*** old/src/share/classes/java/lang/StringBuffer.java	Mon May 20 01:31:51 2013
--- new/src/share/classes/java/lang/StringBuffer.java	Mon May 20 01:31:50 2013

*** 333,346 ****
--- 333,344 ----
       * @param   s the {@code CharSequence} to append.
       * @return  a reference to this object.
       * @since 1.5
       */
      @Override
!     public synchronized StringBuffer append(CharSequence s) {
          // Note, synchronization achieved via invocations of other StringBuffer methods after
          // narrowing of s to specific type
          // Ditto for toStringCache clearing
+         toStringCache = null;
          super.append(s);
          return this;
      }
  
      /**