1 /* 2 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package gc.g1.unloading.classloaders; 24 25 import java.net.MalformedURLException; 26 import java.net.URL; 27 import java.security.CodeSigner; 28 import java.security.CodeSource; 29 30 /** 31 * 32 * This is just a classloader that doesn't follow delegation pattern. 33 * 34 */ 35 public class DoItYourselfClassLoader extends FinalizableClassloader { 36 37 private static long counter = 0; 38 39 /** 40 * We force different classes to have different protection domains 41 */ defineClass(String name, byte[] bytes)42 public Class<?> defineClass(String name, byte[] bytes) { 43 URL url; 44 try { 45 url = new URL("http://random.url.com/" + (counter++)); 46 } catch (MalformedURLException e) { 47 throw new RuntimeException("This is impossible, but there is mistake in simple call to URL constructor", e); 48 } 49 return defineClass(name, bytes, 0, bytes.length, new CodeSource(url, new CodeSigner[] {})); 50 } 51 52 } 53