在entity中的@OneToMany、@OneToOne等中设置fetch = FetchType.LAZY时，在Struts2的Action中进行相关操作出现错误信息如下
org.hibernate.LazyInitializationException: could not initialize proxy no session
解决方法：
在web.xml中加入
<filter>
<filter-name>SpringOpenEntityManagerInViewFilter</filter-name>
<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SpringOpenEntityManagerInViewFilter</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
更多其它时刻解决延迟加载错误的方法参见
http://www.javaeye.com/topic/129698