JPrime 2015 videos are now available at http://jprime.io/nav/article/40.
jPrime is a one day conference with talks on Java, various languages on the JVM, mobile, web and best practices.
This year it was held on 27th May 2015 in Sofia Event Center. It's run by the Bulgarian Java User Group and backed by the biggest companies in the city.
jPrime features a combination of great international speakers along with the best presenters from Bulgaria and the Balkans.
More info for 2016 at http://jprime.io