Spring关闭Tomcat Servlet容器时内存泄漏问题解决方案

Spring关闭Tomcat Servlet容器时内存泄漏问题解决方案

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;

@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 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();

/*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....");*/

}

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关闭tomcat日志如下：

其他解决方法

Shttp://pring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

可以在web关闭的时候关闭线程

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