1 /* 2 * Copyright (c) 2017, 2018, 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 8056900 27 * @summary Verifies message returned with NoClassDefFoundError exception. 28 * @library /test/lib 29 * @modules java.base/jdk.internal.misc 30 * java.compiler 31 * @run main/native NoClassDefFoundErrorTest 32 */ 33 34 import jdk.test.lib.Asserts; 35 import jdk.test.lib.compiler.InMemoryJavaCompiler; 36 import jdk.internal.misc.Unsafe; 37 38 public class NoClassDefFoundErrorTest { 39 40 static native void callDefineClass(String className); 41 static native void callFindClass(String className); 42 static { 43 System.loadLibrary("NoClassDefFoundMsg"); 44 } 45 46 // Test illegal class names. Too long or null. 47 static void test_classNames() throws Exception { 48 Unsafe unsafe = Unsafe.getUnsafe(); 49 50 byte klassbuf[] = InMemoryJavaCompiler.compile("TestClass", "class TestClass { }"); 51 52 // Create a class name of length 65536. 53 StringBuilder tooBigClassName = new StringBuilder("z"); 54 for (int x = 0; x < 16; x++) { 55 tooBigClassName = tooBigClassName.append(tooBigClassName); 56 } 57 58 // Test JVM_DefineClass() with long name. 59 try { 60 unsafe.defineClass(tooBigClassName.toString(), klassbuf, 4, klassbuf.length - 4, null, null); 61 throw new RuntimeException("defineClass did not throw expected NoClassDefFoundError"); 62 } catch (NoClassDefFoundError e) { 63 if (!e.getMessage().contains("Class name exceeds maximum length of ")) { 64 throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage()); 65 } 66 } 67 68 // Test JNI_DefineClass() with long name. 69 try { 70 callDefineClass(tooBigClassName.toString()); 71 throw new RuntimeException("DefineClass did not throw expected NoClassDefFoundError"); 72 } catch (NoClassDefFoundError e) { 73 if (!e.getMessage().contains("Class name exceeds maximum length of ")) { 74 throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage()); 75 } 76 } 77 78 // Test JNI_FindClass() with long name. 79 try { 80 callFindClass(tooBigClassName.toString()); 81 throw new RuntimeException("DefineClass did not throw expected NoClassDefFoundError"); 82 } catch (NoClassDefFoundError e) { 83 if (!e.getMessage().contains("Class name exceeds maximum length of ")) { 84 throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage()); 85 } 86 } 87 88 // Test JNI_FindClass() with null name. 89 try { 90 callFindClass(null); 91 throw new RuntimeException("FindClass did not throw expected NoClassDefFoundError"); 92 } catch (NoClassDefFoundError e) { 93 if (!e.getMessage().contains("No class name given")) { 94 throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage()); 95 } 96 } 97 } 98 99 private static class ClassWithFailedInitializer { 100 public static final int i = (new Object[1])[0].hashCode(); 101 } 102 103 // If static initialization of a class failed, later access to it 104 // throws a NoClassDefFoundError. This error chains the exeption 105 // thrown in the previous initialization. This test assures this is 106 // working properly. 107 static void test_chainStaticInitializerException() throws Exception { 108 Object[] o = new Object[1024]; 109 System.gc(); 110 111 try { 112 if (ClassWithFailedInitializer.i == 0) { 113 throw new RuntimeException("Class initialization succeeded but is designed to fail."); 114 } 115 throw new Exception("Expected exception was not thrown."); 116 } 117 catch (ExceptionInInitializerError e) { 118 Asserts.assertNE(e.getCause(), null, "Expecting cause in ExceptionInInitializerError."); 119 Asserts.assertEQ(e.getCause().getClass(), NullPointerException.class, "sanity"); 120 } 121 122 // Make sure the VM kept the stored exception alive. 123 o = null; 124 System.gc(); 125 o = new Object[16384]; 126 o = new Object[16384]; 127 o = new Object[16384]; 128 o = new Object[16384]; 129 System.gc(); 130 131 try { 132 if (ClassWithFailedInitializer.i == 0) { 133 throw new RuntimeException("Class initialization succeeded but is designed to fail."); 134 } 135 throw new Exception("Expected exception was not thrown."); 136 } catch (NoClassDefFoundError e) { 137 e.printStackTrace(); 138 Asserts.assertNE(o, null, "sanity"); 139 Asserts.assertNE(e.getCause(), null, "Expecting chained exception"); 140 Asserts.assertEQ(e.getCause().getClass(), ExceptionInInitializerError.class, 141 "Wrong exception chained: " + e.getCause()); 142 System.identityHashCode(e.getCause()); 143 System.identityHashCode(e); 144 } 145 } 146 147 public static void main(String args[]) throws Exception { 148 test_classNames(); 149 test_chainStaticInitializerException(); 150 } 151 }