| /* |
| * Copyright (c) 2018, 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. |
| */ |
| |
| /** |
| * @test |
| * @bug 8198393 |
| * @summary Instrumentation.retransformClasses(new Class[0]) should be NOP |
| * @library /test/lib |
| * @modules java.instrument |
| * @compile RetransformClassesZeroLength.java |
| * @run main RetransformClassesZeroLength |
| */ |
| |
| import java.lang.instrument.ClassFileTransformer; |
| import java.lang.instrument.IllegalClassFormatException; |
| import java.lang.instrument.Instrumentation; |
| import java.lang.instrument.UnmodifiableClassException; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.security.ProtectionDomain; |
| |
| import jdk.test.lib.process.ProcessTools; |
| |
| |
| public class RetransformClassesZeroLength { |
| |
| private static String manifest = |
| "Premain-Class: " + RetransformClassesZeroLength.Agent.class.getName() + "\n" |
| + "Can-Retransform-Classes: true\n"; |
| |
| private static String CP = System.getProperty("test.classes"); |
| |
| public static void main(String args[]) throws Throwable { |
| String agentJar = buildAgent(); |
| ProcessTools.executeProcess( |
| ProcessTools.createJavaProcessBuilder( |
| "-javaagent:" + agentJar, |
| "-version") |
| ).shouldHaveExitValue(0); |
| } |
| |
| private static String buildAgent() throws Exception { |
| Path jar = Files.createTempFile(Paths.get("."), null, ".jar"); |
| String jarPath = jar.toAbsolutePath().toString(); |
| ClassFileInstaller.writeJar(jarPath, |
| ClassFileInstaller.Manifest.fromString(manifest), |
| RetransformClassesZeroLength.class.getName()); |
| return jarPath; |
| } |
| |
| |
| public static class Agent implements ClassFileTransformer { |
| public static void premain(String args, Instrumentation inst) { |
| inst.addTransformer(new NoOpTransformer()); |
| try { |
| inst.retransformClasses(new Class[0]); |
| } catch (UnmodifiableClassException ex) { |
| throw new AssertionError(ex); |
| } |
| } |
| } |
| |
| private static class NoOpTransformer implements ClassFileTransformer { |
| @Override |
| public byte[] transform(ClassLoader loader, |
| String className, |
| Class<?> classBeingRedefined, |
| ProtectionDomain protectionDomain, |
| byte[] classfileBuffer |
| ) throws IllegalClassFormatException { |
| return null; // no transform |
| } |
| } |
| } |