1 /* 2 * Copyright (c) 2014, 2021, 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.File; 25 import java.io.FileOutputStream; 26 import jdk.internal.org.objectweb.asm.ClassWriter; 27 import jdk.internal.org.objectweb.asm.MethodVisitor; 28 import static jdk.internal.org.objectweb.asm.Opcodes.*; 29 import jdk.test.lib.process.ProcessTools; 30 import jdk.test.lib.process.OutputAnalyzer; 31 32 /* 33 * @test OverriderMsg 34 * @bug 8026894 35 * @library /test/lib 36 * @modules java.base/jdk.internal.org.objectweb.asm 37 * java.base/jdk.internal.misc 38 * java.management 39 * @compile -XDignore.symbol.file OverriderMsg.java 40 * @run driver OverriderMsg 41 */ 42 43 // This test checks that the super class name is included in the message when 44 // a method is detected overriding a final method in its super class. The 45 // asm part of the test creates these two classes: 46 // 47 // public class HasFinal { 48 // public final void m(String s) { } 49 // } 50 // 51 // public class Overrider extends HasFinal { 52 // public void m(String s) { } 53 // public static void main(String[] args) { } 54 // } 55 // 56 public class OverriderMsg { 57 dump_HasFinal()58 public static void dump_HasFinal () throws Exception { 59 60 ClassWriter cw = new ClassWriter(0); 61 MethodVisitor mv; 62 63 cw.visit(V1_7, ACC_PUBLIC + ACC_SUPER, "HasFinal", null, "java/lang/Object", null); 64 65 { 66 mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); 67 mv.visitCode(); 68 mv.visitVarInsn(ALOAD, 0); 69 mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V"); 70 mv.visitInsn(RETURN); 71 mv.visitMaxs(1, 1); 72 mv.visitEnd(); 73 } 74 { 75 mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "m", "(Ljava/lang/String;)V", null, null); 76 mv.visitCode(); 77 mv.visitInsn(RETURN); 78 mv.visitMaxs(0, 2); 79 mv.visitEnd(); 80 } 81 cw.visitEnd(); 82 try (FileOutputStream fos = new FileOutputStream(new File("HasFinal.class"))) { 83 fos.write(cw.toByteArray()); 84 } 85 } 86 87 dump_Overrider()88 public static void dump_Overrider () throws Exception { 89 90 ClassWriter cw = new ClassWriter(0); 91 MethodVisitor mv; 92 cw.visit(V1_7, ACC_PUBLIC + ACC_SUPER, "Overrider", null, "HasFinal", null); 93 94 { 95 mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); 96 mv.visitCode(); 97 mv.visitVarInsn(ALOAD, 0); 98 mv.visitMethodInsn(INVOKESPECIAL, "HasFinal", "<init>", "()V"); 99 mv.visitInsn(RETURN); 100 mv.visitMaxs(1, 1); 101 mv.visitEnd(); 102 } 103 { 104 mv = cw.visitMethod(ACC_PUBLIC, "m", "(Ljava/lang/String;)V", null, null); 105 mv.visitCode(); 106 mv.visitInsn(RETURN); 107 mv.visitMaxs(0, 2); 108 mv.visitEnd(); 109 } 110 { 111 mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null); 112 mv.visitCode(); 113 mv.visitInsn(RETURN); 114 mv.visitMaxs(0, 1); 115 mv.visitEnd(); 116 } 117 cw.visitEnd(); 118 119 try (FileOutputStream fos = new FileOutputStream(new File("Overrider.class"))) { 120 fos.write(cw.toByteArray()); 121 } 122 } 123 124 main(String... args)125 public static void main(String... args) throws Exception { 126 dump_HasFinal(); 127 dump_Overrider(); 128 ProcessBuilder pb = ProcessTools.createTestJvm("-cp", ".", "Overrider"); 129 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 130 output.shouldContain( 131 "java.lang.IncompatibleClassChangeError: class Overrider overrides final method HasFinal.m(Ljava/lang/String;)V"); 132 output.shouldHaveExitValue(1); 133 } 134 135 } 136