hibernate延迟加载错误：failed to lazily initialize a collection of role

hibernate延迟加载异常：failed to lazily initialize a collection of role
这个问题一般出现在一对多的情况下，解决的方法有两种
1、设置lazy=false
如果是用annotation，则配置如下
@OneToMany(
   targetEntity = CourseAuthorizationItem.class,
   cascade = {CascadeType.PERSIST, CascadeType.MERGE},
   mappedBy = "course", fetch=FetchType.EAGER
  )
将fetch类型设置成直接获取

2、就是使用filter，过滤所有的链接
如果在使用filter的时候，要配置事务处理，否则会导致session处于只读状态而不能做修改、删除的动作

<web-app>

<filter>
<filter-name>hibernateFilter</filter-name>
<filter-class>
org.springframework.orm.hibernate.support.OpenSessionInViewFilter
</filter-class>
</filter>

<filter-mapping>
<filter-name>hibernateFilter</filter-name>
<url-pattern>*.do</url-pattern>
</filter-mapping>

</web-app>


failed to lazily initialize a collection of role: XXXXXX, no session or session was closed