monitor to see if login is working

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I have a java web app that users log into that occasionally stops
allowing logins.  Initially I thought that the problem was the
connection to the db was broken, but users can retrieve their
passwords, so that's not the case.
I'm looking for something that will check the site every few minutes
and attempt a login and read something on the login success page, then
email me if it fails.  Is there anything that can do this?  I've got a
tool that will attempt to log in using regular website authentication,
but doesn't work on a website with a login form.  Any ideas would be
greatly appreciated.


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