--- old/src/java.desktop/share/classes/sun/font/ExtendedTextSourceLabel.java	2017-02-13 09:33:16.665250391 -0800
+++ new/src/java.desktop/share/classes/sun/font/ExtendedTextSourceLabel.java	2017-02-13 09:33:16.537250392 -0800
@@ -779,7 +779,7 @@
         if (gx == gxlimit) {
            tgt = charInfo.length / numvals;
         } else {
-           tgt = indices[gx]-1;
+           tgt = indices[gx];
         }
         if (DEBUG) {
            System.err.println("gx=" + gx + " gxlimit=" + gxlimit +
--- /dev/null	2016-11-01 09:38:44.965684815 -0700
+++ new/test/java/awt/font/TextLayout/HitTest.java	2017-02-13 09:33:16.885250390 -0800
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+
+/* @test
+ * @summary verify Hit index with supplementary characters.
+ * @bug 8173028
+ */
+
+import java.awt.Font;
+import java.awt.font.FontRenderContext;
+import java.awt.font.TextHitInfo;
+import java.awt.font.TextLayout;
+
+public class HitTest {
+
+  public static void main(String args[]) {
+      String s = new String(new int[]{0x1d400, 0x61}, 0, 2);
+      Font font = new Font("Dialog", Font.PLAIN, 12);
+      FontRenderContext frc = new FontRenderContext(null, false, false);
+      TextLayout tl = new TextLayout(s, font, frc);
+      TextHitInfo currHit = TextHitInfo.beforeOffset(3);
+      TextHitInfo prevHit = tl.getNextLeftHit(currHit);
+      System.out.println("index=" + prevHit.getCharIndex()+
+                         " leading edge=" + prevHit.isLeadingEdge());
+      if (prevHit.getCharIndex() != 2) {
+          throw new RuntimeException("Expected 2 for hit index");
+      }
+   }
+}