HTTP 404 response if page-class couldn't be found -> improvement: exception 
page explaining the cause
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                 Key: TAP5-515
                 URL: https://issues.apache.org/jira/browse/TAP5-515
             Project: Tapestry 5
          Issue Type: Improvement
          Components: tapestry-core
    Affects Versions: 5.1.0.0
            Reporter: manuel aldana
            Priority: Minor


If page class cannot be found (corresponding to template), you get a 404 
response.

It would be nicer to wrap this error and report the cause to this nice tapestry 
error-reporting page and suggest the fix (e.g. by wrapping the 
ClassNotFoundException to a meaningful message). 

This tapestry usage is not so unlikely:
-page class accidently not put to xxxx.pages package
-wrong tapestry app root-package configuration in web.xml (tapestry.app-package 
param)



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