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8358526: Clarify behavior of java.awt.HeadlessException constructed with no-args

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Reviewed-by: honkar, tr, azvegint
Backport-of: 81985d422d3a433c1248deec18e4fd9b9f780c2c
This commit is contained in:
Phil Race 2025-06-23 17:05:48 +00:00
parent ca6b165003
commit fe9efb75b0
2 changed files with 52 additions and 1 deletions
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4
src/java.desktop/share/classes/java/awt/HeadlessException.java
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@ -48,7 +48,9 @@ public class HeadlessException extends UnsupportedOperationException {
private static final long serialVersionUID = 167183644944358563L;
/**
* Constructs new {@code HeadlessException} with empty message.
* Constructs a new {@code HeadlessException} with {@code null} as its detail message.
* The default headless message may replace {@code null} in some cases, as outlined below.
* <p>
* For such {@code HeadlessException} the default headless error message
* may be auto-generated for some platforms.
* The text of the default headless message may depend on

49
test/jdk/java/awt/Headless/HeadlessExceptionTest.java Normal file
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@ -0,0 +1,49 @@
/*
* Copyright (c) 2025, Oracle and/or its affiliates. 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.
*/
import java.awt.HeadlessException;
/*
* @test 8358526
* @summary Verify behaviour of no-args HeadlessException and getMessage
* @run main/othervm -Djava.awt.headless=true HeadlessExceptionTest
* @run main/othervm HeadlessExceptionTest
*/
public class HeadlessExceptionTest {
public static void main (String[] args) {
String nullmsg = new HeadlessException().getMessage();
String emptymsg = new HeadlessException("").getMessage();
System.out.println("nullmsg=" + nullmsg);
System.out.println("emptymsg=" + emptymsg);
if (nullmsg != null) {
if ("".equals(nullmsg)) {
throw new RuntimeException("empty message instead of null");
}
if (!nullmsg.equals(emptymsg)) {
throw new RuntimeException("non-null messages differ");
}
}
}
}