aoqi@0: /*
aoqi@0:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: import java.io.DataInputStream;
aoqi@0: import java.io.File;
aoqi@0: import java.io.FileInputStream;
aoqi@0: import java.lang.instrument.ClassDefinition;
aoqi@0: import java.lang.instrument.Instrumentation;
aoqi@0: 
aoqi@0: /*
aoqi@0:  * This class is present during compilation, but will be deleted before execution.
aoqi@0:  */
aoqi@0: class MyUnresolvedClass {
aoqi@0:     static void bar() {
aoqi@0:     }
aoqi@0: }
aoqi@0: 
aoqi@0: class MyRedefinedClass {
aoqi@0:     static void foo() {
aoqi@0:         MyUnresolvedClass.bar();
aoqi@0:     }
aoqi@0: }
aoqi@0: 
aoqi@0: public class UnresolvedClassAgent {
aoqi@0:     public static void main(String... args) {
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static void premain(String args, Instrumentation inst) throws Exception {
aoqi@0:         try {
aoqi@0:             MyRedefinedClass.foo();
aoqi@0:         } catch(NoClassDefFoundError err) {
aoqi@0:             System.out.println("NoClassDefFoundError (expected)");
aoqi@0:         }
aoqi@0: 
aoqi@0:         File f = new File(System.getProperty("test.classes"), "MyRedefinedClass.class");
aoqi@0:         byte[] buf = new byte[(int)f.length()];
aoqi@0:         try (DataInputStream dis = new DataInputStream(new FileInputStream(f))) {
aoqi@0:             dis.readFully(buf);
aoqi@0:         }
aoqi@0:         ClassDefinition cd = new ClassDefinition(MyRedefinedClass.class, buf);
aoqi@0:         inst.redefineClasses(new ClassDefinition[] {cd});
aoqi@0: 
aoqi@0:         try {
aoqi@0:             MyRedefinedClass.foo();
aoqi@0:         } catch(NoClassDefFoundError err) {
aoqi@0:             System.out.println("NoClassDefFoundError (expected again)");
aoqi@0:         }
aoqi@0:     }
aoqi@0: }