--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.desktop/share/classes/java/awt/HeadlessException.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2000, 2016, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+package java.awt;
+
+/**
+ * Thrown when code that is dependent on a keyboard, display, or mouse
+ * is called in an environment that does not support a keyboard, display,
+ * or mouse. Any code that depends on any of those devices should firstly
+ * ensure their availability using the {@code GraphicsEnvironment.isHeadless()}
+ * method and throw {@code HeadlessException} if the latter returns
+ * {@code true}.
+ *
+ * @since 1.4
+ * @author  Michael Martak
+ * @see GraphicsEnvironment#isHeadless
+ */
+public class HeadlessException extends UnsupportedOperationException {
+    /*
+     * JDK 1.4 serialVersionUID
+     */
+    private static final long serialVersionUID = 167183644944358563L;
+
+    /**
+     * Constructs new {@code HeadlessException} with empty message.
+     * 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
+     * whether the GraphicsEnvironment is in fact headless.
+     * That is, the default headless message is both system and environmentally
+     * dependent.
+     */
+    public HeadlessException() {}
+
+    /**
+     * Create a new instance with the specified detailed error message.
+     * For some platforms the default headless error message may be
+     * added at the end of the specified message.
+     * The text of the default headless message may depend on
+     * whether the GraphicsEnvironment is in fact headless.
+     * That is, the default headless message is both system and environmentally
+     * dependent.
+     *
+     * @param  msg the error message
+     */
+    public HeadlessException(String msg) {
+        super(msg);
+    }
+
+    /**
+     * Returns the detail message string of this {@code HeadlessException}.
+     * Depending on the platform the message specified in the constructor may
+     * be followed by the default headless error message.
+     * The text of the default headless message may depend on
+     * whether the GraphicsEnvironment is in fact headless.
+     * That is, the default headless message is both system and environmentally
+     * dependent.
+     *
+     * @return  the detail message string of this {@code HeadlessException}
+     *          instance (which may be {@code null}).
+     */
+    public String getMessage() {
+        String superMessage = super.getMessage();
+        String headlessMessage = GraphicsEnvironment.getHeadlessMessage();
+
+        if (superMessage == null) {
+            return headlessMessage;
+        } else if (headlessMessage == null) {
+            return superMessage;
+        } else {
+            return superMessage + headlessMessage;
+        }
+    }
+}