this is not an actual issue it's just a question regards the method to_inputstream:

  io = java_input_stream.to_io # works for InputStreams, OutputStreams, and NIO Channels
  stream = io.to_inputstream # also to_outputstream and to_channel

Why it's not to_input_stream like to_java_bytes why the naming is not like ruby snake_case convention ?

update:
also to_outputstream shouldn't it be to_output_stream