Java9 compatibility issue

[dizzzz]

in org.redline_rpm.ReadableChannelWrapper#read

public int read( final ByteBuffer buffer) throws IOException {
  final int read = channel.read( buffer);
  for ( Consumer< ?> consumer : consumers.values()) consumer.consume(( ByteBuffer) buffer.duplicate().flip());
  return read;
}

results in

java.lang.NoSuchMethodError: java.nio.ByteBuffer.flip()Ljava/nio/ByteBuffer;
	at org.redline_rpm.ReadableChannelWrapper.read(ReadableChannelWrapper.java:30) ~[redline-1.2.7-SNAPSHOT.jar:?]
	at org.redline_rpm.Util.fill(Util.java:75) ~[redline-1.2.7-SNAPSHOT.jar:?]
	at org.redline_rpm.Util.fill(Util.java:60) ~[redline-1.2.7-SNAPSHOT.jar:?]
	at org.redline_rpm.header.Lead.read(Lead.java:59) ~[redline-1.2.7-SNAPSHOT.jar:?]
	....
	Suppressed: java.io.IOException: There are '2' unfinished operations.
		at org.redline_rpm.ChannelWrapper.close(ChannelWrapper.java:214) ~[redline-1.2.7-SNAPSHOT.jar:?]
		at org.redline_rpm.ReadableChannelWrapper.close(ReadableChannelWrapper.java:42) ~[redline-1.2.7-SNAPSHOT.jar:?]

when compiled with Java9 and running on Java8. See plasma-umass/doppio#497