org.hibernate.LazyInitalizationException

错误信息：org.hibernate.LazyInitalizationException…, no session or session was closed

分析：

当统计子分类个数时，entity对象已经处于session之外的游离状态，Hibernate的transaction默认lazy=”true”，所以，程序在取数据时会出现错误

解决：

在web.xml文件中设置Filter

<!-- To Solve an org.hibernate.LazyInitalizationException -->
	<filter>
		<filter-name>Spring penEntityManagerInViewFilter</filter-name>
		<!-- Include this if you are using Hibernate -->
		<!-- org.springframework.orm.hibernate3.support.OpenSessionInViewFilter 用于hibernate+spring -->		
	<filter-class>org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>SpringOpenEntityManagerInViewFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>