WebApp.java

/*
 * Copyright (c) 2013, Francis Galiegue <fgaliegue@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Lesser GNU General Public License as
 * published by the Free Software Foundation, either version 3 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
 * Lesser 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.github.fge.jsonschema.misc;

import com.google.common.base.Strings;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.webapp.WebAppContext;

/**
 * This class launches the web application in an embedded Jetty container.
 * This is the entry point to your application. The Java command that is used for
 * launching should fire this main method.
 */
public final class WebApp
{
    private WebApp()
    {
    }

    public static void main(final String... args)
        throws Exception
    {
        final String webappDirLocation = "src/main/webapp/";

        //The port that we should run on can be set into an environment variable
        //Look for that variable and default to 8080 if it isn't there.
        String webPort = System.getenv("PORT");
        if (Strings.isNullOrEmpty(webPort))
            webPort = "8080";

        final Server server = new Server(Integer.valueOf(webPort));
        final WebAppContext root = new WebAppContext();

        root.setContextPath("/");
        root.setDescriptor(webappDirLocation + "/WEB-INF/web.xml");
        root.setResourceBase(webappDirLocation);

        //Parent loader priority is a class loader setting that Jetty accepts.
        //By default Jetty will behave like most web containers in that it will
        //allow your application to replace non-server libraries that are part of the
        //container. Setting parent loader priority to true changes this behavior.
        //Read more here: http://wiki.eclipse.org/Jetty/Reference/Jetty_Classloading
        root.setParentLoaderPriority(true);

        server.setHandler(root);

        server.start();
        server.join();
    }
}