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From Hari Mailvaganam <>
Subject Re: Failed JDBC connection hangs Tomcat
Date Mon, 31 Jan 2005 04:06:07 GMT
The JTDS driver can cause the hanging you described - this has occured
in a test we did on Win 2k, SQL Server 2k, 1.5 JDK.


Hari Mailvaganam

On Sun, 30 Jan 2005 08:39:50 +0200, Igor <> wrote:
> We have the same problem, that described in
> There is ServletContextListener in our application, that schedule two tasks for repeated
fixed rate execution on context initialization (Timer.scheduleAtFixedRate).
> First task is executed every minute. It queries MS SQL server, second task is executed
every hour.
> If MS SQL server goes down, first task tries to use connection to database.
> After this Tomcat may hang: when user tries to download a page, he or her will wait for
a long time (more that 1 day).
> At the same time second taks (that is executed every hour) works as it was expected:
there are corresponding entries in log file.
> First task is executed in separate thread, and I do not understand how can it hang whole
tomcat (at least one context).
> We use JDK 1.5, tomcat 5.0.28. The same problem was on 1.4.2. Both for MS and JTDS drivers
> Does somebody know how can I prevent tomcat from hang in such situations?
> Thank you in advance,
> Igor
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