我可以覆盖生成的id吗?

@Entity
@Table(name="TERMS")
public class Term implements Serializable {
    @Id
    @GenericGenerator(name = "generator", strategy = "guid", parameters = {})
    @GeneratedValue(generator = "generator")
    @Column(name="TERM_ID")
    private String termId;
}

但是,当我的实体有现有的IDS让Hibernate非常恼火时,做一个持久化。那么,这实际上是可能的,还是最好避免删除它们,而只是尝试合并呢?

org.hibernate.PersistentObjectException: detached entity passed to persist: com.idbs.omics.catalog.entity.Term

谢谢