Struts2 错误：There is no result type defined for type 'json' mapped with name 'success'.

错误描述：

Caused by: There is no result type defined for type 'json' mapped with name 'success'. Did you mean 'json'? - result - file:/D:/Workspaces/MyEclipse%208.5/oam/target/classes/performance.xml:23:25
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.buildResults(XmlConfigurationProvider.java:621)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addAction(XmlConfigurationProvider.java:365)
... 26 more

然后查看， performance.xml的是否正确，源码如下

<package name="performance" namespace="/performance" extends="struts-default">

<action name="accountpage" class = "com.dice.voip.web.oam.base.BaseAction">

<result>/performance/systemaccount.jsp</result>

</action>

<action name="accountinfos" class="com.dice.voip.web.oam.actions.SysInfoAccountAction">

<result type="json"></result>

</action>

</package>

</struts>

图中明示的问题为struts-default，因为在struts.xml文件中已经定义了包default，并且在该包中定义了json这一结果，因此package performance的扩展包必须是default，修改后问题解决

分析出错原因：

对Struts2的配置文件不了解