Struts 2在Google App Engine中使用点传递参数

Question

我可以在Struts 2（GAE app）Url中传递参数，如下所示：

http://localhost:8888/user/jr
http://localhost:8888/user/jr@jrgalia

但是我的错误

http://localhost:8888/user/jr@jrgalia.com

如何允许以点字符传递参数？

下面是struts.xml

....
<constant name="struts.enable.SlashesInActionNames" value="true"/>
<constant name="struts.mapper.alwaysSelectFullNamespace" value="false"/>
...
<action name="/user/*" class="LinkAction" method="usersLink">
<param name="userName">{1}</param>
    <result>
    <param name="location">/index.jsp</param>
    <param name="parse">false</param>
        <param name="encode">false</param>
    </result>
</action>

以下是错误：

HTTP ERROR 404
Problem accessing /user/jr@jrgalia.com. Reason:
   NOT_FOUND
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