A, somewhat over-complicated application for scanning a directory for MP3 files and allowing a user to see them. Uses bootstrap and angular to render the application; mongo to store it; and spring boot to tie it all together. I'm using spring data to access mongo, and I've used jms to handle the scanning jobs, but that's a little too much: I just wanted to play with that stuff a little.
Also, I'm using org.jaudiotagger to do the actual MP3 work.
You'll need a running mongo for this, but the application can set itselfup, once it's running.