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 25 import java.lang.*; 26 27 import java.lang.reflect.Method; 28 import jdk.internal.access.JavaLangAccess; 29 import jdk.internal.access.SharedSecrets; 30 31 class EmptyClassHelper { 32 static final JavaLangAccess jla = SharedSecrets.getJavaLangAccess(); 33 static final String USE_APP = "useAppLoader"; 34 public static void main(String[] args) throws Exception { 35 Class cls = null; 36 Method m = null; 37 ClassLoader appLoader = ClassLoader.getSystemClassLoader(); 38 String className = "com.sun.tools.javac.Main"; 39 if (args[0].equals(USE_APP)) { 40 cls = appLoader.loadClass(className); 41 System.out.println("appLoader loaded class"); 42 try { 43 m = cls.getMethod("main", String[].class); 44 System.out.println("appLoader found method main"); 45 } catch(NoSuchMethodException ex) { 46 System.out.println(ex.toString()); 47 } 48 } else { 49 cls = jla.findBootstrapClassOrNull(appLoader, className); 50 System.out.println("bootLoader loaded class"); 51 System.out.println("cls = " + cls); 52 try { 53 m = cls.getMethod("main", String[].class); 54 System.out.println("bootLoader found method main"); 55 } catch(NoSuchMethodException ex) { 56 System.out.println(ex.toString()); 57 } 58 } 59 } 60 }