| /* |
| * 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); |
| } |
| } |