当我尝试插入通知类型对象时,子实体也尝试插入

我有一个notificationTypes表,权限表。这些通过桥接表notification\u types\u权限进行链接。 当所有实体都是新的时,它可以正常工作。 我的问题是,当我尝试使用现有权限插入新的notificationTypes时,time权限也会尝试插入一个新的notificationTypes。 我的表格和实体结构如下所示。

 CREATE TABLE `notification_types` (
  `Id` BIGINT(16) NOT NULL AUTO_INCREMENT,
  `TypeName` VARCHAR(80) NOT NULL,
  `InsertedDttm` DATETIME NULL,
  `InsertedBy` BIGINT(16) NULL,
  `UpdatedDttm` DATETIME NULL,
  `UpdatedBy` BIGINT(16) NULL,
  PRIMARY KEY (`Id`));

CREATE TABLE `notification_types_permission` (
  `Id` BIGINT(16) NOT NULL AUTO_INCREMENT,
    `NotificationTypes_ID` BIGINT(16) NOT NULL,
    `permissions_ID` int(11) NOT NULL,
  PRIMARY KEY (`Id`), FOREIGN KEY (NotificationTypes_ID)
        REFERENCES `frontoffice`.notification_types(id), FOREIGN KEY (permission_Id)
        REFERENCES `frontoffice`.`permission`(id));
public class NotificationTypes {

    @Id 
    private Long id;
    private String typeName;
    @Temporal(TemporalType.TIMESTAMP)
    private Date insertedDttm;
    private Long insertedBy;
    @Temporal(TemporalType.TIMESTAMP)
    private Date updatedDttm;
    private Long updatedBy;

    @OneToMany(cascade = CascadeType.PERSIST, fetch = FetchType.EAGER)
    private List<RLPermissions> permissions;
}