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/*
* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.nio.file.Files;
import java.security.AllPermission;
import java.security.Permissions;
import java.security.ProtectionDomain;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* A custom ClassLoader to load the concrete LoggerFinder class
* with all permissions. The CustomSystemClassLoader class must be
* in the BCL, otherwise when system classes - such as
* ZoneDateTime try to load their resource bundle a MissingResourceBundle
* caused by a SecurityException may be thrown, as the CustomSystemClassLoader
* code base will be found in the stack called by doPrivileged.
*
* @author danielfuchs
*/
public class CustomSystemClassLoader extends ClassLoader {
final List<String> finderClassNames =
Arrays.asList("LoggerFinderLoaderTest$BaseLoggerFinder",
"LoggerFinderLoaderTest$BaseLoggerFinder2");
final Map<String, Class<?>> finderClasses = new HashMap<>();
Class<?> testLoggerFinderClass;
public CustomSystemClassLoader() {
super();
}
public CustomSystemClassLoader(ClassLoader parent) {
super(parent);
}
private Class<?> defineFinderClass(String name)
throws ClassNotFoundException {
final Object obj = getClassLoadingLock(name);
synchronized(obj) {
if (finderClasses.get(name) != null) return finderClasses.get(name);
if (testLoggerFinderClass == null) {
// Hack: we load testLoggerFinderClass to get its code source.
// we can't use this.getClass() since we are in the boot.
testLoggerFinderClass = super.loadClass("LoggerFinderLoaderTest$TestLoggerFinder");
}
URL url = testLoggerFinderClass.getProtectionDomain().getCodeSource().getLocation();
File file = new File(url.getPath(), name+".class");
if (file.canRead()) {
try {
byte[] b = Files.readAllBytes(file.toPath());
Permissions perms = new Permissions();
perms.add(new AllPermission());
Class<?> finderClass = defineClass(
name, b, 0, b.length, new ProtectionDomain(
this.getClass().getProtectionDomain().getCodeSource(),
perms));
System.out.println("Loaded " + name);
finderClasses.put(name, finderClass);
return finderClass;
} catch (Throwable ex) {
ex.printStackTrace();
throw new ClassNotFoundException(name, ex);
}
} else {
throw new ClassNotFoundException(name,
new IOException(file.toPath() + ": can't read"));
}
}
}
@Override
public synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
if (finderClassNames.contains(name)) {
Class<?> c = defineFinderClass(name);
if (resolve) {
resolveClass(c);
}
return c;
}
return super.loadClass(name, resolve);
}
@Override
protected Class<?> findClass(String name) throws ClassNotFoundException {
if (finderClassNames.contains(name)) {
return defineFinderClass(name);
}
return super.findClass(name);
}
}
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