struts2+spring Unable to instantiate Action

错误代码：HTTP Status 500 - Unable to instantiate Action, myIndexAction1, defined for 'Index' in namespace '/'Cannot find class [action.IndexAction] for bean with name 'myIndexAction1' defined in ServletContext resource [/WEB-INF/applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: action.IndexAction

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type Exception report

message Unable to instantiate Action, myIndexAction1, defined for 'Index' in namespace '/'Cannot find class [action.IndexAction] for bean with name 'myIndexAction1' defined in ServletContext resource [/WEB-INF/applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: action.IndexAction

description The server encountered an internal error that prevented it from fulfilling this request.

exception

Unable to instantiate Action, myIndexAction1,  defined for 'Index' in namespace '/'Cannot find class [action.IndexAction] for bean with name 'myIndexAction1' defined in ServletContext resource [/WEB-INF/applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: action.IndexAction - action - file:/G:/SoftWare/apache-tomcat-7.0.63-windows-x64/apache-tomcat-7.0.63/webapps/ssh_demo/WEB-INF/classes/struts.xml:10:72com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:317)com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:398)com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:194).....

root cause

org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [action.IndexAction] for bean with name 'myIndexAction1' defined in ServletContext resource [/WEB-INF/applicationContext.xml]; nested exception is java.lang.ClassNotFoundException: action.IndexActionorg.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1357)......

root cause

java.lang.ClassNotFoundException: action.IndexActionorg.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1722)org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1573)org.springframework.util.ClassUtils.forName(ClassUtils.java:250)org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:394)org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1402)......

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.63 logs.

1.首先要看看自己的配置是否正确：这里有一个帖子可以简单看一下 http://www.cnblogs.com/S-E-P/archive/2012/01/18/2325253.html 如果是配置问题那么更改之后就能正常访问。在配置完全正确，jar包没有缺少的情况下。看下文。

2.我遇到的问题是，配置完全正确，偶尔也能正常加载，但是大部分时候就报错（如上文所示）搞了很久之后开始想，不能加载类。这个类存在吗？于是便去tomcat的该项目目录的classes目录下查看，发现并没有class文件，看到这里，又想到，可能是没有编译成功，于是更项目的jre ，javacomplier版本，tomcat 的jdk为同一版本，这才正常运行。

3.之前也遇到过，但是不知道如何解决，这次随着时间的积累，有自己的推理，知道了为什么。很激励自己，加油！