spring+struts2整合，做了一个用户登陆的测试程序，附下配置文件片段
<constant name="struts.objectFactory" value="spring"/>
<package name="struts-config" namespace="/" extends="struts-default">
<action name="login" class="loginAction">
<result name="frame">/frame.jsp </result>
</action>
</package>
</struts>
但提交表单后报的如下500错误，如果直接写class="com.system.actionLoginAction"可以执行
Unable to instantiate Action, loginAction, defined for ‘login‘ in namespace ‘/‘loginAction
com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:306)
com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:387)
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:186)
org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:47)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:458)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:76)
从错误看是spring没能给struts2创建出action，可能出现的原因：
1.没有加载struts2-spring-plugin-2.1.8.1.jar
2.包冲突，删除asm.jar（网上说的）
3.struts或spring 配置文件错误（可以看我写的“struts2+spring整合框架 ”）
4.spring配置文件名错误，spring配置文件默认是applicationContext.xml,在web.xml中可能会配成
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext-*.xml,classpath*:applicationContext-*.xml</param-value>
</context-param>