86 lines
3.0 KiB
Java
86 lines
3.0 KiB
Java
/*
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* Copyright (c) 2003, 2007, 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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* @test
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* @bug 4809008
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* @build Bean
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* @run main/othervm -server -XX:SoftRefLRUPolicyMSPerMB=0 Test4809008
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* @summary Tests memory leak with multiple class loader access
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* @author Mark Davidson
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*/
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import java.beans.BeanInfo;
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import java.beans.Introspector;
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/**
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* This tests to see if the classes will be garbage collected when multiple
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* short lived classloaders populate the BeanInfo cache with classes.
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* <p/>
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* We are also trying to verify if the ClassLoader finalize method is called.
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* <p/>
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* Use:
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* java -verbose:class to print out class loading.
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* java -verbose:gc to print out gc events.
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*/
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public class Test4809008 {
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public static void main(String[] args) throws Exception {
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printMemory("Start Memory");
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int introspected = 200;
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for (int i = 0; i < introspected; i++) {
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ClassLoader cl = new SimpleClassLoader();
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Class type = cl.loadClass("Bean");
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type.newInstance();
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// The methods and the bean info should be cached
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BeanInfo info = Introspector.getBeanInfo(type);
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cl = null;
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type = null;
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info = null;
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System.gc();
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}
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System.runFinalization();
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printMemory("End Memory");
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int finalized = SimpleClassLoader.numFinalizers;
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System.out.println(introspected + " classes introspected");
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System.out.println(finalized + " classes finalized");
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// good if at least half of the finalizers are run
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if (finalized < (introspected >> 1)) {
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throw new Error("ClassLoaders not finalized: " + finalized);
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}
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}
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private static void printMemory(String message) {
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Runtime runtime = Runtime.getRuntime();
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runtime.gc();
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long free = runtime.freeMemory();
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long total = runtime.totalMemory();
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System.out.println(message);
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System.out.println("\tfree: " + free);
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System.out.println("\ttotal: " + total);
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}
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}
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