It will throw the nullpoint exception when i try to run the  Apps 
[shopping-cart].
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                 Key: WW-1405
                 URL: http://issues.apache.org/struts/browse/WW-1405
             Project: Struts 2
          Issue Type: Bug
          Components: Component Management
            Reporter: Tim Chen
            Priority: Critical


Reproduce step:   
1.  Check out the source code from svn,
2. Use the mvn install to build the project
3. Copy the struts2-shopping-cart.war to tomcat

Research:

  I debug the code,  the problem happen on the 
org.apache.struts2.components.URL [line 180/line 213/ line 220]. 
The code  [Dispatcher.getInstance().isPortletSupportActive()] is not careful. 
The Dispatcher.getInstance() maybe null sometime.


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