1 /* 2 * Copyright (c) 2017, 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 8178870 27 * @summary Redefine class with CFLH twice to test deleting the cached_class_file 28 * @library /testlibrary 29 * @build RedefineClassHelper 30 * @run main RedefineClassHelper 31 * @run main/othervm/native -agentlib:RedefineDoubleDelete RedefineDoubleDelete 32 */ 33 34 public class RedefineDoubleDelete { 35 36 // Class gets a redefinition error because it adds a data member 37 public static String newB = 38 "class RedefineDoubleDelete$B {" + 39 " int count1 = 0;" + 40 "}"; 41 42 public static String newerB = 43 "class RedefineDoubleDelete$B { " + 44 " int faa() { System.out.println(\"baa\"); return 2; }" + 45 "}"; 46 47 // The ClassFileLoadHook for this class turns foo into faa and prints out faa. 48 static class B { 49 int faa() { System.out.println("foo"); return 1; } 50 } 51 52 public static void main(String args[]) throws Exception { 53 54 B b = new B(); 55 int val = b.faa(); 56 if (val != 1) { 57 throw new RuntimeException("return value wrong " + val); 58 } 59 60 // Redefine B twice to get cached_class_file in both B scratch classes 61 try { 62 RedefineClassHelper.redefineClass(B.class, newB); 63 } catch (java.lang.UnsupportedOperationException e) { 64 // this is expected 65 } 66 try { 67 RedefineClassHelper.redefineClass(B.class, newB); 68 } catch (java.lang.UnsupportedOperationException e) { 69 // this is expected 70 } 71 72 // Do a full GC. 73 System.gc(); 74 75 // Redefine with a compatible class 76 RedefineClassHelper.redefineClass(B.class, newerB); 77 val = b.faa(); 78 if (val != 2) { 79 throw new RuntimeException("return value wrong " + val); 80 } 81 82 // Do another full GC to clean things up. 83 System.gc(); 84 } 85 }