struts json 类型异常返回到js弹框问题解决办法

<package name="sysCnn" namespace="/" extends="json-default">     <global-results>       <result name="error">/WEB-INF/pages/error.jsp</result>       <result name="over">/js/over.js</result>     </global-results>          <global-exception-mappings>       <exception-mapping result="error" exception="java.lang.Exception" />       <exception-mapping result="over" exception="com.xxx.exception.OverException" />     </global-exception-mappings>     <action name="ConnONGL_*" class="com.xxx.action.LoginAction" method="{1}">       <result name="success" type="json" >           <param name="root">jsonMap</param>       </result>   </action>  

$.ajax({     url:$.contextPath+"/ConnONGL_login",     //dataType:"Json",  这行注释掉     async:false,     cache:false,     data:{