How to use

writeSpan

method

in

zipkin.internal.JsonCodec

 @Override public byte[] encode(Span span) {
  return Codec.JSON.writeSpan(span);
 }
};

public static byte[] toSpanBytes(Span span, Long timestampMillis) {
 return timestampMillis != null
   ? prefixWithTimestampMillis(Codec.JSON.writeSpan(span), timestampMillis)
   : Codec.JSON.writeSpan(span);
}