Log4JInitServlet.java

/*******************************************************************************
 * Copyright (c) 2014, 2015 Scott Clarke (scott@dawg6.com).
 *
 * This file is part of Dawg6's Demon Hunter DPS Calculator.
 *
 * Dawg6's Demon Hunter DPS Calculator 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 3 of the License, or
 * (at your option) any later version.
 *
 * Dawg6's Demon Hunter DPS Calculator 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, see <http://www.gnu.org/licenses/>.
 *******************************************************************************/
package com.dawg6.web.dhcalc.server;

import java.io.File;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.PropertyConfigurator;

public class Log4JInitServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	@Override
	public void init(ServletConfig config) throws ServletException {
		System.out.println("Log4JInitServlet is initializing log4j");
		String log4jLocation = config.getInitParameter("log4j-properties-location");

		ServletContext sc = config.getServletContext();

		if (log4jLocation == null) {
			System.err.println("*** No log4j-properties-location init param, so initializing log4j with BasicConfigurator");
			BasicConfigurator.configure();
		} else {
			String webAppPath = sc.getRealPath("/");
			String log4jProp = webAppPath + log4jLocation;
			File file = new File(log4jProp);
			if (file.exists()) {
				System.out.println("Initializing log4j with: " + log4jProp);
				PropertyConfigurator.configure(log4jProp);
			} else {
				System.err.println("*** " + log4jProp + " file not found, so initializing log4j with BasicConfigurator");
				BasicConfigurator.configure();
			}
		}
		super.init(config);
	}

}