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https://issues.apache.org/jira/browse/LANG-478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Henri Yandell updated LANG-478:
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Attachment: LANG-478.patch
Attaching patch to move to nanoTime.
> StopWatch does not resist to system time changes
> ------------------------------------------------
>
> Key: LANG-478
> URL: https://issues.apache.org/jira/browse/LANG-478
> Project: Commons Lang
> Issue Type: Bug
> Affects Versions: 2.3
> Environment: all operating systems.
> Reporter: Regis Desgroppes
> Fix For: 3.0
>
> Attachments: LANG-478.patch
>
>
> org.apache.commons.lang.time.StopWatch seems to be relying on wall clock,
> i.e. by calling java.lang.System.currentTimeMillis() to sample current time.
> When a system time change occurs (user action, NTP synchronization...)
> between 2 calls to StopWatch.getTime(), the difference between the 2 samples
> is wrong: the measured duration may noticeably differ from the real one.
> Moreover, should the system time change consist in a backward adjustment, the
> difference could be negative.
> In order to make StopWatch resistant to system time changes, would it be
> possible to use the process time, i.e. by making implementation calling
> java.lang.System.nanoTime() -multiplied by appropriate factor, of course.
> Thanks a lot,
> Regis.
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