1 /* 2 * Copyright (c) 2024, 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 * @summary Test casting of value objects to an unloaded type. 27 * @enablePreview 28 * @library /test/lib 29 * @run main/othervm -Xbatch -XX:CompileCommand=dontinline,TestUnloadedCastType::test* 30 * TestUnloadedCastType 31 */ 32 33 import jdk.test.lib.Asserts; 34 35 public class TestUnloadedCastType { 36 37 static value class MyValue { 38 int x = 0; 39 } 40 41 static class Unloaded { } 42 43 public static Object test(MyValue val) { 44 Object obj = val; 45 return (Unloaded)obj; 46 } 47 48 public static void main(String[] args) { 49 for (int i = 0; i < 50_000; ++i) { 50 Asserts.assertEQ(test(null), null); 51 } 52 try { 53 test(new MyValue()); 54 throw new RuntimeException("No ClassCastException thrown"); 55 } catch (ClassCastException e) { 56 // Expected 57 } 58 } 59 }