Как устранить предупреждение об утечке памяти tomcat — веб-приложение запустило поток, но не смогло его остановить

Я использую библиотеку com.ning.async-http-client(1.9.40) для отправки асинхронного запроса. При выключении tomcat я получаю следующие сообщения в журнале catalina.out: -

SEVERE: The web application [/xyz] appears to have started a thread named [Hashed wheel timer #1] but has failed to stop it. This is very likely to create a memory leak.
Jul 03, 2017 1:27:15 PM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
SEVERE: The web application [/xyz] appears to have started a thread named [New I/O worker #1] but has failed to stop it. This is very likely to create a memory leak.
Jul 03, 2017 1:27:15 PM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
SEVERE: The web application [/xyz] appears to have started a thread named [New I/O worker #2] but has failed to stop it. This is very likely to create a memory leak.
Jul 03, 2017 1:27:15 PM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
SEVERE: The web application [/xyz] appears to have started a thread named [New I/O boss #3] but has failed to stop it. This is very likely to create a memory leak.
Jul 03, 2017 1:27:15 PM org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
SEVERE: The web application [/xyz] appears to have started a thread named [Hashed wheel timer #2] but has failed to stop it. This is very likely to create a memory leak.**

Состояние этих потоков:

"New I/O boss #3" prio=10 tid=0x00007ff3a00f9000 nid=0x17a9 runnable [0x00007ff3878f7000]
"New I/O worker #2" daemon prio=10 tid=0x00007ff3a00aa800 nid=0x17a8 runnable [0x00007ff3879f8000]
"New I/O worker #1" daemon prio=10 tid=0x00007ff3a00b8800 nid=0x17a7 runnable [0x00007ff387af9000]
"Hashed wheel timer #2" prio=10 tid=0x00007ff3a020e800 nid=0x17aa waiting on condition [0x00007ff3875f0000]
"Hashed wheel timer #1" prio=10 tid=0x00007ff3a0083000 nid=0x17a6 sleeping[0x00007ff387bfa000]

Пожалуйста, предложите способ остановить эти темы из приложения.


java memory-leaks tomcat asynchttpclient
person Khushboo    schedule 04.07.2017    source источник

Ответы (1)


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AsyncHttpClient реализует Closeable. Достаточно вызвать close(), когда ваше приложение закрывается.

Это очистит ресурсы, используемые AsyncHttpClient.

Проиллюстрировать :

public static void main(String[] args) throws Exception {
    AsyncHttpClient asyncHttpClient = new AsyncHttpClient();
    Future<Response> f = asyncHttpClient.prepareGet("http://www.google.com/").execute();
    Response r = f.get();

    asyncHttpClient.close(); // when this is commented out, the application won't exit, as the non daemon threads prevent it.
}
person bowmore    schedule 04.07.2017