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From David Delbecq <>
Subject Re: tomcat hang/freeze under windows
Date Wed, 29 Aug 2007 08:46:24 GMT
Looks like a deadlock occuring at your db. You probably have a filter
that applies to each request and is deadlocking in some way. The reason
you can still reach the login page is that login page is served by
tomcat without getting through the filters.

The best way, if you have remote access to app, is to get the jvm to
issue a stacktrace. On windows, to do this, you have to hit ctrl-break
on console running jvm. An alternate way could be to quickly develop a
test war that have one servlet that issues Thread.getAllStackTraces()
(java 5) on demand.
With a stacktrace, you will know exactly where you http thread is waiting :)

En l'instant précis du 28/08/07 23:44, Roger Parkinson s'exprimait en
ces termes:
> Sorry this is question is so terse, but general approach kind of help
> would be very welcome.
> I get to the login page every time, but after that there's no
> response. Seems to be nothing relevant in the logs.
> The machine is remote from me and in a 12 hours different timezone
> (yawn...zzz) so getting access to local staff is a challenge. Hence
> the vagueness (apologies again).
> Restarting tomcat everything comes right for a while, works perfectly,
> then... freeze.
> What we are doing is deploying a pair of war files that are known to
> be running really well elsewhere (ie on my dev env plus two live
> sites). There are config options in the apps (there are also config
> options in tomcat that might be screwed too, still checking that). So
> I don't think it is the app itself. Actually we don't seem to be
> getting to the app once it freezes except for the login page.
> I'm using form based login (is that right term? throws up a JSP page
> with a user/password prompt if you're not logged in, then lets you
> proceed). Realm is through JDBC to SQLServer.
> O/s: windows 2000
> Java: jdk1.5.0_11
> Tomcat 5.5.7
> Thanks for any help.
> Roger
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