[SimpleRpcServer] Subsequent requests will have no response in case of request IO mess up

public int readAndProcess() throws IOException, InterruptedException {
  …
  if (data == null) {
    …
    initByteBuffToReadInto(dataLength);
    …
  }
  count = channelDataRead(channel, data);
  if (count >= 0 && data.remaining() == 0) { // count==0 if dataLength == 0
    process();
  }
  return count;
}

private void process() throws IOException, InterruptedException {
  data.rewind();
  try {
    ..
  } finally {
    dataLengthBuffer.clear(); // Clean for the next call
    data = null; // For the GC
    this.callCleanup = null;
  }
}