[ http://jira.qos.ch/browse/LBCLASSIC-36?page=com.atlassian.jira.plugin.system... ] Ceki Gulcu commented on LBCLASSIC-36: -------------------------------------

1. There is no reason to synchronize in the Joda test. DateTimeFormatter should be declared external to the method and the synchronization should be removed since DateTimeFormatter is thread safe.

I beleive that to be incorrect. While Joda's DateTimeFormatter may be thread safe, assignment to a long is not an atomic operation in Java. The synchronized block exist to protect the "cache" not DateTimeFormatter.

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

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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