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https://issues.apache.org/jira/browse/LOG4J2-323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Remko Popma updated LOG4J2-323:
-------------------------------
Fix Version/s: (was: 2.1)
2.2
I've looked at this and I don't think it is possible to clear the ThreadLocals
held by AsyncLogger. There is no {{ThreadLocal.clear()}} method that would
remove the data held for all threads, only a {{remove}} method that would
remove the data held for the current thread.
So basically this issue depends on the fix for LOG4J2-493.
Note that there are two workarounds for this issue (similar to LOG4J2-493):
* Put the log4j2 jar files in WEB-INF/lib of your web application.
* Or: do _not_ use async loggers by setting system property
Log4jContextSelector, instead use async loggers by using <AsyncLogger> and
<AsyncRoot> in the configuration.
Either of the above workarounds will prevent the memory leak.
> ThreadLocal-leak on tomcat shutdown when using async logging
> ------------------------------------------------------------
>
> Key: LOG4J2-323
> URL: https://issues.apache.org/jira/browse/LOG4J2-323
> Project: Log4j 2
> Issue Type: Bug
> Affects Versions: 2.0-beta9
> Environment: Mac OS X 10.8.4, Tomcat 7.0.42, java version 1.6.0_51
> Reporter: Michael Kloster
> Assignee: Remko Popma
> Priority: Minor
> Labels: Async
> Fix For: 2.2
>
>
> When shutting down Tomcat 7.0.42, catalina.out displays the following warning
> indicating a memory leak:
> {code}
> Jul 28, 2013 9:55:59 AM org.apache.coyote.AbstractProtocol start
> INFO: Starting ProtocolHandler ["http-bio-8080"]
> Jul 28, 2013 9:55:59 AM org.apache.coyote.AbstractProtocol start
> INFO: Starting ProtocolHandler ["ajp-bio-8009"]
> Jul 28, 2013 9:55:59 AM org.apache.catalina.startup.Catalina start
> INFO: Server startup in 841 ms
> Jul 28, 2013 9:56:09 AM org.apache.catalina.core.StandardServer await
> INFO: A valid shutdown command was received via the shutdown port. Stopping
> the Server instance.
> Jul 28, 2013 9:56:09 AM org.apache.coyote.AbstractProtocol pause
> INFO: Pausing ProtocolHandler ["http-bio-8080"]
> Jul 28, 2013 9:56:09 AM org.apache.coyote.AbstractProtocol pause
> INFO: Pausing ProtocolHandler ["ajp-bio-8009"]
> Jul 28, 2013 9:56:09 AM org.apache.catalina.core.StandardService stopInternal
> INFO: Stopping service Catalina
> Jul 28, 2013 9:56:09 AM org.apache.catalina.loader.WebappClassLoader
> checkThreadLocalMapForLeaks
> SEVERE: The web application [/asynclog] created a ThreadLocal with key of
> type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@648bfdea]) and a
> value of type [org.apache.logging.log4j.core.async.AsyncLogger.Info] (value
> [org.apache.logging.log4j.core.async.AsyncLogger$Info@4e26d560]) but failed
> to remove it when the web application was stopped. Threads are going to be
> renewed over time to try and avoid a probable memory leak.
> Jul 28, 2013 9:56:09 AM org.apache.coyote.AbstractProtocol stop
> INFO: Stopping ProtocolHandler ["http-bio-8080"]
> Jul 28, 2013 9:56:09 AM org.apache.coyote.AbstractProtocol stop
> INFO: Stopping ProtocolHandler ["ajp-bio-8009"]
> Jul 28, 2013 9:56:09 AM org.apache.coyote.AbstractProtocol destroy
> INFO: Destroying ProtocolHandler ["http-bio-8080"]
> Jul 28, 2013 9:56:09 AM org.apache.coyote.AbstractProtocol destroy
> INFO: Destroying ProtocolHandler ["ajp-bio-8009"]
> {code}
> {code:xml|title=log4j2.xml|borderStyle=solid}
> <?xml version="1.0" encoding="UTF-8"?>
> <configuration status="WARN">
> <appenders>
> <FastRollingFile name="MyFileLog" filename="logs/my.log"
> filePattern="logs/my-%d{COMPACT}.log">
> <PatternLayout pattern="%d %p %c{1.} [%t] %m%n" />
> <Policies>
> <SizeBasedTriggeringPolicy size="5MB" />
> </Policies>
> </FastRollingFile>
> <Console name="Console" target="SYSTEM_OUT">
> <PatternLayout pattern="%d %p %c{1.} [%t] %m%n" />
> </Console>
> </appenders>
> <loggers>
> <logger name="mylogger" level="INFO" additivity="false">
> <appender-ref ref="MyFileLog" />
> </logger>
> <root level="TRACE">
> <appender-ref ref="Console" />
> </root>
> </loggers>
> </configuration>
> {code}
> {code:title=log4j2.xml|borderStyle=solid}
> #!/bin/bash
> CATALINA_OPTS=-DLog4jContextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector
> {code}
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