src/share/classes/sun/nio/cs/UTF_8.java

*** 680,689 ****
--- 680,694 ----
                  return encodeArrayLoop(src, dst);
              else
                  return encodeBufferLoop(src, dst);
          }
  
+         private byte repl = (byte)'?';
+         protected void implReplaceWith(byte[] newReplacement) {
+             repl = newReplacement[0];
+         }
+ 
          // returns -1 if there is malformed char(s) and the
          // "action" for malformed input is not REPLACE.
          public int encode(char[] sa, int sp, int len, byte[] da) {
              int sl = sp + len;
              int dp = 0;
*** 707,717 ****
                          sgp = new Surrogate.Parser();
                      int uc = sgp.parse(c, sa, sp - 1, sl);
                      if (uc < 0) {
                          if (malformedInputAction() != CodingErrorAction.REPLACE)
                              return -1;
!                         da[dp++] = replacement()[0];
                      } else {
                          da[dp++] = (byte)(0xf0 | ((uc >> 18)));
                          da[dp++] = (byte)(0x80 | ((uc >> 12) & 0x3f));
                          da[dp++] = (byte)(0x80 | ((uc >>  6) & 0x3f));
                          da[dp++] = (byte)(0x80 | (uc & 0x3f));
--- 712,722 ----
                          sgp = new Surrogate.Parser();
                      int uc = sgp.parse(c, sa, sp - 1, sl);
                      if (uc < 0) {
                          if (malformedInputAction() != CodingErrorAction.REPLACE)
                              return -1;
!                         da[dp++] = repl;
                      } else {
                          da[dp++] = (byte)(0xf0 | ((uc >> 18)));
                          da[dp++] = (byte)(0x80 | ((uc >> 12) & 0x3f));
                          da[dp++] = (byte)(0x80 | ((uc >>  6) & 0x3f));
                          da[dp++] = (byte)(0x80 | (uc & 0x3f));