:
Caused by: org.hibernate.property.access.spi.PropertyAccessException: Error accessing field [private java.lang.Long gestionprojet.java.entities.beans.User.id] by reflection for persistent property [gestionprojet.java.entities.beans.User#id] : 1
hibernate版本:5.2.6.FINAL
回答:
您的参数不匹配,即您尝试为用户类型指定Long作为参数:
您可以通过以下两种方式之一对其进行更改:
@Query("DELETE FROM Collaborator c WHERE c.user.id = :userId AND c.task.id = :taskId")void deleteUserFromTask(@Param("userId") Long userId, @Param("taskId") Long taskId);
要么
@Query("DELETE FROM Collaborator c WHERE c.user = :user AND c.task = :task")void deleteUserFromTask(@Param("user") User user, @Param("task") Task task);
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