failed to lazily initialize a collection of role 的问题

最近遇到这样的问题 failed to lazily initialize a collection of role

代码如下

	//多对多定义
	@ManyToMany
	@JoinTable( name = "acct_user_group", joinColumns = { @JoinColumn(name = "user_id") }, inverseJoinColumns = { @JoinColumn(name = "group_id") })
	//Fecth策略定义
	@Fetch(FetchMode.SUBSELECT)
	//集合按id排序.
	@OrderBy("id")
	//集合中对象id的缓存.
	@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
	public List<Group> getGroupList() {
		return groupList;
	}

 

网上查了很多文章，都说是因为懒加载的问题。所以改成

	//多对多定义
	@ManyToMany(fetch=FetchType.EAGER)
	@JoinTable( name = "acct_user_group", joinColumns = { @JoinColumn(name = "user_id") }, inverseJoinColumns = { @JoinColumn(name = "group_id") })
	//Fecth策略定义
	@Fetch(FetchMode.SUBSELECT)
	//集合按id排序.
	@OrderBy("id")
	//集合中对象id的缓存.
	@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
	public List<Group> getGroupList() {
		return groupList;
	}

 问题还是没有解决，最后吧@Fetch(FetchMode.SUBSELECT)注释掉就解决了问题

	//多对多定义
	@ManyToMany(fetch=FetchType.EAGER)
	@JoinTable( name = "acct_user_group", joinColumns = { @JoinColumn(name = "user_id") }, inverseJoinColumns = { @JoinColumn(name = "group_id") })
	//Fecth策略定义
	//@Fetch(FetchMode.SUBSELECT)
	//集合按id排序.
	@OrderBy("id")
	//集合中对象id的缓存.
	@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
	public List<Group> getGroupList() {
		return groupList;
	}