最近我將我的項目從 Hibernate 版本 3.1 遷移到 4.3，為了獲得更好的性能，我嘗試使用注釋而不是我的 xml 映射。我在繼承類的所有實體類中都有以下異常。錯誤是“ org.休眠。MappingException“我試圖將 targetEntity 添加到 manytoOne 類并添加 @Access(AccessType.PROPERTY) 沒有任何效果。更改為字段注釋是不可能的，因為我有 150 多個實體類。我試圖刪除擴展類，它的@override 方法和異常不存在，但是，我需要添加使用它。這是我的實體類    @Entity    @Table(name = "mapusergroups", catalog = "designdb")    public class Mapusergroups extends PlanroomMigrationEntity implements     java.io.Serializable {private int idMapUserGroups;private Groups groups;private Users users;public Mapusergroups() {}public Mapusergroups(Groups groups, Users users) {    this.groups = groups;    this.users = users;}@Id@GeneratedValue(strategy = IDENTITY)@Column(name = "idMapUserGroups", unique = true, nullable = false)public int getIdMapUserGroups() {    return this.idMapUserGroups;}public String getIdMapUserGroupsString() {    return "" + this.idMapUserGroups;}public void setIdMapUserGroups(int idMapUserGroups) {    this.idMapUserGroups = idMapUserGroups;}@ManyToOne(fetch = FetchType.LAZY, targetEntity = Groups.class)@JoinColumn(name = "FK_idGroups", nullable = false)@PlanroomMigrationEntity.PathUpToCompanypublic Groups getGroups() {    return this.groups;}public void setGroups(Groups groups) {    this.groups = groups;}@ManyToOne(fetch = FetchType.LAZY, targetEntity = Users.class)@JoinColumn(name = "FK_idUsers", nullable = false)@PlanroomMigrationEntity.ReferenceToUserpublic Users getUsers() {    return this.users;}public void setUsers(Users users) {    this.users = users;}@Overridepublic BaseWrapper<?> getWrapper() {    return new WMapUserGroups(this);}@Overridepublic PlanroomMigrationDAO getDao() {    return new MapUserGroupsDAO();}