98 lines
3.5 KiB
Java
98 lines
3.5 KiB
Java
/*
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* Copyright (c) 2020, 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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import java.beans.IntrospectionException;
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import java.beans.Introspector;
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import java.lang.ref.Reference;
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import java.lang.ref.WeakReference;
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import java.net.URL;
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import java.net.URLClassLoader;
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/**
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* @test
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* @bug 8231454
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* @summary Tests cache cleanup by the Introspector.flushXXX()
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*/
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public final class FlushClassInfoCache {
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public static void main(String[] args) throws Exception {
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verify(getLoader("testClass"));
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verify(getLoader("testAll"));
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Reference<ClassLoader> loader = getLoader("test");
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// Clear the cache in com.sun.beans.introspect.ClassInfo::CACHE
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Introspector.flushCaches();
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verify(loader);
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}
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private static void verify(Reference<?> loader) throws Exception {
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int attempt = 0;
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while (loader.get() != null) {
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if (++attempt > 10) {
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throw new RuntimeException("Too many attempts: " + attempt);
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}
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// Cannot generate OOM here, it will clear the CACHE as well
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System.gc();
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Thread.sleep(1000);
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System.out.println("Not freed :(");
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}
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}
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public static void test() {
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try {
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Introspector.getBeanInfo(FlushClassInfoCache.class);
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} catch (IntrospectionException e) {
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throw new RuntimeException(e);
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}
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}
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public static void testClass() {
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try {
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Introspector.getBeanInfo(FlushClassInfoCache.class);
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// Clear the cache in com.sun.beans.introspect.ClassInfo::CACHE
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Introspector.flushFromCaches(FlushClassInfoCache.class);
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} catch (IntrospectionException e) {
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throw new RuntimeException(e);
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}
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}
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public static void testAll() {
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try {
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Introspector.getBeanInfo(FlushClassInfoCache.class);
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// Clear the cache in com.sun.beans.introspect.ClassInfo::CACHE
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Introspector.flushCaches();
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} catch (IntrospectionException e) {
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throw new RuntimeException(e);
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}
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}
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private static Reference<ClassLoader> getLoader(String m) throws Exception {
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URL url = FlushClassInfoCache.class.getProtectionDomain()
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.getCodeSource().getLocation();
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URLClassLoader loader = new URLClassLoader(new URL[]{url}, null);
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Class<?> cls = Class.forName("FlushClassInfoCache", true, loader);
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cls.getDeclaredMethod(m).invoke(null);
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loader.close();
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return new WeakReference<>(loader);
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}
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}
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