net.longfalcon.web.listener.ContextListener.java Source code

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Here is the source code for net.longfalcon.web.listener.ContextListener.java

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/*
 * Copyright (c) 2016. Sten Martinez
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

package net.longfalcon.web.listener;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

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

/**
 * User: Sten Martinez
 * Date: 3/29/16
 * Time: 12:44 PM
 */
public class ContextListener implements ServletContextListener {
    private static final Log _log = LogFactory.getLog(ContextListener.class);

    @Override
    public void contextInitialized(ServletContextEvent servletContextEvent) {

    }

    @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        // Thanks StackOverflow
        // This manually deregisters JDBC driver, which prevents Tomcat 7 from complaining about memory leaks wrto this class
        Enumeration<Driver> 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.error(String.format("Error deregistering driver %s", driver), e);
            }

        }
    }
}