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https://issues.apache.org/jira/browse/JCR-3775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13981558#comment-13981558
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Jukka Zitting commented on JCR-3775:
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Actually there are common enough cases where non-GMT time zones are used in
timestamps, so I added the originally described map in revision 1590132.
> Avoid lock contention in ISO8601.parse()
> ----------------------------------------
>
> Key: JCR-3775
> URL: https://issues.apache.org/jira/browse/JCR-3775
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: jackrabbit-jcr-commons
> Reporter: Jukka Zitting
> Assignee: Jukka Zitting
> Fix For: 2.8
>
>
> The ISO8601.parse() method calls the synchronized TimeZone.getTimeZone()
> method, which causes lock contention in concurrent code that frequently
> parses ISO8601 strings.
> To avoid the synchronization, we could use a static flyweight map of all
> known time zones, and only fall back to the getTimeZone() method if some
> unknown time zone is encountered.
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