--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jpackager.runtime/share/classes/jdk/jpackager/runtime/singleton/SingleInstanceListener.java	Mon Nov 05 17:32:00 2018 -0500
@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2017, 2018, 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 jdk.jpackager.runtime.singleton;
+
+/**
+ * The {@code SingleInstanceListener} interface is used for implementing
+ * Single Instance functionality for Java Packager.
+ *
+ * @since 12
+ */
+public interface SingleInstanceListener {
+
+    /**
+     * This method should be implemented by the application to
+     * handle the single instance behaviour - how should the application
+     * handle the arguments when another instance of the application is
+     * invoked with params.
+     *
+     * @param params parameters for the application main
+     */
+    public void newActivation(String... params);
+}