Jigasi: dev getting started

I just get started with developing Jigasi, running Debug in Eclipse. It gives a number of WARNINGs/SEVEREs or Exceptions. I am concerned that when I start making changes to the code, some of it may not work because these issues pre-exist. That’s why I would like guidance on what they mean, how to change the TLS or security policy? How serious are the errors?

What is a good way to test/debug transcription (repeatedly)? I see some sound files but no pre-recorded voice audio files or tests related to that. I won’t mind adding those to the repo, if you think that’s a good idea.