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当context stop的时候，如果thread pool的thread没有正常停止的话，而且ThreadLocal中引用了webclassloader加载的对象，有很有可能造成内存泄露，一个解决办法就是杀掉所有的threadpool的线程。Tomcat的ThreadLocalLeakPreventionListener就是这样一个原理 Engine engine = (Engine) context.getParent().getParent();

Service service = engine.getService();        Connector[] connectors = service.findConnectors();        if (connectors != null) {            for (Connector connector : connectors) {                ProtocolHandler handler = connector.getProtocolHandler();                Executor executor = null;                if (handler != null) {                    executor = handler.getExecutor();                }                if (executor instanceof ThreadPoolExecutor) {                    ThreadPoolExecutor threadPoolExecutor =                        (ThreadPoolExecutor) executor;                    threadPoolExecutor.contextStopping();                } else if (executor instanceof StandardThreadExecutor) {                    StandardThreadExecutor stdThreadExecutor =                        (StandardThreadExecutor) executor;                    stdThreadExecutor.contextStopping();                }            }        }    }

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