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 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 NoClassDefFoundMsg

    32  */

    33 

    34 import jdk.test.lib.InMemoryJavaCompiler;

    35 import jdk.internal.misc.Unsafe;

    36 

    37 public class NoClassDefFoundMsg {

    38 

    39     static native void callDefineClass(String className);

    40     static native void callFindClass(String className);

    41     static {

    42         System.loadLibrary("NoClassDefFoundMsg");

    43     }

    44 

    45 

    46     public static void main(String args[]) throws Exception {

    47         Unsafe unsafe = Unsafe.getUnsafe();

    48 

    49         byte klassbuf[] = InMemoryJavaCompiler.compile("TestClass", "class TestClass { }");

    50 

    51         // Create a class name of length 65536.

    52         StringBuilder tooBigClassName = new StringBuilder("z");

    53         for (int x = 0; x < 16; x++) {

    54             tooBigClassName = tooBigClassName.append(tooBigClassName);

    55         }

    56 

    57         // Test JVM_DefineClass() with long name.

    58         try {

    59             unsafe.defineClass(tooBigClassName.toString(), klassbuf, 4, klassbuf.length - 4, null, null);

    60             throw new RuntimeException("defineClass did not throw expected NoClassDefFoundError");

    61         } catch (NoClassDefFoundError e) {

    62             if (!e.getMessage().contains("Class name exceeds maximum length of ")) {

    63                 throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage());

    64             }

    65         }

    66 

    67         // Test JNI_DefineClass() with long name.

    68         try {

    69             callDefineClass(tooBigClassName.toString());

    70             throw new RuntimeException("DefineClass did not throw expected NoClassDefFoundError");

    71         } catch (NoClassDefFoundError e) {

    72             if (!e.getMessage().contains("Class name exceeds maximum length of ")) {

    73                 throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage());

    74             }

    75         }

    76 

    77         // Test JNI_FindClass() with long name.

    78         try {

    79             callFindClass(tooBigClassName.toString());

    80             throw new RuntimeException("DefineClass did not throw expected NoClassDefFoundError");

    81         } catch (NoClassDefFoundError e) {

    82             if (!e.getMessage().contains("Class name exceeds maximum length of ")) {

    83                 throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage());

    84             }

    85         }

    86 

    87         // Test JNI_FindClass() with null name.

    88         try {

    89             callFindClass(null);

    90             throw new RuntimeException("FindClass did not throw expected NoClassDefFoundError");

    91         } catch (NoClassDefFoundError e) {

    92             if (!e.getMessage().contains("No class name given")) {

    93                 throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage());

    94             }

    95         }

    96     }

    97 }