springboot+mina框架服务端的实现（三） ------ 关于用tomcat优雅关闭mina的简单研究
在之前的代码中，创建mina连接时，NioSocketAcceptor采用的注解@bean中，destroyMethod是destroy。
在tomcat中执行shutdown.sh后，可能会出现内存泄漏的情况，例如：
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.6.RELEASE)
2019-07-08 15:26:14.928 INFO 27200 --- [250-startStop-1] org.my.ServletInitializer : Starting ServletInitializer on ybtserver with PID 27200 (/usr/src/springboot_mina-0.0.1-SNAPSHOT/WEB-INF/classes started by root in /usr/local/tomcat/bin)
2019-07-08 15:26:14.932 INFO 27200 --- [250-startStop-1] org.my.ServletInitializer : No active profile set, falling back to default profiles: default
08-Jul-2019 15:26:15.844 INFO [192.168.10.250-startStop-1] org.apache.catalina.core.ApplicationContext.log Initializing Spring embedded WebApplicationContext
2019-07-08 15:26:15.845 INFO 27200 --- [250-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 860 ms
2019-07-08 15:26:16.136 INFO 27200 --- [250-startStop-1] org.my.mina.handler.ServerHandler : >>>>>> server handlers set success!
2019-07-08 15:26:16.595 INFO 27200 --- [250-startStop-1] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2019-07-08 15:26:16.825 INFO 27200 --- [250-startStop-1] org.my.ServletInitializer : Started ServletInitializer in 2.394 seconds (JVM running for 4.674)
2019-07-08 15:26:16.832 INFO 27200 --- [250-startStop-1] org.my.mina.MinaServerRun : ---springboot mina server start---
08-Jul-2019 15:26:16.895 INFO [192.168.10.250-startStop-1] org.apache.jasper.servlet.TldScanner.scanJars 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.
08-Jul-2019 15:26:16.941 WARNING [main] org.apache.catalina.mapper.MapperListener.findDefaultHost Unknown default host [localhost] for service [StandardService[Catalina]]
08-Jul-2019 15:26:16.943 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:26:16.952 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:26:16.954 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 4059 ms
08-Jul-2019 15:26:44.670 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
08-Jul-2019 15:26:44.671 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:26:44.682 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:26:44.688 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
08-Jul-2019 15:26:44.696 INFO [192.168.10.250-startStop-2] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
08-Jul-2019 15:26:44.722 WARNING [192.168.10.250-startStop-2] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [NioSocketAcceptor-2] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(ClassLoader.java:760)
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2401)
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:859)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1333)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1185)
ch.qos.logback.classic.spi.PackagingDataCalculator.populateFrames(PackagingDataCalculator.java:74)
ch.qos.logback.classic.spi.PackagingDataCalculator.calculate(PackagingDataCalculator.java:58)
ch.qos.logback.classic.spi.ThrowableProxy.calculatePackagingData(ThrowableProxy.java:142)
ch.qos.logback.classic.spi.LoggingEvent.(LoggingEvent.java:122)
ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:419)
ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:383)
ch.qos.logback.classic.Logger.warn(Logger.java:692)
org.apache.mina.util.DefaultExceptionMonitor.exceptionCaught(DefaultExceptionMonitor.java:47)
org.apache.mina.core.polling.AbstractPollingIoAcceptor$Acceptor.run(AbstractPollingIoAcceptor.java:497)
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
08-Jul-2019 15:26:44.734 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:26:44.738 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:26:44.741 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:26:44.742 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-20009"]
查询了网上的资料，打算采用ServletContextListener来启动mina，通过contextDestroyed方法来关闭mina，同时去掉@bean注解中的destroyMethod参数。
首先注释掉MinaServerRun类的@Component注解，不再由这个类启动mina。
然后创建一个listener来启动mina，实现如下：
@WebListener
public class MinaRunServletContextListener implements ServletContextListener {
private static final Logger logger = LoggerFactory.getLogger(MinaRunServletContextListener.class);
@Autowired
private NioSocketAcceptor acceptor;
@Override
public void contextDestroyed(ServletContextEvent sce) {
logger.info("---server acceptor unbind---");
// System.out.println("---server acceptor unbind---" + Thread.currentThread().getName());
acceptor.unbind();
logger.info("---server acceptor dispose---");
// System.out.println("---server acceptor dispose---" + Thread.currentThread().getName());
acceptor.dispose();
}
@Override
public void contextInitialized(ServletContextEvent sce) {
WebApplicationContextUtils.getRequiredWebApplicationContext(sce.getServletContext())
.getAutowireCapableBeanFactory().autowireBean(this);
try {
acceptor.bind(new InetSocketAddress(Const.PORT));
logger.info("---springboot mina server start---");
} catch (IOException e) {
logger.error("---springboot mina server start error : ", e.getMessage() + "---");
}
}
}
同时启动类中，加上@ServletComponentScan注解， 以便能够扫描到自定义的这个listener。
结果如下：
08-Jul-2019 15:36:48.361 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
08-Jul-2019 15:36:48.362 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:36:48.373 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:36:48.379 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
08-Jul-2019 15:36:48.386 INFO [192.168.10.250-startStop-1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
08-Jul-2019 15:36:48.414 WARNING [192.168.10.250-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [NioSocketAcceptor-2] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Object.wait(Native Method)
