Hi,

>Is there a way to programmatically make the Context unavailable?

Not a portable/container-independent way.  Instead, write a simple
filter that calls YourSingleton.isEverythingOk(), and if the response is
negative, redirects the request to a "app unavailable page" (or throws
an exception, or does whatever you want).  Map this filter to
url-pattern /* and you're all set (while retaining portability).

Yoav



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