关于 struts2 Unable to load configuration.

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<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"><struts><package name="student" namespace="/student" extends="struts-default,json-default"><action name="student_*" class="cn.edu.nwsuaf.action.StudentAction"method="{1}"><result name="init">/pages/student/student-edit.jsp</result><result name="update">/pages/student/student-list.jsp</result><result name="find">/pages/student/student-list.jsp</result><result name="delete">/pages/student/student-list.jsp</result><result name="add" type="json"><param name="root">studentAdd</param></result></action></package></struts>

因为没有继承json-default，导致再加入result type="json"属性时，启动tomcat控制台报错：Exception starting filter struts2 Unable to load configuration. - action

解决方法：

package extends要继承json-default

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