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SSM整合小项目关闭时tomcat报错：
The web application [] 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
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原因似乎是数据库的驱动无法释放。
解决方法：

• pom.xml中的mysql驱动依赖去掉。
• 将mysql驱动包添加到tomcat安装目录下的lib文件夹中。
• 自定义监听器：

public class DriverMangerListener implements ServletContextListener {

    @Override
    public void contextInitialized(ServletContextEvent sce) {

    }

    public void contextDestroyed(ServletContextEvent sce) {
        Enumeration<Driver> enumeration = DriverManager.getDrivers();
        while (enumeration.hasMoreElements()) {
            try {
                DriverManager.deregisterDriver(enumeration.nextElement());
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

• 将该监听器在web.xml中配置：

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

• ok。
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The web application [] 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