On 16/12/2020 14:04, Christopher Schultz wrote:
> All,
> 
> I'm working with a partner to troubleshoot a SAML-based service where
> their SAML responses are reaching us after timing-out. I tracked that
> down to an incorrect system time on many of their servers.
> 
> Once fixing the clocks -- hopefully using ntpd or similar which can
> smear time adjustments out over time to avoid huge, sudden clock changes
> -- would they need to restart their Java VMs running Tomcat?
> 
> The only thing I can think of is that the "fast time format" used to
> produce "Date" response headers and access-log timestamps might be
> disturbed, but a quick look at the code doesn't lead me to believe that
> it would suffer from a large system clock change. It doesn't, for
> example, assume that every call to System.currentTimeMillis() /
> System.nanoTime() returns a value larger (or equal to) than any previous
> call.
> 
> Can anyone think of any reason why Tomcat (or the JVM) would need to be
> restarted?

Restarted? No.

You might see things like:
- longer/shorter (possibly negative) request processing times
- earlier than expected session timeouts
- etc.

Mark

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