tomcat重启警告：Abandoned connection cleanup thread)

最新推荐文章于 2023-06-05 13:25:21 发布

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在Tomcat服务器重启时遇到了'Abandoned connection cleanup thread'警告。为解决此问题，可以在web.xml中添加监听器，并实现自定义的ContextFinalizer类，在Tomcat重启时手动结束MySQL连接。

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tomcat重启警告：Abandoned connection cleanup thread)

报错信息


The web application [HelloWeb] appears to have started a thread named [Abandoned connection cleanup thread] 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)
		 java.lang.ref.ReferenceQueue.remove(Unknown Source)
		 com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)

解决方法

web.xml中加一个监听器；

<listener>
		<listener-class>com.ls.utils.ContextFinalizer</listener-class>
</listener>

新建一个ContextFinalizer，在tomcat重启的时候，手动杀掉mysql的进程，类如下：

/**
 * 
 */
/**
 * @author cdy
 *
 */
package com.ls.utils;

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.annotation.WebListener;

import com.mysql.jdbc.AbandonedConnectionCleanupThread;

@WebListener
public class ContextFinalizer implements ServletContextListener {

	public void contextInitialized(ServletContextEvent sce) {
	}

	public void contextDestroyed(ServletContextEvent sce) {
		Enumeration<Driver> drivers = DriverManager.getDrivers();
		Driver d = null;
		while (drivers.hasMoreElements()) {
			try {
				d = drivers.nextElement();
				DriverManager.deregisterDriver(d);
				System.out.println(String.format("ContextFinalizer:Driver %s deregistered", d));
			} catch (SQLException ex) {
				System.out.println(String.format("ContextFinalizer:Error deregistering driver %s", d) + ":" + ex);
			}
		}
		try {
			AbandonedConnectionCleanupThread.shutdown();
		} catch (InterruptedException e) {
			System.out.println("ContextFinalizer:SEVERE problem cleaning up: " + e.getMessage());
			e.printStackTrace();
		}
	}
}

参考：https://blog.youkuaiyun.com/qq_35205367/article/details/84984413

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