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Spring关闭Tomcat Servlet容器时内存泄漏问题解决方案

2019-10-25 18:07 1986 查看

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<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();
/*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

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

以上就是本文的全部内容,希望对大家的学习有所帮助

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