102 lines
3.5 KiB
Java
102 lines
3.5 KiB
Java
/*
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* Copyright (c) 2015, 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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import java.io.File;
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import java.io.IOException;
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import java.net.URL;
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import java.nio.file.Files;
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import java.security.AllPermission;
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import java.security.Permissions;
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import java.security.ProtectionDomain;
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/**
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* A custom ClassLoader to load the concrete LoggerFinder class
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* with all permissions.
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*
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* @author danielfuchs
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*/
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public class CustomSystemClassLoader extends ClassLoader {
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Class<?> finderClass = null;
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public CustomSystemClassLoader() {
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super();
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}
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public CustomSystemClassLoader(ClassLoader parent) {
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super(parent);
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}
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private Class<?> defineFinderClass(String name)
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throws ClassNotFoundException {
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final Object obj = getClassLoadingLock(name);
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synchronized(obj) {
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if (finderClass != null) return finderClass;
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URL url = this.getClass().getProtectionDomain().getCodeSource().getLocation();
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File file = new File(url.getPath(), name+".class");
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if (file.canRead()) {
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try {
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byte[] b = Files.readAllBytes(file.toPath());
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Permissions perms = new Permissions();
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perms.add(new AllPermission());
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finderClass = defineClass(
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name, b, 0, b.length, new ProtectionDomain(
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this.getClass().getProtectionDomain().getCodeSource(),
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perms));
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System.out.println("Loaded " + name);
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return finderClass;
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} catch (Throwable ex) {
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ex.printStackTrace();
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throw new ClassNotFoundException(name, ex);
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}
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} else {
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throw new ClassNotFoundException(name,
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new IOException(file.toPath() + ": can't read"));
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}
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}
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}
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@Override
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public synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
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if (name.equals("BaseLoggerFinder")) {
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Class<?> c = defineFinderClass(name);
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if (resolve) {
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resolveClass(c);
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}
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return c;
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}
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return super.loadClass(name, resolve);
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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 (name.equals("BaseLoggerFinder")) {
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return defineFinderClass(name);
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}
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return super.findClass(name);
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}
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}
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