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