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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
commit 0a580b313d
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test/hotspot/jtreg/runtime/exceptionMsgs/NullPointerException/NPEInHiddenTopFrameTest.java Normal file
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/*
* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2019 SAP SE. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test
* @summary Test NullPointerException messages thrown in frames that
* are hidden in the backtrace/stackTrace.
* @bug 8218628
* @library /test/lib
* @compile -g NPEInHiddenTopFrameTest.java
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:-ShowHiddenFrames -XX:+ShowCodeDetailsInExceptionMessages NPEInHiddenTopFrameTest hidden
* @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+ShowHiddenFrames -XX:+ShowCodeDetailsInExceptionMessages NPEInHiddenTopFrameTest visible
*/
import jdk.test.lib.Asserts;
public class NPEInHiddenTopFrameTest {
@FunctionalInterface
private static interface SomeFunctionalInterface {
String someMethod(String a, String b);
}
public static void checkMessage(String expression,
String obtainedMsg, String expectedMsg) {
System.out.println();
System.out.println(" source code: " + expression);
System.out.println(" thrown msg: " + obtainedMsg);
if (obtainedMsg == null && expectedMsg == null) return;
System.out.println("expected msg: " + expectedMsg);
Asserts.assertEquals(expectedMsg, obtainedMsg);
}
public static void main(String[] args) throws Exception {
boolean framesAreHidden = false;
if (args.length > 0) {
String arg = args[0];
if (arg.equals("hidden")) framesAreHidden = true;
}
try {
final SomeFunctionalInterface concatter = String::concat;
final String nullString = null;
if (concatter != null) {
// This throws NPE from the lambda expression which is a hidden frame.
concatter.someMethod(nullString, "validString");
}
} catch (NullPointerException e) {
checkMessage("concatter.someMethod(nullString, \"validString\");", e.getMessage(),
framesAreHidden ?
// This is the message that would be printed if the wrong method/bci are used:
// "Cannot invoke 'NPEInHiddenTopFrameTest$SomeFunctionalInterface.someMethod(String, String)'" +
// " because 'concatter' is null."
// But the NPE message generation now recognizes this situation and skips the
// message. So we expect null:
null :
// This is the correct message, but it describes code generated on-the-fly.
// You get it if you disable hiding frames (-XX:+ShowHiddenframes).
"Cannot invoke \"String.concat(String)\" because \"<parameter1>\" is null" );
e.printStackTrace();
}
}
}