1 /* 2 * Copyright (c) 2003, 2013, 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 /* 25 * @test 26 * @bug 4858522 27 * @summary Basic unit test of HotspotClassLoadingMBean.getInitializedClassCount() 28 * @author Steve Bohne 29 * @run main/othervm -XX:+UsePerfData GetInitializedClassCount 30 */ 31 32 /* 33 * This test is just a sanity check and does not check for the correct value. 34 */ 35 36 import sun.management.*; 37 38 public class GetInitializedClassCount { 39 40 private static HotspotClassLoadingMBean mbean = 41 (HotspotClassLoadingMBean)ManagementFactoryHelper.getHotspotClassLoadingMBean(); 42 43 // Careful with these values. 44 private static final long MIN_VALUE_FOR_PASS = 1; 45 private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE; 46 47 private static boolean trace = false; 48 49 public static void main(String args[]) throws Exception { 50 if (args.length > 0 && args[0].equals("trace")) { 51 trace = true; 52 } 53 54 long value = mbean.getInitializedClassCount(); 55 56 if (trace) { 57 System.out.println("Initialized class count: " + value); 58 } 59 60 if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) { 61 throw new RuntimeException("Initialized class count " + 62 "illegal value: " + value + " " + 63 "(MIN = " + MIN_VALUE_FOR_PASS + "; " + 64 "MAX = " + MAX_VALUE_FOR_PASS + ")"); 65 } 66 67 // Initialize a class 68 Class.forName("ClassToInitialize0"); 69 70 long value2 = mbean.getInitializedClassCount(); 71 72 if (trace) { 73 System.out.println("Initialized class count2: " + value2); 74 } 75 76 // If new count does not reflect that at least one class has 77 // been initialized, throw an exception. We don't check that 78 // _exactly_ one class has been initialized because another 79 // thread may (rarely) have also done some class initialization. 80 if (value2 < value + 1) { 81 throw new RuntimeException("Initialized class count " + 82 "did not increase " + 83 "(value = " + value + "; " + 84 "value2 = " + value2 + ")"); 85 } 86 87 System.out.println("Test passed."); 88 } 89 } 90 91 class ClassToInitialize0 { 92 static int i = 0; 93 static { 94 i = 1; 95 } 96 }