1 /* 2 * Copyright (c) 2015, 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 24 import java.io.File; 25 import java.io.IOException; 26 import java.net.URL; 27 import java.nio.file.Files; 28 import java.security.AllPermission; 29 import java.security.Permissions; 30 import java.security.ProtectionDomain; 31 import java.util.Arrays; 32 import java.util.HashMap; 33 import java.util.List; 34 import java.util.Map; 35 import java.util.concurrent.ConcurrentHashMap; 36 37 38 /** 39 * A custom ClassLoader to load the concrete LoggerFinder class 40 * with all permissions. The CustomSystemClassLoader class must be 41 * in the BCL, otherwise when system classes - such as 42 * ZoneDateTime try to load their resource bundle a MissingResourceBundle 43 * caused by a SecurityException may be thrown, as the CustomSystemClassLoader 44 * code base will be found in the stack called by doPrivileged. 45 * 46 * @author danielfuchs 47 */ 48 public class CustomSystemClassLoader extends ClassLoader { 49 50 51 final List<String> finderClassNames = 52 Arrays.asList("BaseLoggerFinder"); 53 final Map<String, Class<?>> finderClasses = new ConcurrentHashMap<>(); 54 Class<?> testLoggerFinderClass; 55 56 public CustomSystemClassLoader() { 57 super(); 58 } 59 public CustomSystemClassLoader(ClassLoader parent) { 60 super(parent); 61 } 62 63 private Class<?> defineFinderClass(String name) 64 throws ClassNotFoundException { 65 Class<?> finderClass = finderClasses.get(name); 66 if (finderClass != null) return finderClass; 67 68 final Object obj = getClassLoadingLock(name); 69 synchronized(obj) { 70 finderClasses.get(name); 71 if (finderClass != null) return finderClass; 72 73 if (testLoggerFinderClass == null) { 74 // Hack: we load testLoggerFinderClass to get its code source. 75 // we can't use this.getClass() since we are in the boot. 76 testLoggerFinderClass = super.loadClass("BaseDefaultLoggerFinderTest$TestLoggerFinder"); 77 } 78 URL url = testLoggerFinderClass.getProtectionDomain().getCodeSource().getLocation(); 79 File file = new File(url.getPath(), name+".class"); 80 if (file.canRead()) { 81 try { 82 byte[] b = Files.readAllBytes(file.toPath()); 83 Permissions perms = new Permissions(); 84 perms.add(new AllPermission()); 85 finderClass = defineClass( 86 name, b, 0, b.length, new ProtectionDomain( 87 this.getClass().getProtectionDomain().getCodeSource(), 88 perms)); 89 System.out.println("Loaded " + name); 90 finderClasses.put(name, finderClass); 91 return finderClass; 92 } catch (Throwable ex) { 93 ex.printStackTrace(); 94 throw new ClassNotFoundException(name, ex); 95 } 96 } else { 97 throw new ClassNotFoundException(name, 98 new IOException(file.toPath() + ": can't read")); 99 } 100 } 101 } 102 103 private static boolean matches(String prefix, String name) { 104 return prefix.equals(name) || name.startsWith(prefix + "$"); 105 } 106 107 @Override 108 public synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { 109 if (finderClassNames.stream().anyMatch(n -> matches(n, name))) { 110 Class<?> c = defineFinderClass(name); 111 if (resolve) { 112 resolveClass(c); 113 } 114 return c; 115 } 116 return super.loadClass(name, resolve); 117 } 118 119 @Override 120 protected Class<?> findClass(String name) throws ClassNotFoundException { 121 if (finderClassNames.stream().anyMatch(n -> matches(n, name))) { 122 return defineFinderClass(name); 123 } 124 return super.findClass(name); 125 } 126 127 }