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https://issues.apache.org/jira/browse/LOG4J2-768?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Scott Harrington updated LOG4J2-768:
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Comment: was deleted
(was: {code}
private static class Holder {
// the usual initialization-on-demand holder idiom
// https://en.wikipedia.org/wiki/Initialization-on-demand_holder_idiom
private static final PluginRegistry INSTANCE = new PluginRegistry();
}
{code}
Nice! I learned something new today.)
> Custom conversion specifier fails unpredictably when it should throw an error
> -----------------------------------------------------------------------------
>
> Key: LOG4J2-768
> URL: https://issues.apache.org/jira/browse/LOG4J2-768
> Project: Log4j 2
> Issue Type: Bug
> Affects Versions: 2.0, 2.0.1
> Reporter: Mikhail Dobrinin
> Priority: Minor
> Attachments: LOG4J2-768.zip
>
>
> Creating a custom {{LogEventPatternConverter}} with an existing plugin name
> and attempting to use it will *fail unpredictably* about 50% of the time on
> my machine. At first it appeared to be a race condition, but after more
> inspection the plugin name turned out to be the same as the existing thread
> name converter. The plugin manager should probably throw some kind of
> exception when it is registering a plugin whose name already is registered. I
> am attaching a zip file which you can easily import as an Eclipse project to
> reproduce.
> *Succesful Output*:
> {code}
> 2014-08-06 15:10:08,539 ERROR [1] tests.TestLogger (TestLogger.java:27) -
> running configuration: C:\dev\temp\log4j2-testing\log4j2.xml
> 2014-08-06 15:10:08,540 INFO [1] tests.TestLogger (TestLogger.java:29) -
> info level
> 2014-08-06 15:10:08,541 ERROR [1] tests.TestLogger (TestLogger.java:30) -
> error level
> {code}
> *Failure Output*:
> {code}
> 2014-08-06 15:09:54,179 ERROR Unrecognized format specifier [T]
> 2014-08-06 15:09:54,179 ERROR Unrecognized conversion specifier [T] starting
> at position 11 in conversion pattern.
> 2014-08-06 15:09:54,195 ERROR [%T] tests.TestLogger (TestLogger.java:27) -
> running configuration: C:\dev\temp\log4j2-testing\log4j2.xml
> 2014-08-06 15:09:54,196 INFO [%T] tests.TestLogger (TestLogger.java:29) -
> info level
> 2014-08-06 15:09:54,196 ERROR [%T] tests.TestLogger (TestLogger.java:30) -
> error level
> {code}
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