--- a/jdk/src/share/classes/sun/text/SupplementaryCharacterData.java	Tue Oct 02 12:23:16 2012 +0100
+++ b/jdk/src/share/classes/sun/text/SupplementaryCharacterData.java	Wed Oct 03 15:11:28 2012 +0900
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2012, 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
@@ -32,6 +32,11 @@
 public final class SupplementaryCharacterData implements Cloneable {
 
     /**
+     * A token used as a character-category value to identify ignore characters
+     */
+    private static final byte IGNORE = -1;
+
+    /**
      * An array for supplementary characters and values.
      * Lower one byte is used to keep a byte-value.
      * Upper three bytes are used to keep the first supplementary character
@@ -78,7 +83,8 @@
             } else if (index > (end-1)) {
                 i = k;
             } else {
-                return dataTable[k] & 0xFF;
+                int v = dataTable[k] & 0xFF;
+                return (v == 0xFF) ? IGNORE : v;
             }
         }
     }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/text/BreakIterator/Bug7104012.java	Wed Oct 03 15:11:28 2012 +0900
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2012, 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
+ * @bug 7104012
+ * @summary Confirm that AIOBE is not thrown.
+ */
+
+import java.text.*;
+import java.util.*;
+
+public class Bug7104012 {
+
+    public static void main(String[] args) {
+        boolean err = false;
+
+        List<String> data = new ArrayList<>();
+        data.add("\udb40");
+        data.add(" \udb40");
+        data.add("\udc53");
+        data.add(" \udc53");
+        data.add(" \udb40\udc53");
+        data.add("\udb40\udc53");
+        data.add("ABC \udb40\udc53 123");
+        data.add("\udb40\udc53 ABC \udb40\udc53");
+
+        for (Locale locale : Locale.getAvailableLocales()) {
+            List<BreakIterator> breakIterators = new ArrayList<>();
+            breakIterators.add(BreakIterator.getCharacterInstance(locale));
+            breakIterators.add(BreakIterator.getLineInstance(locale));
+            breakIterators.add(BreakIterator.getSentenceInstance(locale));
+            breakIterators.add(BreakIterator.getWordInstance(locale));
+
+            for (BreakIterator bi : breakIterators) {
+                for (String str : data) {
+                    try {
+                        bi.setText(str);
+                        bi.first();
+                        while (bi.next() != BreakIterator.DONE) { }
+                        bi.last();
+                        while (bi.previous() != BreakIterator.DONE) { }
+                    }
+                    catch (ArrayIndexOutOfBoundsException ex) {
+                        System.out.println("    " + data.indexOf(str)
+                            + ": BreakIterator(" + locale
+                            + ") threw AIOBE.");
+                        err = true;
+                    }
+                }
+            }
+        }
+
+        if (err) {
+            throw new RuntimeException("Unexpected exeption.");
+        }
+    }
+
+}