Hibernate出错 - could not initialize proxy - the owning Session was closed

2007-08-08 14:04:07,640 ERROR [org.hibernate.LazyInitializationException] - <could not initialize proxy - the owning Session was closed>
org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed
 at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:60)
 at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
 at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:172)
 at com.systex.meeting.springhibernate.po.MmsPersonInfo$$EnhancerByCGLIB$$9a771970.getChineseName(<generated>)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.apache.commons.beanutils.PropertyUtilsBean.invokeMethod(PropertyUtilsBean.java:1773)
 at org.apache.commons.beanutils.PropertyUtilsBean.getSimpleProperty(PropertyUtilsBean.java:1132)
 at org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:686)
 at org.apache.commons.beanutils.PropertyUtilsBean.getProperty(PropertyUtilsBean.java:715)
 at org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:290)
 at org.apache.struts.taglib.TagUtils.lookup(TagUtils.java:950)
 at org.apache.struts.taglib.bean.WriteTag.doStartTag(WriteTag.java:225)
 at org.apache.jsp.WEB_002dINF.jsp.meetRoomList.meetRoomList_jsp._jspx_meth_bean_write_3(meetRoomList_jsp.java:1476)
 at org.apache.jsp.WEB_002dINF.jsp.meetRoomList.meetRoomList_jsp._jspService(meetRoomList_jsp.java:727)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
 at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)

 我在页面上写<bean:write name="roomInfo" property="mmsPersonInfo.chineseName"/>的时候所报的错误。

分析原因：
由于Spring控制的Hibernate的生命周期只针对数据层和服务层，而未管理到表现层，所以会出现the owning Session was closed的现象。针对这一点，我通过hibernate filter的方式来解决。

解决方法：
在web.xml中配置filter来解决。

 <!--  hibernate session filter  --> 
  < filter > 
   < filter-name > hibernateFilter </ filter-name > 
   < filter-class >    org.springframework.orm.hibernate3.support.OpenSessionInViewFilter
   </ filter-class > 
  </ filter > 
 
 < filter-mapping > 
   < filter-name > hibernateFilter </ filter-name > 
   < url-pattern > *.do </ url-pattern > 
  </ filter-mapping >

我们的系统架构是struts+spring+hibernate，struts跟spring的整合是在struts-config.xml里加了个plugin：

<plug-in
        className="org.springframework.web.struts.ContextLoaderPlugIn">
        <set-property property="contextConfigLocation"
        value="classpath*:spring/**/*.xml" />
        </plug-in>

在web.xml中配置hibernateFilter 后，还需要在struts-config.xml里把plugin去掉，在web.xml里加上如下代码：

<!--Spring ApplicationContext-->
    <context-param>

       <param-name>contextConfigLocation</param-name>

       <param-value>classpath*:spring/**/*.xml</param-value>

    </context-param>
    
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>