1 /* 2 * Copyright (c) 2015, 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 */ 24 25 import java.lang.*; 26 import java.lang.reflect.*; 27 import jdk.internal.misc.JavaLangAccess; 28 import jdk.internal.misc.SharedSecrets; 29 30 class EmptyClassHelper { 31 static final JavaLangAccess jla = SharedSecrets.getJavaLangAccess(); 32 static final String USE_APP = "useAppLoader"; 33 public static void main(String[] args) throws Exception { 34 Class cls = null; 35 Method m = null; 36 ClassLoader appLoader = ClassLoader.getSystemClassLoader(); 37 String className = "com.sun.tools.javac.Main"; 38 if (args[0].equals(USE_APP)) { 39 cls = appLoader.loadClass(className); 40 System.out.println("appLoader loaded class"); 41 try { 42 m = cls.getMethod("main", String[].class); 43 System.out.println("appLoader found method main"); 44 } catch(NoSuchMethodException ex) { 45 System.out.println(ex.toString()); 46 } 47 } else { 48 cls = jla.findBootstrapClassOrNull(appLoader, className); 49 System.out.println("bootLoader loaded class"); 50 System.out.println("cls = " + cls); 51 try { 52 m = cls.getMethod("main", String[].class); 53 System.out.println("bootLoader found method main"); 54 } catch(NoSuchMethodException ex) { 55 System.out.println(ex.toString()); 56 } 57 } 58 } 59 }