Tomcat 关闭的时候出现 JDBC 驱动的警告

[h2so4]

The web application [ROOT] registered the JDBC driver [com.mysql.jdbc.Driver] 

but failed to unregister it when the web application was stopped. 

To prevent a memory leak, the JDBC Driver has been forcibly unregistered.

应用程序跑的没问题，但是强制解除注册了？用的 mybatis，是要我手动解除么？

[ixiaohei]

这个是 tomcat 关闭时候检查内存泄漏的提示，不用管就行了

[h2so4]

@ixiaohei 他上面显示的是警告选项，和我的 webapp 代码无关的？

[Jerry09]

你推出之后看进程管理里面有没有 Java 内存泄漏了应该是

[honeycomb]

有些很旧的 JDBC 驱动会有关不掉的问题

[tianshuang]

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

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


public class AppServletContextListener implements ServletContextListener {

private static final Logger logger = LogManager.getLogger();

@Override
public void contextInitialized(ServletContextEvent sce) {

}

@Override
public void contextDestroyed(ServletContextEvent sce) {

// This manually deregisters JDBC driver, which prevents Tomcat from complaining about memory leaks to this class
Enumeration<Driver> drivers = DriverManager.getDrivers();
while (drivers.hasMoreElements()) {
Driver driver = drivers.nextElement();
try {
DriverManager.deregisterDriver(driver);
logger.log(Level.INFO, String.format("deregistering jdbc driver: %s", driver));
} catch (SQLException e) {
logger.log(Level.ERROR, String.format("Error deregistering driver %s", driver), e);
}
}

}
}

[h2so4]

@honeycomb 5.1.6 版本不低吧