ネームスペース/とアクション名 “yourActionName”に対してマッピングされたアクションはありません

HTTP Status 404 -
There is no Action mapped for namespace/and action name "yourActionName".

type Status report

message There is no Action mapped for namespace/and action name "yourActionName".

description The requested resource
(There is no Action mapped for namespace/and action name "yourActionName".) is not available.

<constant name="struts.devMode" value="true"/>

Struts Problem Report

Struts has detected an unhandled exception:

Messages:
There is no Action mapped for namespace/and action name "yourActionName".
Stacktraces

There is no Action mapped for namespace/and action name "yourActionName". -[unknown location]    com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:178)
    org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61)
   ...

You are seeing this page because development mode is enabled. Development mode, or devMode,
enables extra debugging behaviors and reports to assist developers. To disable this mode, set:

  struts.devMode=false
in your WEB-INF/classes/struts.properties file.

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
    <constant name="struts.devMode" value="true"/>
    <package name="default" namespace="/" extends="struts-default">

        <action name="abcAction"
            class="com.mkyong.common.action.AbcAction" >
            <result name="success">pages/abc.jsp</result>
        </action>

    </package>
</struts>