code: public void toJson(ByteBuffer byteBuffer, String additionalFieldPrefix) {
          toJson(OutputAccessor.from(byteBuffer), additionalFieldPrefix);
      }
docs: Create a JSON representation for this {@link GelfMessage} and write it to the {@link ByteBuffer}. Additional fields are
  prefixed with {@code additionalFieldPrefix}.
  
  @param byteBuffer must not be {@literal null}
  @param additionalFieldPrefix must not be {@literal null}