| /* |
| * Copyright (c) 2005, 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. |
| */ |
| |
| /* |
| * |
| * |
| * Unit test for Instrumentation appendToSystemClassLoaderSearch. This |
| * test does the following: |
| * |
| * 1. Creates a class loader to load class Foo. Execute Foo.doSomething |
| * which references a missing class Bar. The doSomething method |
| * should fail with NoClassDefFoundError. |
| * |
| * 2. Add Bar.jar to the system class path. Bar.jar contains Bar. |
| * |
| * 3. Create another class loader to load Foo. Execute Foo.doSomething. |
| * doSomething will load Bar. |
| * |
| * 4. Re-execute the first Foo's doSomething - it should fail a second |
| * time because the attempt to resolve Bar must fail with the same |
| * error as the first attempt. |
| * |
| * 5. De-reference both class loaders and execute System.gc(). We can't |
| * assert that the Foo classes will be unloaded but it serves to |
| * exercise the unload code path in HotSpot. |
| */ |
| import java.lang.instrument.Instrumentation; |
| import java.io.File; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.InvocationTargetException; |
| import java.util.jar.JarFile; |
| |
| public class ClassUnloadTest { |
| |
| static Instrumentation ins; |
| |
| public static void main(String args[]) throws Exception { |
| String dir = args[0] + File.separator; |
| String jar = dir + args[1]; |
| |
| System.out.println(jar); |
| |
| URL u = (new File(dir)).toURL(); |
| URL urls[] = { u }; |
| |
| // This should fail as Bar is not available |
| Invoker i1 = new Invoker(urls, "Foo", "doSomething"); |
| Boolean result = (Boolean)i1.invoke((Object)null); |
| if (result.booleanValue()) { |
| throw new RuntimeException("Test configuration error - doSomething should not succeed"); |
| } |
| |
| // put Bar on the system class path |
| ins.appendToSystemClassLoaderSearch( new JarFile(jar) ); |
| |
| // This should fail even though Bar is now available |
| result = (Boolean)i1.invoke((Object)null); |
| if (result.booleanValue()) { |
| throw new RuntimeException("Test configuration error - doSomething should not succeed"); |
| } |
| |
| // This should succeed because this is a different Foo |
| Invoker i2 = new Invoker(urls, "Foo", "doSomething"); |
| result = (Boolean)i2.invoke((Object)null); |
| if (!result.booleanValue()) { |
| throw new RuntimeException("Test configuration error - doSomething did not succeed"); |
| } |
| |
| // Exercise some class unloading |
| i1 = i2 = null; |
| System.gc(); |
| } |
| |
| static class Invoker { |
| |
| URLClassLoader cl; |
| Method m; |
| |
| public Invoker(URL urls[], String cn, String mn, Class ... params) |
| throws ClassNotFoundException, NoSuchMethodException |
| { |
| cl = new URLClassLoader(urls); |
| Class c = Class.forName("Foo", true, cl); |
| m = c.getDeclaredMethod(mn, params); |
| } |
| |
| public Object invoke(Object ... args) |
| throws IllegalAccessException, InvocationTargetException |
| { |
| return m.invoke(args); |
| } |
| } |
| |
| public static void premain(String args, Instrumentation i) { |
| ins = i; |
| } |
| } |