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http://jira.qos.ch/browse/LBCLASSIC-36?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=11202#action_11202
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Ceki Gulcu commented on LBCLASSIC-36:
-------------------------------------
Right. The working assumption here is that the scope of synchronization will be
reduced in future logback versions.
> Synchronization of SimpleDateFormat object in DateConverter
> -----------------------------------------------------------
>
> Key: LBCLASSIC-36
> URL: http://jira.qos.ch/browse/LBCLASSIC-36
> Project: logback-classic
> Issue Type: Bug
> Components: Other
> Affects Versions: unspecified
> Environment: Operating System: All
> Platform: All
> Reporter: Anders Hammar
> Assignee: Ceki Gulcu
> Attachments: DateConverter_patch.java, DateFormatPerfTest.java,
> dateformattest.zip, DoubleCheckedLocking.patch
>
>
> According to the API documentation of SimpleDateFormat, date formats are not
> synchronized and it is recommended to create separate format instances for
> each thread.
> However, a possibly simpler (mer efficient) solution would be to synchronize
> on the SimpleDateFormat object in the convert() method to prevent two threads
> to access it concurrently.
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