1/*
2 * Copyright (c) 2014, 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
24import java.io.DataInputStream;
25import java.io.File;
26import java.io.FileInputStream;
27import java.lang.instrument.ClassDefinition;
28import java.lang.instrument.Instrumentation;
29
30/*
31 * This class is present during compilation, but will be deleted before execution.
32 */
33class MyUnresolvedClass {
34    static void bar() {
35    }
36}
37
38class MyRedefinedClass {
39    static void foo() {
40        MyUnresolvedClass.bar();
41    }
42}
43
44public class UnresolvedClassAgent {
45    public static void main(String... args) {
46    }
47
48    public static void premain(String args, Instrumentation inst) throws Exception {
49        try {
50            MyRedefinedClass.foo();
51        } catch(NoClassDefFoundError err) {
52            System.out.println("NoClassDefFoundError (expected)");
53        }
54
55        File f = new File(System.getProperty("test.classes"), "MyRedefinedClass.class");
56        byte[] buf = new byte[(int)f.length()];
57        try (DataInputStream dis = new DataInputStream(new FileInputStream(f))) {
58            dis.readFully(buf);
59        }
60        ClassDefinition cd = new ClassDefinition(MyRedefinedClass.class, buf);
61        inst.redefineClasses(new ClassDefinition[] {cd});
62
63        try {
64            MyRedefinedClass.foo();
65        } catch(NoClassDefFoundError err) {
66            System.out.println("NoClassDefFoundError (expected again)");
67        }
68    }
69}
70