Struts 2 set default action

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Java

struts

Hi everyone.
i am working on java web application with struts2 framework. in this application, i have a login action that i expect to be the default action of my application. in other words, i expect that when i run application, login action execute and my url be like this:

http://localhost:8080/MyWebApplication/login

so i need to set default action in my project. but i don't know... :(
the part of my struts.xml file is like this:

<package name="login" namespace="/" extends="struts-default">
        <action name="login" class="Action.loginAction">
            <result name="success" type="redirectAction">
                <param name="actionName">search</param>
                <param name="namespace">/</param>
            </result>
            <result name="error">/login.jsp</result>
            <result name="input">/login.jsp</result>
        </action>
    </package>

i tried

<default-action-ref name="login" />

in my login package, but doesn't any effect.
could anyone help me to solve my problem?
thanks in advance.