09-Aug-2020 01:18:00.659 INFO [mysql-cj-abandoned-connection-cleanup] org.apache.catalina.loader.WebappClassLoader.findResourceInternal Illegal access: this web application instance has been stopped already. Could not load . The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.

mysql-cj-abandoned-connection-cleanup

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学习ssm整合的时候一直在TOMCAT的日志中报出这个警告，虽然不影响，但是5秒就重复弹出来还是挺烦的。上百度上查找，答案寥寥无几最后在CSDN上找到了答案，要创建一个web监听类，主要是关闭数据库的连接。

package com.ssm.listener;

import com.mysql.cj.jdbc.AbandonedConnectionCleanupThread;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Enumeration;

//修复DBCP的BUG，https://issues.apache.org/jira/browse/DBCP-332
public class MyServletContextListener implements ServletContextListener{

    public void contextInitialized(ServletContextEvent servletContextEvent) {

    }

    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        //这里如果Web应用拥有多个数据库的连接，可以一并关闭
        Enumeration<Driver> drivers = DriverManager.getDrivers();
        Driver driver = null;
        while (drivers.hasMoreElements()) {
            try {
                driver = drivers.nextElement();
                DriverManager.deregisterDriver(driver);
            } catch (SQLException ex) {
            }
        }
        AbandonedConnectionCleanupThread.checkedShutdown();
    }
}

最后在web.xml中注册该类：

<listener>
    <listener-class>com.ssm.listener.MyServletContextListener</listener-class>
</listener>

解决方法来自文章：link