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http://jira.qos.ch/browse/LBCLASSIC-75?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=10751#action_10751
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Ralph Goers commented on LBCLASSIC-75:
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I would have reopend LBCLASSIC-36 but I don't have permission. The resolution
in LBCLASSIC-36 is insufficient. First, synchronization on the doAppend method
of AppenderBase is a bug that needs to be corrected as documented in LBCORE-58.
Secondly, SimpleDateFormat is horribly slow. The DateConverters should be
modified to use Joda Time instead of the JDK Date and Time handling. Joda Time
is both thread safe and fast. In addition, the Joda Time constructs will be
brought in to Java 7 so this will provide an easy migration when that JDK
becomes the baseline.
> Synchronization of SimpleDateFormat object in DateConverter
> -----------------------------------------------------------
>
> Key: LBCLASSIC-75
> URL: http://jira.qos.ch/browse/LBCLASSIC-75
> Project: logback-classic
> Issue Type: Bug
> Components: Other
> Affects Versions: unspecified
> Environment: Operating System: All
> Platform: All
> Reporter: Ralph Goers
> Assignee: Logback dev list
>
> 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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