org.apache.mina.core.future.DefaultIoFuture.await0(DefaultIoFuture.java:218)
org.apache.mina.core.future.DefaultIoFuture.awaitUninterruptibly(DefaultIoFuture.java:148)
org.apache.mina.core.polling.AbstractPollingIoProcessor.dispose(AbstractPollingIoProcessor.java:188)
org.apache.mina.core.service.SimpleIoProcessorPool.dispose(SimpleIoProcessorPool.java:337)
org.apache.mina.core.polling.AbstractPollingIoAcceptor$Acceptor.run(AbstractPollingIoAcceptor.java:515)
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
08-Jul-2019 15:36:48.416 WARNING [192.168.10.250-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [NioProcessor-5] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:351)
java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:941)
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
08-Jul-2019 15:36:48.423 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:36:48.428 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:36:48.432 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:36:48.433 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-20009"]
好像不太对，除了NioSocketAcceptor外，NioProcessor创建的线程也出现了内存泄漏的情况，而且定义的contextDestroyed方法中的日志也没打印，怎么回事？
查询了网上的众多帖子，终于在一个帖子中找到了可能的原因：
springboot优雅的关闭应用
里面提到：
将springboot应用注册为linux服务时，发现通过service xxx stop命令停止应用时，contextDestroyed的日志根本没打印出来，怀疑是LOGGER对象已经被jvm回收，于是改成System.out，这次begin打印出来了，但是并没有调用 ShutdownUtil.destroy()方法，怀疑同上，具体的机制没去详细了解，猜测是springboot自己的回收策略，或者是该插件的坑。
于是采用sysout试了一下，结果如下：
08-Jul-2019 15:42:15.213 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
08-Jul-2019 15:42:15.214 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:42:15.224 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:42:15.230 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
08-Jul-2019 15:42:15.237 INFO [192.168.10.250-startStop-1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
---server acceptor unbind---192.168.10.250-startStop-1
---server acceptor dispose---192.168.10.250-startStop-1
08-Jul-2019 15:42:15.262 WARNING [192.168.10.250-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [NioSocketAcceptor-2] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.security.AccessController.getStackAccessControlContext(Native Method)
java.security.AccessController.getContext(AccessController.java:820)
java.lang.Thread.init(Thread.java:412)
java.lang.Thread.init(Thread.java:349)
java.lang.Thread.(Thread.java:675)
java.util.concurrent.Executors$DefaultThreadFactory.newThread(Executors.java:613)
java.util.concurrent.ThreadPoolExecutor$Worker.(ThreadPoolExecutor.java:612)
java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:925)
java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1368)
org.apache.mina.core.polling.AbstractPollingIoProcessor.startupProcessor(AbstractPollingIoProcessor.java:475)
org.apache.mina.core.polling.AbstractPollingIoProcessor.dispose(AbstractPollingIoProcessor.java:185)
org.apache.mina.core.service.SimpleIoProcessorPool.dispose(SimpleIoProcessorPool.java:337)
org.apache.mina.core.polling.AbstractPollingIoAcceptor$Acceptor.run(AbstractPollingIoAcceptor.java:515)
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
08-Jul-2019 15:42:15.271 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:42:15.275 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:42:15.279 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:42:15.280 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-20009"]
发现sysout确实打印出来了，看来logger对象可能已经被spring回收了，但还是出现了内存泄漏的情况，这个可能是因为NioSocketAcceptor对象已经被回收了，于是注释掉contextDestroyed方法中的内容，同时在@bean注解中添加destroyMethod = "unbind"参数。
重新尝试：
08-Jul-2019 15:49:58.150 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
08-Jul-2019 15:49:58.151 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:49:58.161 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:49:58.167 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
08-Jul-2019 15:49:58.174 INFO [192.168.10.250-startStop-1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
08-Jul-2019 15:49:58.197 WARNING [192.168.10.250-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [pool-3-thread-1] 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.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460)
java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:362)
java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:941)
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
08-Jul-2019 15:49:58.207 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:49:58.210 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:49:58.213 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:49:58.214 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-20009"]
还是存在内存泄漏情况，打算放弃这种方式，采用最初的方式试一下，通过MinaServerRun类启动，毕竟最初的方式没有尝试修改destroyMethod后是否能正常使用。
结果如下：
08-Jul-2019 15:53:27.170 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
08-Jul-2019 15:53:27.171 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:53:27.182 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:53:27.188 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
08-Jul-2019 15:53:27.193 INFO [192.168.10.250-startStop-1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
08-Jul-2019 15:53:27.206 WARNING [192.168.10.250-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [pool-3-thread-1] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460)
java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:362)
java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:941)
java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1066)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1127)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
java.lang.Thread.run(Thread.java:745)
