Scott created LOG4J2-570:
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Summary: Memory Leak
Key: LOG4J2-570
URL: https://issues.apache.org/jira/browse/LOG4J2-570
Project: Log4j 2
Issue Type: Bug
Components: Core
Affects Versions: 2.0-rc1
Environment: Ubuntu 12.04
Linux bos-lpuv7 3.2.0-58-generic #88-Ubuntu SMP Tue Dec 3 17:37:58 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
8 GB RAM
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)
JAVA_OPTS=-Xmx1024m -Dsun.net.inetaddr.ttl=60
-Dsun.net.inetaddr.negative.ttl=60 -Djava.net.preferIPv4Stack=true
-XX:PermSize=128m -XX:MaxPermSize=256m -XX:+UseConcMarkSweepGC
-XX:+CMSClassUnloadingEnabled
<log4j.version>2.0-rc1</log4j.version>
log4j-api
log4j-core
log4j-jcl
Spring webmvc 4.0.2.RELEASE application (simple hello world) deployed in
tomcat7.0.52 container.
Reporter: Scott
Fix For: 2.0-rc2
The tomcat7 stop, undeploy, or redeploy actions on a WAR which utilizes log4j
leaves creates a memory leak. The memory leak is believed to be log4j for the
following reasons:
1)Heap Dump reveals the classloader instance responsible for the WAR plugin (of
type org.apache.catalina.loader.WebappClassLoader) has 2 non weak/soft
reference which are of type
(org.apache.logging.log4j.core.LoggerContext$ShutdownThread) and
(org.apache.logging.log4j.core.jmx.LoggerContextAdmin) after the WAR has been
stopped or undeployed.
2)Using the SLF4J NOP logger implementation all memory is gc as expected (the
org.apache.catalina.loader.WebappClassLoader which loaded the WAR is no longer
referenced by any hard references)
This may not be unique to 2.0rc-1 and I have seen similar behavior in previous
2.0 beta releases.
This is reproducible and I can provide more information if necessary. I don't
see anywhere to attach a heap dump, but a sequence of these and simple hello
world source code can be supplied upon request.
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