Spring關閉Tomcat Servlet容器時記憶體洩漏問題解決方案
阿新 • • 發佈:2020-11-26
這篇文章主要介紹了Spring關閉Tomcat Servlet容器時記憶體洩漏問題解決方案,文中通過示例程式碼介紹的非常詳細,對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下
出錯資訊
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)
問題分析
servlet容器關閉時發現Quartz定時器執行緒還在執行,對其無所適從,不懂怎麼辦只能強行關閉。
解決思路
在關閉容器時的contextDestroyed事件裡檢測ServletContext裡Quartz相關屬性,找到Bean然後呼叫它的方法結束掉。
解決方法
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; @WebListener public 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("發現quartz定時任務"); 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(); /*logger.info("global setting,rootPath:{}",rootPath); logger.info("deployed on architecture:{},operation System:{},version:{}", System.getProperty("os.arch"), System.getProperty("os.name"), System.getProperty("os.version")); Debugger.dump(); logger.info("app startup completed....");*/ } |
關閉tomcat日誌如下:
其他解決方法
Spring配置檔案
筆者經過實踐,發現在spring配置檔案裡設定引數也可以達到以上效果
<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關閉的時候關閉執行緒
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支援碼農教程。