| /* |
| * Copyright (c) 2013, 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 8009411 |
| * @summary Test that a static method on an interface doesn't hide a default |
| * method with the same name and signature in a separate compilation |
| * scenario. |
| */ |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.util.concurrent.Callable; |
| |
| import sun.misc.IOUtils; |
| |
| public class StaticInterfaceMethodInWayOfDefault { |
| public interface A_v1 { |
| } |
| |
| public interface A_v2 { |
| default void m() { |
| System.err.println("A.m() called"); |
| } |
| } |
| |
| public interface B extends A_v1 { |
| static void m() { |
| System.err.println("B.m() called"); |
| } |
| } |
| |
| public interface C_v1 extends B { |
| default void m() { |
| System.err.println("C.m() called"); |
| } |
| } |
| |
| public interface C_v2 extends B { |
| } |
| |
| public static class TestTask implements Callable<String> { |
| @Override |
| public String call() { |
| try { |
| Method m = C_v1.class.getMethod("m", (Class<?>[])null); |
| return m.getDeclaringClass().getSimpleName(); |
| } catch (NoSuchMethodException e) { |
| System.err.println("Couldn't find method"); |
| return "ERROR"; |
| } |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| int errors = 0; |
| Callable<String> v1Task = new TestTask(); |
| |
| ClassLoader v2Loader = new V2ClassLoader( |
| StaticInterfaceMethodInWayOfDefault.class.getClassLoader()); |
| Callable<String> v2Task = (Callable<String>) Class.forName( |
| TestTask.class.getName(), |
| true, |
| v2Loader).newInstance(); |
| |
| System.err.println("Running using _v1 classes:"); |
| String res = v1Task.call(); |
| if(!res.equals("C_v1")) { |
| System.err.println("Got wrong method, expecting C_v1, got: " + res); |
| errors++; |
| } |
| |
| System.err.println("Running using _v2 classes:"); |
| res = v2Task.call(); |
| if(!res.equals("A_v1")) { |
| System.err.println("Got wrong method, expecting A_v1, got: " + res); |
| errors++; |
| } |
| |
| if (errors != 0) |
| throw new RuntimeException("Errors found, check log for details"); |
| } |
| |
| /** |
| * A ClassLoader implementation that loads alternative implementations of |
| * classes. If class name ends with "_v1" it locates instead a class with |
| * name ending with "_v2" and loads that class instead. |
| */ |
| static class V2ClassLoader extends ClassLoader { |
| V2ClassLoader(ClassLoader parent) { |
| super(parent); |
| } |
| |
| @Override |
| protected Class<?> loadClass(String name, boolean resolve) |
| throws ClassNotFoundException { |
| if (name.indexOf('.') < 0) { // root package is our class |
| synchronized (getClassLoadingLock(name)) { |
| // First, check if the class has already been loaded |
| Class<?> c = findLoadedClass(name); |
| if (c == null) { |
| c = findClass(name); |
| } |
| if (resolve) { |
| resolveClass(c); |
| } |
| return c; |
| } |
| } |
| else { // not our class |
| return super.loadClass(name, resolve); |
| } |
| } |
| |
| @Override |
| protected Class<?> findClass(String name) |
| throws ClassNotFoundException { |
| // special class name -> replace it with alternative name |
| if (name.endsWith("_v1")) { |
| String altName = name.substring(0, name.length() - 3) + "_v2"; |
| String altPath = altName.replace('.', '/').concat(".class"); |
| try (InputStream is = getResourceAsStream(altPath)) { |
| if (is != null) { |
| byte[] bytes = IOUtils.readFully(is, -1, true); |
| // patch class bytes to contain original name |
| for (int i = 0; i < bytes.length - 2; i++) { |
| if (bytes[i] == '_' && |
| bytes[i + 1] == 'v' && |
| bytes[i + 2] == '2') { |
| bytes[i + 2] = '1'; |
| } |
| } |
| return defineClass(name, bytes, 0, bytes.length); |
| } |
| else { |
| throw new ClassNotFoundException(name); |
| } |
| } |
| catch (IOException e) { |
| throw new ClassNotFoundException(name, e); |
| } |
| } |
| else { // not special class name -> just load the class |
| String path = name.replace('.', '/').concat(".class"); |
| try (InputStream is = getResourceAsStream(path)) { |
| if (is != null) { |
| byte[] bytes = IOUtils.readFully(is, -1, true); |
| return defineClass(name, bytes, 0, bytes.length); |
| } |
| else { |
| throw new ClassNotFoundException(name); |
| } |
| } |
| catch (IOException e) { |
| throw new ClassNotFoundException(name, e); |
| } |
| } |
| } |
| } |
| } |