I'm not sure if I'm answering your question, but I have situation where I
need to check to make sure a database is online and if it is not, fire off
an email to a list of administrators.
I do this by having a Singleton class that handles the database access. This
singleton fires off a thread when it starts up that checks the connection
every X minutes. If the connection fails it uses standard JavaMail code
to send an email to the list of administrators.
All the servlets in my app get a reference to the singleton in their init()
method so the first servlet hit starts the thread that monitors the connection.
(actually I have a parent class that does this and all my servlets
implement this parent class... but anyway.)
(If you are using WebLogic, I believe you should use their event object and
not start up your own thread.)
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