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