java ----> 类转换异常

com.rr.domain.Department_$$_javassist_5 cannot be cast to javassist.util.proxy.Proxy

两个原因:

1、懒加载

在web.xml配置opensessioninviewfilter，须在struts2的strutsprepareandexecutefilter之前配置

     <filter>
         <filter-name>OpenSessionInViewFilter</filter-name>
         <filter-class>org.springframework.orm.hibernate4.support.OpenSessionInViewFilter</filter-class>
     </filter>
     <filter-mapping>
         <filter-name>OpenSessionInViewFilter</filter-name>
         <url-pattern>*.action</url-pattern>
     </filter-mapping>

2、包冲突

javasisst 两个版本共存了，一个是hibernate的，一个是sturts2的删除低版本。

maven工程的话排除低版本的

         <!-- struts2 -->
         <dependency>
             <groupId>org.apache.struts</groupId>
             <artifactId>struts2-core</artifactId>
             <version>${struts.version}</version>
             <exclusions>
                 <exclusion>
                     <artifactId>javassist</artifactId>
                     <groupId>javassist</groupId>
                 </exclusion>
             </exclusions>
         </dependency>

javassist简介

* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.