'''
2014. 5. 23 오후 4:11:40 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
심각: The web application [] appears to have started a thread named [NFLoadBalancer-PingTimer-suroClient] but has failed to stop it. This is very likely to create a memory leak.
...
...
2014. 5. 23 오후 4:11:40 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
심각: The web application [] appears to have started a thread named [AsyncSuroClientPoller-0] but has failed to stop it. This is very likely to create a memory leak.
2014. 5. 23 오후 4:11:40 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
...
...
정보: Stopping Coyote HTTP/1.1 on http-10004
Exception in thread "NFLoadBalancer-PingTimer-suroClient" java.lang.NullPointerException
at com.netflix.loadbalancer.BaseLoadBalancer$PingTask.run(BaseLoadBalancer.java:583)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
'''