86 lines
3.5 KiB
Java
86 lines
3.5 KiB
Java
/*
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* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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import java.io.File;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.security.ProtectionDomain;
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public class ClassListWithCustomClassNoSource {
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private static byte[] helloBytes;
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private static final String HELLO = "Hello";
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static class CL extends ClassLoader {
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private ProtectionDomain pd;
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public CL(String name, ClassLoader parent, ProtectionDomain protD) {
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super(name, parent);
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pd = protD;
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}
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@Override
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protected Class<?> findClass(String name) throws ClassNotFoundException {
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if (pd == null) {
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pd = new ProtectionDomain(null, null);
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}
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return defineClass(name, helloBytes, 0, helloBytes.length, pd);
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}
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}
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public static void main(String[] args) throws Exception {
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if (args.length != 1) {
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throw new RuntimeException("Invalid arg, Use 1, 2, or 3");
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}
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ClassLoader thisLoader = ClassListWithCustomClassNoSource.class.getClassLoader();
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helloBytes = thisLoader.getResourceAsStream(HELLO + ".class").readAllBytes();
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switch(args[0]) {
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case "1":
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Class<?> cls1 = (new CL("HelloLoader", null, null)).loadClass(HELLO);
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System.out.println(HELLO + " was successfully loaded by " + cls1.getClassLoader().getName());
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break;
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case "2":
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ProtectionDomain p = ClassListWithCustomClassNoSource.class.getProtectionDomain();
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Class<?> cls2 = (new CL("HelloLoader", null, p)).loadClass(HELLO);
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System.out.println(HELLO + " was successfully loaded by " + cls2.getClassLoader().getName());
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break;
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case "3":
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URL url = ClassListWithCustomClassNoSource.class.getProtectionDomain().getCodeSource().getLocation();
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URLClassLoader urlLoader = new URLClassLoader("HelloClassLoader", new URL[] {url}, null);
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Class<?> cls = urlLoader.loadClass(HELLO);
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if (cls != null) {
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System.out.println(HELLO + " was loaded by " + cls.getClassLoader().getName());
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if (urlLoader != cls.getClassLoader()) {
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System.out.println(HELLO + " was not loaded by " + urlLoader.getName());
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}
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} else {
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System.out.println(HELLO + " is not loaded");
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}
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break;
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default:
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throw new RuntimeException("Should have one argument, 1, 2 or 3");
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}
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}
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}
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