Hello,
We are using Tomcat 7.0.94 version and we have facing memory leakage issue
when tomcat server is going to shutdown.
Please help in this case, how to solve these kind of logs?
Please find below sample logs from catalina.log file and code.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [Timer-0] but has failed to stop it. This is very likely to create a
memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [schedulerFactory_Worker-1] but has failed to stop it. This is very
likely to create a memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [schedulerFactory_Worker-2] but has failed to stop it. This is very
likely to create a memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [schedulerFactory_Worker-3] but has failed to stop it. This is very
likely to create a memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [schedulerFactory_Worker-4] but has failed to stop it. This is very
likely to create a memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [schedulerFactory_Worker-5] but has failed to stop it. This is very
likely to create a memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [schedulerFactory_Worker-6] but has failed to stop it. This is very
likely to create a memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [schedulerFactory_Worker-7] but has failed to stop it. This is very
likely to create a memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [schedulerFactory_Worker-8] but has failed to stop it. This is very
likely to create a memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [schedulerFactory_Worker-9] but has failed to stop it. This is very
likely to create a memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
clearReferencesThreads
SEVERE: The web application [/TLSAdmin] appears to have started a thread
named [schedulerFactory_Worker-10] but has failed to stop it. This is very
likely to create a memory leak.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
checkThreadLocalMapForLeaks
SEVERE: The web application [/TLSAdmin] created a ThreadLocal with key of
type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@794fa987]) and a
value of type [flex.messaging.config.SystemSettings] (value
[flex.messaging.config.SystemSettings@7dca495e]) 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.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
checkThreadLocalMapForLeaks
SEVERE: The web application [/TLSAdmin] created a ThreadLocal with key of
type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@794fa987]) and a
value of type [flex.messaging.config.SystemSettings] (value
[flex.messaging.config.SystemSettings@7dca495e]) 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.
Oct 10, 2019 6:35:36 PM org.apache.catalina.loader.WebappClassLoaderBase
checkThreadLocalMapForLeaks
SEVERE: The web application [/TLSAdmin] created a ThreadLocal with key of
type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@794fa987]) and a
value of type [flex.messaging.config.SystemSettings] (value
[flex.messaging.config.SystemSettings@7dca495e]) 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.
Oct 10, 2019 6:35:36 PM org.apache.coyote.AbstractProtocol stop
We have implements below code for "ServletContextListener"
public class LogbackContextFinalizer implements ServletContextListener{
private Logger logger =
Logger.getLogger(LogbackContextFinalizer.class);
private GenericObjectPool objectPool;
@Override
public void contextDestroyed(ServletContextEvent
contextEvent) {
logger.info("Context Destroyed Method:");
//ServletContext context =
contextEvent.getServletContext();
//LoggerContext loggerContext =
(LoggerContext) LoggerFactory.getILoggerFactory();
//loggerContext.stop();
try {
objectPool.close();
} catch (Exception e) {
e.printStackTrace();
}
Enumeration<Driver> drivers =
DriverManager.getDrivers();
while (drivers.hasMoreElements()) {
Driver driver = drivers.nextElement();
try {
DriverManager.deregisterDriver(driver);
logger.info("deregistering jdbc driver: %s" + driver);
} catch (SQLException e) {
logger.info("Error deregistering driver %s"+ driver);
}
}
}
@Override
public void contextInitialized(ServletContextEvent
contextEvent) {
logger.info("Context Initialized Method:");
objectPool = new GenericObjectPool();
objectPool.setFactory(new
BasePoolableObjectFactory() {
private AtomicInteger
counter = new AtomicInteger(0);
@Override
public Object makeObject()
throws Exception {
String str =
"Object #" + counter.incrementAndGet();
logger.info("Creating "+str);
return str;
}
@Override
public void
destroyObject(Object obj) throws Exception {
logger.info("Destroying "+obj);
}
});
objectPool.setMinIdle(3);
objectPool.setTimeBetweenEvictionRunsMillis(1000);
}
}
Thanks & Regards,
Ankit Desai | Associate Project Lead
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