SSH级联删除出错--在线等，着急！！！！！

两个实体：
--------------1---------------
@Entity
@Table(name="bbstask")
public class Task {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name="Task_id")
private int taskId; //帖子ID

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
@JoinColumn(name="Task_id")
private Set<Tender> tender =new HashSet<Tender>();//帖子的回复（一个帖子有很多回复）其余略
-------------2---------------------
@Entity
@Table(name="bbstender")
public class Tender {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name="Tender_id")
private int tenderId;//回复id

@ManyToOne
@JoinColumn(name="Task_id")
private Task task;//每个回复对应一个帖子的
----------dao---------
@Override
public boolean deleteTask(int taskId) {
    Task task = this.getHibernateTemplate().get(Task.class, taskId);//立即加载帖子

--------------异常----------------
Servlet.service() for servlet springmvc threw exception
org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from associations）
    this.getHibernateTemplate().delete(task);//删除
     return true;
} --------------------编程问答-------------------- ----------dao---------
@Override
public boolean deleteTask(int taskId) {
     Task task = this.getHibernateTemplate().get(Task.class, taskId);//立即加载帖子
      this.getHibernateTemplate().delete(task);//删除
      return true;
}

--------------异常----------------
  Servlet.service() for servlet springmvc threw exception
org.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from associations）
--------------------编程问答-------------------- 最上面dao  和异常写乱了  看1楼谢谢 --------------------编程问答-------------------- 不知道为什么不能级联删除，那如果删除task前先手动把task内的tenders都清除呢

补充：Java ,  Java EE