Unable to instantiate Action, xxxAction, defined for ‘xxx’ in namespace ‘/’xxxAction解决方案
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出现这个问题的原因主要有两个
1、如果项目没有使用Spring，则struts.xml配置文件中，这个action的class属性的路径没有写完整，应该是包名.类名
2、如果项目使用了Spring，那就是applicationContext.xml里面没有为这个action定义bean。这样strus.xml中的对应action的class属性的值就是Spring配置文件中bean的id，比如：
applicationContext.xml
<bean id="adminAction" class="go.derek.action.AdminAction"scope="prototype"></bean>
struts.xml
<action name="admin" class="adminAction" method="execute"><result>/admin.jsp</result></action>
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