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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=17050

Invalid ActionMessage key causes a NullPointerException in MessagesTag

           Summary: Invalid ActionMessage key causes a NullPointerException
                    in MessagesTag
           Product: Struts
           Version: 1.1 Beta 3
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Custom Tags
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


Try something like

messages.add("somePropertyName", new ActionMessage("thisKeyNotDefinedInBundle"));
saveMessages(request, messages);

in your Action, and then iterate over the messages with

<html:messages id="msg" message="true"><bean:write name="msg"/></html:messages>

You will get a NullPointerException in MessagesTag due in line 250 (as of 1.1b3), 
which is (comment mine):

pageContext.setAttribute(id, msg);  // <-- msg can be null here!

The exception bubbles up to whatever handler is responsible for catching it, leaving a 
Struts newbie deeply confused and bug hunting for at least the next 30 minutes.

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