<s:url> tag can not generate proper namespace when don't assign namespace value 
in tag.
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                 Key: WW-3769
                 URL: https://issues.apache.org/jira/browse/WW-3769
             Project: Struts 2
          Issue Type: Bug
          Components: Plugin - Portlet
    Affects Versions: 2.3.1.2
            Reporter: Yagumo Pei


I upgrade my application from 2.1.8 to 2.3.1.2, then find that <s:url> can't 
geneate proper result when I don't assign namespace value in the <s:url> tag. 
e.g, <s:url value="aaaa/">, in the old version, I got 
"http://xxx/xxxx&struts.portlet.action=/somenamespace/aaaa";, but in the new 
version, I got "http://xxx/xxxx&struts.portlet.action=/aaaa";, the namespace is 
missing.

I check source code between 2.1.8 and 2.3.1.2, and find in 
org.apache.struts2.components.PortletUrlRenderer
public void renderUrl(Writer writer, UrlProvider urlComponent) {
    ...
    
urlComponent.setNamespace(urlComponent.determineNamespace(urlComponent.getNamespace(),
 urlComponent.getStack(),urlComponent.getHttpServletRequest()));  // Line 78, 
in 2.1.8
    ...
}

This statement is missing in 2.3.1.2, which cause struts can't find namespace 
by action name. I think it's losing feature.

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