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http://issues.apache.org/bugzilla/show_bug.cgi?id=31761

NullPointerException in ActionServlet

           Summary: NullPointerException in ActionServlet
           Product: Struts
           Version: 1.2.4
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Minor
          Priority: Other
         Component: Controller
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


If somebody mistypes the name of a struts-config file (or gives the name of a 
non-existent one) in the web.xml file, a nasty NullPointerException occurs.  
For example:

<servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>

  ...

  <init-param>
    <param-name>config/path2</param-name>
    <param-value>/WEB-INF/strust-config-path2.xml</param-value>
  </init-param>
</servlet>

(notice that I purposely added a mispelling in the <param-value>), 
ActionServlet.parseModuleConfigFile will throw a NullPointerException without 
much additional information.  When you have a billion different config modules 
(as we do), it can be almost impossible to troubleshoot without stepping into 
the source code.

Propose adding a check to parseModuleConfigFile that will throw a more 
meaningful exception, including the name of the module whose config file it was 
unable to find to aid troubleshooting when this situation occurs.

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