001 /* 002 * Copyright (C) 2008-2010 by Holger Arndt 003 * 004 * This file is part of the Universal Java Matrix Package (UJMP). 005 * See the NOTICE file distributed with this work for additional 006 * information regarding copyright ownership and licensing. 007 * 008 * UJMP is free software; you can redistribute it and/or modify 009 * it under the terms of the GNU Lesser General Public License as 010 * published by the Free Software Foundation; either version 2 011 * of the License, or (at your option) any later version. 012 * 013 * UJMP is distributed in the hope that it will be useful, 014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 016 * GNU Lesser General Public License for more details. 017 * 018 * You should have received a copy of the GNU Lesser General Public 019 * License along with UJMP; if not, write to the 020 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, 021 * Boston, MA 02110-1301 USA 022 */ 023 024 package org.ujmp.core.util; 025 026 import java.io.File; 027 import java.io.IOException; 028 import java.lang.reflect.Method; 029 import java.net.URL; 030 import java.net.URLClassLoader; 031 032 // found at http://forum.java.sun.com/thread.jspa?threadID=300557 033 034 public class ClassPathHacker { 035 036 private static final Class<?>[] parameters = new Class[] { URL.class }; 037 038 public static void addFile(String s) throws IOException { 039 File f = new File(s); 040 addFile(f); 041 } 042 043 public static void addFile(File f) throws IOException { 044 addURL(f.toURI().toURL()); 045 } 046 047 public static void addURL(URL u) throws IOException { 048 049 URLClassLoader sysloader = (URLClassLoader) ClassLoader.getSystemClassLoader(); 050 Class<URLClassLoader> sysclass = URLClassLoader.class; 051 052 try { 053 Method method = sysclass.getDeclaredMethod("addURL", parameters); 054 method.setAccessible(true); 055 method.invoke(sysloader, new Object[] { u }); 056 } catch (Throwable t) { 057 t.printStackTrace(); 058 throw new IOException("Error, could not add URL to system classloader"); 059 } 060 061 } 062 063 }