08-Jul-2019 15:53:27.211 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:53:27.214 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:53:27.217 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:53:27.218 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-20009"]
怎么还是有问题，头都大了。。。。。。
尝试将destroyMethod换成dispose：
08-Jul-2019 15:55:52.872 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
08-Jul-2019 15:55:52.873 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:55:52.883 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:55:52.888 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
08-Jul-2019 15:55:52.895 INFO [192.168.10.250-startStop-1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
08-Jul-2019 15:55:52.941 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:55:52.944 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:55:52.948 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:55:52.949 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-20009"]
终于不再出现内存泄漏情况。。。。。。
为避免是偶尔出现，再次尝试：
08-Jul-2019 15:57:06.149 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
08-Jul-2019 15:57:06.150 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:57:06.161 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:57:06.167 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
08-Jul-2019 15:57:06.173 INFO [192.168.10.250-startStop-1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
08-Jul-2019 15:57:06.213 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:57:06.216 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:57:06.219 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:57:06.219 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:57:57.310 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
08-Jul-2019 15:57:57.311 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:57:57.319 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:57:57.325 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
08-Jul-2019 15:57:57.330 INFO [192.168.10.250-startStop-1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
08-Jul-2019 15:57:57.358 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:57:57.361 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 15:57:57.364 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-20080"]
08-Jul-2019 15:57:57.365 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-20009"]
貌似可以了，看来采用listener的方式应该也行的通，于是尝试使用listener，调整的地方和上面尝试listener时一样，在contextDestroyed方法中多打印一句System.out.println("---test contextDestroyed method---");
结果如下：
08-Jul-2019 16:03:03.981 INFO [main] org.apache.catalina.core.StandardServer.await A valid shutdown command was received via the shutdown port. Stopping the Server instance.
08-Jul-2019 16:03:03.982 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-20080"]
08-Jul-2019 16:03:03.992 INFO [main] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 16:03:03.998 INFO [main] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
08-Jul-2019 16:03:04.003 INFO [192.168.10.250-startStop-1] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
---test contextDestroyed method---
08-Jul-2019 16:03:04.041 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-20080"]
08-Jul-2019 16:03:04.043 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 16:03:04.046 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-20080"]
08-Jul-2019 16:03:04.046 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-20009"]
God bless me !!!
终于优雅的关闭了mina！！！
还是建议通过MinaServerRun类来启动mina，因为可以在启动mina服务后，增加钩子方法，当linux采用kill指令关闭tomcat时，还可以优雅的关闭mina：
Runtime.getRuntime().addShutdownHook(new Thread() {
@Override
public void run() {
logger.info("---server acceptor unbind---");
acceptor.unbind();
logger.info("---server acceptor dispose---");
acceptor.dispose();
}
});
首先查出来tomcat所在的进程，然后使用kill指令：
[root@server bin]# ps -ef|grep tomcat
root 31849 1 0 16:08 pts/0 00:00:00 /bin/sh /usr/local/tomcat/bin/catalina.sh start
root 31850 31849 99 16:08 pts/0 00:00:18 /usr/local/jdk1.8.0_66/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar -Dcatalina.base=/usr/local/tomcat -Dcatalina.home=/usr/local/tomcat -Djava.io.tmpdir=/usr/local/tomcat/temp org.apache.catalina.startup.Bootstrap start
root 31926 15970 0 16:08 pts/0 00:00:00 grep tomcat
[root@server bin]# kill 31850
[root@server bin]# tail -n 50 -f /usr/local/tomcat/logs/catalina.out
查看日志关键内容如下：
2019-07-08 16:08:29.872 INFO 31850 --- [ Thread-7] org.my.mina.MinaServerRun : ---server acceptor unbind---
08-Jul-2019 16:08:29.873 INFO [Thread-8] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["http-nio-20080"]
2019-07-08 16:08:29.878 INFO 31850 --- [ Thread-6] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
2019-07-08 16:08:29.880 INFO 31850 --- [ Thread-7] org.my.mina.MinaServerRun : ---server acceptor dispose---
08-Jul-2019 16:08:29.894 INFO [Thread-8] org.apache.coyote.AbstractProtocol.pause Pausing ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 16:08:29.900 INFO [Thread-8] org.apache.catalina.core.StandardService.stopInternal Stopping service [Catalina]
08-Jul-2019 16:08:29.906 INFO [192.168.10.250-startStop-2] org.apache.catalina.core.ApplicationContext.log Closing Spring root WebApplicationContext
08-Jul-2019 16:08:29.918 INFO [Thread-8] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-20080"]
08-Jul-2019 16:08:29.921 INFO [Thread-8] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-20009"]
08-Jul-2019 16:08:29.924 INFO [Thread-8] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-20080"]
08-Jul-2019 16:08:29.924 INFO [Thread-8] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-20009"]
可以看到NioSocketAcceptor对象被正常的关闭了。
工程的github地址：
https://github.com/gavinL93/springboot_mina