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From "Michael Kloster (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LOG4J2-323) ThreadLocal-leak on tomcat shutdown when using async logging
Date Sun, 28 Jul 2013 16:47:48 GMT
Michael Kloster created LOG4J2-323:
--------------------------------------

             Summary: 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
            Priority: Minor


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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