1 /* 2 * Copyright (c) 2020, 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 issues with instantiating hidden classes. 27 * @library /test/lib 28 * @modules java.compiler 29 * java.management 30 * @run main InstantiateHiddenClass 31 */ 32 33 import java.lang.invoke.MethodType; 34 import java.lang.invoke.MethodHandles; 35 import java.lang.invoke.MethodHandles.Lookup; 36 import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*; 37 import jdk.test.lib.compiler.InMemoryJavaCompiler; 38 39 public class InstantiateHiddenClass { 40 41 static byte klassbuf[] = InMemoryJavaCompiler.compile("TestClass", 42 "public class TestClass { " + 43 " public static void concat(String one, String two) throws Throwable { " + 44 " System.out.println(one + two);" + 45 " } } "); 46 47 public static void main(String[] args) throws Throwable { 48 49 // Test that a hidden class cannot be found through its name. 50 try { 51 Lookup lookup = MethodHandles.lookup(); 52 Class<?> cl = lookup.defineHiddenClass(klassbuf, false, NESTMATE).lookupClass(); 53 Class.forName(cl.getName()).newInstance(); 54 throw new RuntimeException("Expected ClassNotFoundException not thrown"); 55 } catch (ClassNotFoundException e ) { 56 // Test passed 57 } 58 59 60 // Create two hidden classes and instantiate an object from each of them. 61 // Verify that the references to these objects are different and references 62 // to their classes are not equal either. 63 Lookup lookup = MethodHandles.lookup(); 64 Class<?> c1 = lookup.defineHiddenClass(klassbuf, false, NESTMATE).lookupClass(); 65 Class<?> c2 = lookup.defineHiddenClass(klassbuf, false, NESTMATE).lookupClass(); 66 Object o1 = c1.newInstance(); 67 Object o2 = c2.newInstance(); 68 if (o1 == o2) { 69 throw new RuntimeException("Objects should not be equal"); 70 } 71 if (o1.getClass() == o2.getClass()) { 72 throw new RuntimeException("Classes should not be equal"); 73 } 74 } 75 }