src/share/classes/sun/nio/cs/ext/DoubleByte.java

*** 608,617 ****
--- 608,622 ----
                  return encodeArrayLoop(src, dst);
              else
                  return encodeBufferLoop(src, dst);
          }
  
+         protected byte[] repl = replacement();
+         protected void implReplaceWith(byte[] newReplacement) {
+             repl = newReplacement;
+         }
+ 
          public int encode(char[] src, int sp, int len, byte[] dst) {
              int dp = 0;
              int sl = sp + len;
              int dl = dst.length;
              while (sp < sl) {
*** 620,630 ****
                  if (bb == UNMAPPABLE_ENCODING) {
                      if (Character.isHighSurrogate(c) && sp < sl &&
                          Character.isLowSurrogate(src[sp])) {
                          sp++;
                      }
-                     byte[] repl = replacement();
                      dst[dp++] = repl[0];
                      if (repl.length > 1)
                          dst[dp++] = repl[1];
                      continue;
                  } //else
--- 625,634 ----
*** 875,885 ****
                  if (bb == UNMAPPABLE_ENCODING) {
                      if (Character.isHighSurrogate(c) && sp < sl &&
                          Character.isLowSurrogate(src[sp])) {
                          sp++;
                      }
-                     byte[] repl = replacement();
                      dst[dp++] = repl[0];
                      if (repl.length > 1)
                          dst[dp++] = repl[1];
                      continue;
                  } //else
--- 879,888 ----