1/* 2 * Copyright (c) 2017, 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 24import java.io.PrintStream; 25 26/* 27 * Custom system class loader. 28 */ 29public class CustomLoader extends ClassLoader { 30 private static PrintStream out = System.out; 31 public static ClassLoader INSTANCE; 32 33 public CustomLoader(ClassLoader classLoader) { 34 super("CustomSystemLoader", classLoader); 35 assert INSTANCE == null; 36 INSTANCE = this; 37 38 // test cases to validate that ClassLoader::getSystemClassLoader 39 // is not triggered during custom system class loader initialization 40 testEnumValueOf(); 41 } 42 43 static void testEnumValueOf() { 44 TestEnum e = java.lang.Enum.valueOf(TestEnum.class, "C1"); 45 if (e != TestEnum.C1) { 46 throw new RuntimeException("Expected: " + TestEnum.C1 + " got: " + e); 47 } 48 } 49 50 @Override 51 public Class<?> loadClass(String name) throws ClassNotFoundException { 52 out.println("CustomLoader: loading class: " + name); 53 return super.loadClass(name); 54 } 55 56 static enum TestEnum { 57 C1, C2, C3 58 } 59} 60