Solved two mysql+tomcat problems

Solved two mysql+tomcat problems:

1. The web application registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web.
2. The web application appears to have started a thread named [MySQL Statement Cancellation Timer] but has failed.

1. The web application registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web.

PROBLEM:

org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [/rest] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web

SOLUTION:
http://stackoverflow.com/questions/3320400/jdbc-driver-unregisted-when-the-web-application-stops

import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Enumeration;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class JdbcListener implements ServletContextListener
{
 private static final Logger LOG = Logger.getLogger(JdbcListener.class);

 public void contextDestroyed(ServletContextEvent sce)
 {
    deregisterJdbcDriver();
 }

 public void contextInitialized(ServletContextEvent sce)
 {

 }

 private void deregisterJdbcDriver()
 {
    // This manually deregisters JDBC driver, which prevents Tomcat 7 from complaining about memory leaks
    Enumeration drivers = DriverManager.getDrivers();
    while (drivers.hasMoreElements())
    {
       Driver driver = drivers.nextElement();
       try
       {
          DriverManager.deregisterDriver(driver);
          LOG.info(String.format("Deregistering jdbc driver: %s", driver));
       }
       catch (SQLException e)
       {
          LOG.info(String.format("Error deregistering driver %s", driver), e);
       }
    }
 }

}

2. The web application appears to have started a thread named [MySQL Statement Cancellation Timer] but has failed.

PROBLEM:

org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
SEVERE: The web application [/rest] appears to have started a thread named [MySQL Statement Cancellation Timer] but has failed

SOLUTION:
http://bugs.mysql.com/bug.php?id=36565
To upgrage mysql connector jar.
http://dev.mysql.com/downloads/connector/j/

     
       mysql
       mysql-connector-java
       5.1.17