The web application [] appears to have started a thread named [Abandoned connection cleanup thread] com.mysql.jdbc.AbandonedConnectionCleanupThread

01-Jul-2016 14:25:30.937 WARNING [localhost-startStop-1] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] 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(ReferenceQueue.java:143)
com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)

解决方式：

package reyo.sdk.utils.mysql;

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();
}
}
}