70 lines
2.3 KiB
Java
70 lines
2.3 KiB
Java
/*
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* Copyright (c) 2014, 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.DataInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.lang.instrument.ClassDefinition;
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import java.lang.instrument.Instrumentation;
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/*
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* This class is present during compilation, but will be deleted before execution.
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*/
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class MyUnresolvedClass {
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static void bar() {
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}
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}
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class MyRedefinedClass {
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static void foo() {
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MyUnresolvedClass.bar();
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}
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}
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public class UnresolvedClassAgent {
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public static void main(String... args) {
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}
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public static void premain(String args, Instrumentation inst) throws Exception {
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try {
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MyRedefinedClass.foo();
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} catch(NoClassDefFoundError err) {
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System.out.println("NoClassDefFoundError (expected)");
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}
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File f = new File(System.getProperty("test.classes"), "MyRedefinedClass.class");
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byte[] buf = new byte[(int)f.length()];
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try (DataInputStream dis = new DataInputStream(new FileInputStream(f))) {
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dis.readFully(buf);
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}
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ClassDefinition cd = new ClassDefinition(MyRedefinedClass.class, buf);
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inst.redefineClasses(new ClassDefinition[] {cd});
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try {
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MyRedefinedClass.foo();
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} catch(NoClassDefFoundError err) {
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System.out.println("NoClassDefFoundError (expected again)");
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}
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}
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}
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