diff -r 93708c7917fc -r ae27c6f1d8bf jdk/src/java.base/share/classes/java/text/MergeCollation.java
--- a/jdk/src/java.base/share/classes/java/text/MergeCollation.java	Wed Jul 01 22:17:32 2015 +0300
+++ b/jdk/src/java.base/share/classes/java/text/MergeCollation.java	Thu Jul 02 00:26:35 2015 +0300
@@ -329,8 +329,8 @@
                 PatternEntry e = patterns.get(i);
                 if (e.chars.regionMatches(0,entry.chars,0,
                                               e.chars.length())) {
-                    excessChars.append(entry.chars.substring(e.chars.length(),
-                                                            entry.chars.length()));
+                    excessChars.append(entry.chars, e.chars.length(),
+                            entry.chars.length());
                     break;
                 }
             }