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Does the system time (OS) change in a similar way?
Is it always the change of instead using CDT the timestamps switch to UTC?
Do the times at least match to some degree? I mean is it just the wrong
timezone (and same hour of the day), or is it the same instant in time just
represented from a different timezone (02:06 CDT -> 09:06 CEST)?
If the system time remains stable, it is related to the JVM. Also the fact that
a restart fixes the problem is an indication the system time is correct.
Remains the fact that the time is lost after decreasing intervals.
So there might be the question if the application can configure timezone/system
time and to find out whether it does it. If you find out which java methods
need to be called for this to change then you could check the source code for
such calls, or at least set breakpoints to be informed immediately when such a
line of code is reached.
Hiran
-----Original Message-----
From: David <rax1...@gmail.com>
Sent: Thursday, October 27, 2022 17:31
To: Tomcat Users List <users@tomcat.apache.org>
Subject: Tomcat/Java app timezone radomly changes during operation.
CAUTION: External mail. Be careful with links and attachments.
Hi all,
I've experienced an issue since the morning of the 21st that I'm hoping
to get some direction on for where to look.
An app uses the date/time to set a timeout for a password reset.
This had been working fine for years and suddenly it failed. A restart of
tomcat allowed it to work for a day, then 12 hours, then 5 hours, then 1 hr and
now is averaging a 10 minute or so working duration between tomcat restarts.
Changing the logging in the app showed that the issue is due to it sending
UTC to the DB while it is broken. Restarting Tomcat results in CDT being sent
for a while until randomly it switches again.
RHEL 7.9, jvm 1.8.0_231-b11, Tomcat 9.0.29 ntp is on, chrony is syncing, Java
states correct time when queried however unsure if it's JDK or JRE when
targeted. OS time is good.
When I redeploy the app, log timestamps for the app are in UTC as well
until restarting tomcat. During the issue the log timestamp remains in
CDT as expected, even though values passed are UTC.
I have explicitly defined the timezone in setenv.sh with no change in behavior.
Any thoughts as what to investigate are greatly appreciated.
Thanks,
David
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