FULL PRODUCT VERSION :
java version "1.8.0_11"
Java(TM) SE Runtime Environment (build 1.8.0_11-b12)

ADDITIONAL OS VERSION INFORMATION :
MacOS 13.4.0 Darwin Kernel Version 13.4.0

A DESCRIPTION OF THE PROBLEM :
Running the below code results in different behavior in JDK8 from JDK7

@Test
  public void testTest() {
    CharsetDecoder decoder = Charsets.UTF_8.newDecoder();

    decoder.onMalformedInput(CodingErrorAction.REPLACE);
    decoder.onUnmappableCharacter(CodingErrorAction.REPLACE);

    ByteBuffer buf = ByteBuffer.allocate(20);
    buf.put(new byte[] { (byte)0xf8, (byte)0xa1, (byte)0xa1, (byte)0xa1,
            (byte)0xa1 });
    buf.flip();

    CharBuffer cbuf = CharBuffer.allocate(1);
    CoderResult res = decoder.decode(buf, cbuf, false);
    System.out.println(decoder.getClass().getName());
    System.out.println("Pos --- "+buf.position()+ "  cbuf pos --"+cbuf.position());
}

Jdk 7 output -->Pos --- 5  cbuf pos --1
Jdk 8 output -->Pos --- 1  cbuf pos --1

REGRESSION.  Last worked in version 7u67


REPRODUCIBILITY :
This bug can be reproduced always.