1 /* 2 * Copyright (c) 2010, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 import java.io.BufferedReader; 25 import java.io.InputStream; 26 import java.io.InputStreamReader; 27 28 import static jdk.testlibrary.Asserts.assertGreaterThan; 29 import jdk.test.lib.process.ProcessTools; 30 31 import com.sun.tools.attach.AttachNotSupportedException; 32 import com.sun.tools.attach.VirtualMachine; 33 34 import sun.tools.attach.HotSpotVirtualMachine; 35 36 /* 37 * @test 38 * @bug 6942989 39 * @summary Check for WeakReference leak in Logger and anonymous Logger objects 40 * @library /lib/testlibrary 41 * @library /test/lib 42 * @modules jdk.attach/sun.tools.attach 43 * java.logging 44 * @build jdk.test.lib.process.ProcessTools 45 * @run main/othervm -Djdk.attach.allowAttachSelf TestLoggerWeakRefLeak Logger 46 * @run main/othervm -Djdk.attach.allowAttachSelf TestLoggerWeakRefLeak AnonymousLogger 47 */ 48 public class TestLoggerWeakRefLeak { 49 50 private static final String TARGET_CLASS = "java.lang.ref.WeakReference"; 51 private static final int INSTANCE_COUNT = 100; 52 private static int loggerCount = 0; 53 54 public static void main(String[] args) throws Exception { 55 if (args[0].equals("AnonymousLogger")) { 56 System.out.println("Test for WeakReference leak in AnonymousLogger object"); 57 testIfLeaking(TestLoggerWeakRefLeak::callAnonymousLogger); 58 } else { 59 System.out.println("Test for WeakReference leak in Logger object"); 60 testIfLeaking(TestLoggerWeakRefLeak::callLogger); 61 } 62 } 63 64 /** 65 * For these particular WeakReference leaks, the count was always observed 66 * to be increasing so if decreasing or the same count is observed, 67 * then there is no leak. 68 */ 69 private static void testIfLeaking(Runnable callLogger) throws Exception { 70 long count = 0; 71 int instanceCount = 0; 72 int previousInstanceCount = 0; 73 int increasingCount = 0; 74 int decreasingCount = 0; 75 76 while (true) { 77 callLogger.run(); 78 count += INSTANCE_COUNT; 79 80 if ((count % 1000) == 0) { 81 System.out.println("call count = " + count); 82 83 instanceCount = getInstanceCountFromHeapHisto(); 84 if (instanceCount > previousInstanceCount) { 85 increasingCount++; 86 } else { 87 decreasingCount++; 88 System.out.println("increasing count: " + increasingCount); 89 System.out.println("decreasing or the same count: " + decreasingCount); 90 System.out.println("Test passed: decreasing or the same instance count is observed"); 91 break; 92 } 93 previousInstanceCount = instanceCount; 94 } 95 96 delayExecution(); 97 } 98 } 99 100 /** 101 * This Logger call is leaking two different WeakReferences: 102 * - one in LogManager.LogNode 103 * - one in Logger.kids 104 */ 105 private static void callLogger() { 106 for (int i = 0; i < INSTANCE_COUNT; i++) { 107 java.util.logging.Logger.getLogger("logger-" + loggerCount); 108 if (++loggerCount >= 25000) { 109 // Limit the Logger namespace used by the test so the weak refs 110 // in LogManager.loggers that are being properly managed 111 // don't skew the counts by too much. 112 loggerCount = 0; 113 } 114 } 115 } 116 117 /** 118 * This Logger call is leaking a WeakReference in Logger.kids 119 */ 120 private static void callAnonymousLogger() { 121 for (int i = 0; i < INSTANCE_COUNT; i++) { 122 java.util.logging.Logger.getAnonymousLogger(); 123 } 124 } 125 126 /** 127 * 'vm.heapHisto("-live")' will request a full GC 128 */ 129 private static int getInstanceCountFromHeapHisto() throws AttachNotSupportedException, Exception { 130 int instanceCount = 0; 131 132 HotSpotVirtualMachine vm = (HotSpotVirtualMachine) VirtualMachine 133 .attach(Long.toString(ProcessTools.getProcessId())); 134 try { 135 try (InputStream heapHistoStream = vm.heapHisto("-live"); 136 BufferedReader in = new BufferedReader(new InputStreamReader(heapHistoStream))) { 137 String inputLine; 138 while ((inputLine = in.readLine()) != null) { 139 if (inputLine.contains(TARGET_CLASS)) { 140 instanceCount = Integer.parseInt(inputLine 141 .split("[ ]+")[2]); 142 System.out.println("instance count: " + instanceCount); 143 break; 144 } 145 } 146 } 147 } finally { 148 vm.detach(); 149 } 150 151 assertGreaterThan(instanceCount, 0, "No instances of " + TARGET_CLASS + " are found"); 152 153 return instanceCount; 154 } 155 156 /** 157 * Delay for 1/10 of a second to avoid CPU saturation 158 */ 159 private static void delayExecution() { 160 try { 161 Thread.sleep(100); 162 } catch (InterruptedException ie) { 163 // Ignore any exceptions 164 } 165 } 166 167 }