这篇文章主要介绍如何解决Spring关闭Tomcat Servlet容器时内存泄漏的问题，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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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....");*/
}
| 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
