这篇文章主要介绍了Spring关闭Tomcat Servlet容器时内存泄漏问题解决方案,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

出错信息

22-Sep-2017 06:19:51.064 WARNING [main] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [license] appears to have started a thread named [org.springframework.scheduling.quartz.SchedulerFactoryBean#0_Worker-1] 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.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:568)

问题分析

servlet容器关闭时发现Quartz定时器线程还在执行，对其无所适从，不懂怎么办只能强行关闭。

解决思路

在关闭容器时的contextDestroyed事件里检测ServletContext里Quartz相关属性，找到Bean然后调用它的方法结束掉。

解决方法

import java.sql.Driver;import java.sql.DriverManager;import java.sql.SQLException;import java.util.Enumeration;import javax.servlet.ServletContextEvent;import javax.servlet.ServletContextListener;import javax.servlet.ServletRequestEvent;import javax.servlet.ServletRequestListener;import javax.servlet.annotation.WebListener;import javax.servlet.http.HttpSessionEvent;import javax.servlet.http.HttpSessionListener;import org.apache.logging.log4j.web.Log4jWebSupport;import org.quartz.impl.StdScheduler;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.context.WebApplicationContext;import org.springframework.web.context.support.WebApplicationContextUtils;@WebListenerpublic class AppContextListener implements ServletContextListener{ public void contextDestroyed(ServletContextEvent event) { logger.info("Destroying Context..."); try { WebApplicationContext context = (WebApplicationContext) event.getServletContext().getAttribute( WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE); Enumeration<String> attributes = event.getServletContext().getAttributeNames(); while(attributes.hasMoreElements()) { String attr = attributes.nextElement(); Object prop = event.getServletContext().getAttribute(attr); logger.info("attribute.name: {},class:{}, value:{}",attr,prop.getClass().getName(),prop); } String[] beanNames = context.getBeanDefinitionNames(); for(String beanName:beanNames) { Object bean = context.getBean(beanName); logger.info("found bean attribute in ServletContext,name:{},class:{},value:{}", beanName,bean.getClass().getName(),bean); if(beanName.contains("quartz")&&beanName.contains("Scheduler")){ StdScheduler scheduler = (StdScheduler)context.getBean("org.springframework.scheduling.quartz.SchedulerFactoryBean#0"); logger.info("发现quartz定时任务"); logger.info("beanName:{},className:{}",scheduler,scheduler.getClass().getName()); if(scheduler.isStarted()) { logger.info("Quartz:waiting for job complete..."); scheduler.shutdown(true); logger.info("Quartz:all threads are complete and exited..."); } } } } catch (Exception e) { logger.error("Error Destroying Context", e); } } //https://stackoverflow.com/questions/23936162/register-shutdownhook-in-web-application public void contextInitialized(ServletContextEvent event) { //ServletContext context = event.getServletContext(); //System.setProperty("rootPath", context.getRealPath("/")); //LoggerContext ctx = (LoggerContext) LogManager.getContext(false); //ctx.reconfigure(); }|

关闭tomcat日志如下：

其他解决方法

Spring配置文件

笔者经过实践，发现在spring配置文件里设置参数也可以达到以上效果

<bean class="org.springframework.scheduling.quartz.SchedulerFactoryBean"> <property name="triggers"> <list> <ref bean="simpleTrigger" /> <ref bean="cronTrigger" /> <ref bean="secondCronTrigger"/> </list> </property> <property name="waitForJobsToCompleteOnShutdown" value="true"/> </bean>

<property name="waitForJobsToCompleteOnShutdown" value="true"/>可以在web关闭的时候关闭线程

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