src/java.base/share/classes/sun/text/normalizer/Normalizer2.java

*** 1,7 ****
  /*
!  * Copyright (c) 2015, 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
--- 1,7 ----
  /*
!  * Copyright (c) 2015, 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
*** 133,145 ****
--- 133,147 ----
              // and is already normalized.
              int spanLength=spanQuickCheckYes(src);
              if(spanLength==src.length()) {
                  return (String)src;
              }
+             if (spanLength != 0) {
                  StringBuilder sb=new StringBuilder(src.length()).append(src, 0, spanLength);
                  return normalizeSecondAndAppend(sb, src.subSequence(spanLength, src.length())).toString();
              }
+         }
          return normalize(src, new StringBuilder(src.length())).toString();
      }
  
      /**
       * Writes the normalized form of the source string to the destination string