解决org.hibernate.LazyInitializationException: could not initialize proxy

问题描写叙述：

Struts Problem Report

Struts has detected an unhandled exception:

Messages:	could not initialize proxy - no Session Error reading 'name' on type future.oa.domain.Department_$$_jvstb8a_0 javax.el.ELException: Error reading 'name' on type future.oa.domain.Department_$$_jvstb8a_0
File:	org/hibernate/proxy/AbstractLazyInitializer.java

Stacktraces

org.apache.jasper.JasperException: javax.el.ELException: Error reading 'name' on type future.oa.domain.Department_$$_jvstb8a_0

    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)

    .......

javax.el.ELException: Error reading 'name' on type future.oa.domain.Department_$$_jvstb8a_0

    javax.el.BeanELResolver.getValue(BeanELResolver.java:110)
    org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:104)
    org.apache.el.parser.AstValue.getValue(AstValue.java:183)
    org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)

    ......

org.hibernate.LazyInitializationException: could not initialize proxy - no Session

    org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:164)
    org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:285)
    org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185)
    future.oa.domain.Department_$$_jvstb8a_0.getName(Department_$$_jvstb8a_0.java)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    ......

You are seeing this page because development mode is enabled. Development mode, or devMode, enables extra debugging behaviors and reports to assist developers. To disable this mode, set:

  struts.devMode=false

in your WEB-INF/classes/struts.properties file.

解决方法：

解决懒载入问题。

方法一:（直接将懒载入关闭）：

在 .hbm.xml 里

<!--  lazy="false"关闭懒载入 -->

<set name="children" cascade="delete" lazy="false">   
<key column="parentId"></key>
<one-to-many class="Department"/>
</set>

缺点：一些懒载入的长处也用不了了。

方法二:

在 web.xml里（注：要在 <!-- 配置struts2核心的过滤器 --> 之前）

  <!-- 配置Spring的用于解决懒载入问题的过滤器 -->
  <filter>
  <filter-name>OpenSessionInViewFilter</filter-name>
  <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
  </filter>
  <filter-mapping>
  <filter-name>OpenSessionInViewFilter</filter-name>
  <url-pattern>*.action</url-pattern>
  </filter-mapping>

  然后在 *.hbm.xml里 再打开懒载入。