WildFly's mechanism for externalizing the serialization of a session identifier currently relies on the ability to write raw bytes to a RawProtoStreamWriter. As of ProtoStream 4.4.x, this will no longer be possible.
The Serializer interface is overly general for this use case anyway, and forces us to implement the full DataInput/Output interface. Switching to the Marshaller<String, ByteBuffer> interface will solve this problem.