Could ByteBuffer implement DataOutput/DataInput?

Is there some subtle reason why java.nio.ByteBuffer does not implement java.io.DataOutput or java.io.DataInput, or did the authors just not choose to do this? It would seem straightforward to map the calls (e.g. putInt() -> writeInt()).

The basic problem I (and some others, apparently) have is older classes which know how to serialize/serialize themselves using the generic interfaces: DataInput/DataOutput. I would like to reuse my custom serialization without writing a custom proxy for ByteBuffer.