Robin Jansohn created LOG4J2-1727:
-------------------------------------
Summary: Calling static method during re-/undeploy causes memory
leak in Tomcat
Key: LOG4J2-1727
URL: https://issues.apache.org/jira/browse/LOG4J2-1727
Project: Log4j 2
Issue Type: Bug
Affects Versions: 2.7
Reporter: Robin Jansohn
Pretty similar issue to LOG4J2-1419 I guess, but this is not caused by another
context AFAICS.
Reproducer webapp:
https://github.com/jansohn/log4j2-threadlocal/tree/log4j2-leaks
If I call a static method in a class which contains a Logger instance from the
{{contextDestroyed()}} method the LoggerContext gets re-initialized as the
original LoggerContext has already been destroyed (caused by the too early
log4j context shutdown, LOG4J2-658 / LOG4J2-1098).
A workaround would be to call a non-static method from an already initialized
object but I don't think this is feasible as a permanent solution.
{code:java}
@Override
public void contextDestroyed(ServletContextEvent sce) {
log.info("Servlet context is being destroyed!");
ShutdownHelper.closeConnectionPools();
//helper.closeDatabaseConnectionPools();
}
{code}
{noformat}
Dez 08, 2016 2:45:28 PM org.apache.catalina.core.StandardContext reload
INFORMATION: Reloading Context with name [/log4j2webapp] has started
Dez 08, 2016 2:45:28 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
WARNUNG: The web application [log4j2webapp] appears to have started a thread
named [Log4j2-TF-6-Scheduled-2] but has failed to stop it. This is very likely
to create a memory leak. Stack trace of thread:
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2078)
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1093)
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:809)
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1067)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
Dez 08, 2016 2:45:28 PM org.apache.jasper.servlet.TldScanner scanJars
INFORMATION: At least one JAR was scanned for TLDs yet contained no TLDs.
Enable debug logging for this logger for a complete list of JARs that were
scanned but no TLDs were found in them. Skipping unneeded JARs during scanning
can improve startup time and JSP compilation time.
2016-12-08 14:45:29,335 INFO
[ContainerBackgroundProcessor[StandardEngine[Catalina]]]
com.test.webapp.MyWebapp - Servlet context is being initialized!
Dez 08, 2016 2:45:29 PM org.apache.catalina.core.StandardContext reload
INFORMATION: Reloading Context with name [/log4j2webapp] is completed
{noformat}
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