68 lines
2.6 KiB
Java
68 lines
2.6 KiB
Java
/*
|
|
* Copyright (c) 2024, 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;
|
|
|
|
public class RedefineOldSuperApp {
|
|
public static void main(String args[]) throws Throwable {
|
|
File bootJar = new File(args[0]);
|
|
ClassLoader appClassLoader = ClassLoader.getSystemClassLoader();
|
|
|
|
Class<?> superCls = Class.forName("OldSuper", false, appClassLoader);
|
|
System.out.println("OldSuper>> loader = " + superCls.getClassLoader());
|
|
|
|
{
|
|
OldSuper obj = (OldSuper)superCls.newInstance();
|
|
System.out.println("(before transform) OldSuper>> doit() = " + obj.doit());
|
|
}
|
|
|
|
// Redefine the class
|
|
byte[] bytes = Util.getClassFileFromJar(bootJar, "OldSuper");
|
|
Util.replace(bytes, "Hello", "HELLO");
|
|
RedefineClassHelper.redefineClass(superCls, bytes);
|
|
|
|
{
|
|
OldSuper obj = (OldSuper)superCls.newInstance();
|
|
String s = obj.doit();
|
|
System.out.println("(after transform) OldSuper>> doit() = " + s);
|
|
if (!s.equals("HELLO")) {
|
|
throw new RuntimeException("OldSuper doit() should be HELLO but got " + s);
|
|
}
|
|
}
|
|
|
|
Class<?> childCls = Class.forName("NewChild", false, appClassLoader);
|
|
System.out.println("NewChild>> loader = " + childCls.getClassLoader());
|
|
|
|
|
|
{
|
|
OldSuper obj = (OldSuper)childCls.newInstance();
|
|
String s = obj.doit();
|
|
System.out.println("(after transform) NewChild>> doit() = " + s);
|
|
if (!s.equals("HELLO")) {
|
|
throw new RuntimeException("NewChild doit() should be HELLO but got " + s);
|
|
}
|
|
}
|
|
}
|
|
}
|