Main.java

/**
 * Copyright (c) 2002-2011 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.management;

import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;

class Main
{
    private static final String JCONSOLE = "sun.tools.jconsole.JConsole";

    private Main()
    {
    }

    public static void main( String[] args ) throws Throwable
    {
        Throwable failure = null;
        Class<?> jconsole = null;
        try
        {
            jconsole = Class.forName( JCONSOLE );
        }
        catch ( ClassNotFoundException ex )
        {
            ClassLoader loader;
            try
            {
                loader = new URLClassLoader(
                        new URL[] { new File( new File( System.getProperty( "java.home" ), "lib" ),
                                "jconsole.jar" ).toURI().toURL() }, Main.class.getClassLoader() );
            }
            catch ( MalformedURLException e )
            {
                System.err.println( "Could not find jconsole.jar" );
                return;
            }
            try
            {
                jconsole = loader.loadClass( JCONSOLE );
            }
            catch ( ClassNotFoundException e )
            {
                failure = ex;
            }
        }
        Method main = null;
        if ( jconsole != null )
        {
            try
            {
                main = jconsole.getMethod( "main", String[].class );
            }
            catch ( Exception ex )
            {
                failure = ex;
            }
        }
        if ( main != null )
        {
            try
            {
                main.invoke( null, new Object[] { args } );
                return;
            }
            catch ( InvocationTargetException e )
            {
                throw e.getTargetException();
            }
            catch ( Exception ex )
            {
                failure = ex;
            }
        }
        if ( failure != null )
        {
            System.err.println( "Failed to launch jconsole: " + failure );
            if ( !( failure instanceof ClassNotFoundException ) )
            {
                failure.printStackTrace();
            }
        }
    }
}