Make ModificationWatcher replacable
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                 Key: WICKET-2340
                 URL: https://issues.apache.org/jira/browse/WICKET-2340
             Project: Wicket
          Issue Type: Improvement
          Components: wicket
         Environment: Mainly on Google App Engine
            Reporter: Nick Wiedenbrueck


Google App Engine does not allow applications to spawn threads. But Wicket's 
ModificationWatcher does so. So, deploying Wicket applications on GAE will not 
work in debug mode, even when deploying on the local app engine development 
environment.

It would be nice, if  it would be possible to use a different 
ModificationWatcher that does not spawn Threads. The Problem is, that 

A) ModificationWatcher is not an Interface but a concrete class
B) ModificationWatcher is final

As a bonus it would be nice to have an optional  ModificationWatcher 
implementation in the wicket core that does not rely on threads, but instead 
checks Resources before every request, for example.

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