1 /*

     2  * Copyright (c) 2019, 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.

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    23 

    24 /**

    25  * @test

    26  * @bug 8216977

    27  * @summary Test null source file and negative line number from hidden frame produces correct output.

    28  * @library /test/lib

    29  * @run main/othervm -XX:+ShowHiddenFrames HiddenFrameTest visible

    30  * @run main/othervm -XX:-ShowHiddenFrames HiddenFrameTest hidden

    31  */

    32 

    33 import jdk.test.lib.Asserts;

    34 

    35 public class HiddenFrameTest {

    36 

    37     @FunctionalInterface

    38     private static interface SomeFunctionalInterface {

    39         String someMethod(String a, String b);

    40     }

    41 

    42     static void assertContains(String expected, String actual, Exception e, boolean framesAreHidden) throws Exception {

    43         if (!framesAreHidden && !actual.contains(expected)) {

    44             throw new RuntimeException("Expected: " + expected + "; Actual: " + actual, e);

    45         } else if (framesAreHidden && actual.contains(expected)) {

    46             throw new RuntimeException("Unexpected: " + expected + "; Actual: " + actual, e);

    47         }

    48     }

    49 

    50     static void checkException(Exception e, boolean framesAreHidden) throws Exception {

    51         StackTraceElement[] fs = e.getStackTrace();

    52 

    53         if (fs.length < 2) {

    54             throw new RuntimeException("Exception should have at least two frames", e);

    55         }

    56 

    57         assertContains("someMethod(Unknown Source)", fs[0].toString(), e, framesAreHidden);

    58     }

    59 

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

    61         boolean framesAreHidden = false;

    62         if (args.length > 0) {

    63             String arg = args[0];

    64             if (arg.equals("hidden")) framesAreHidden = true;

    65         }

    66 

    67         try {

    68             final SomeFunctionalInterface concatter = String::concat;

    69             final String nullString = null;

    70             if (concatter != null) {

    71                 // This throws NPE from the lambda expression which is a hidden frame

    72                 concatter.someMethod(nullString, "validString");

    73             }

    74         } catch (NullPointerException e) {

    75             e.printStackTrace();

    76             checkException(e, framesAreHidden);

    77         }

    78     }

    79 }

    80