jPrime 2015 was HUGE!

jPrime 2015 held on 27 of May 2015 gained a huge success!

12 speakers from 8 countries!
400 attendees!
6 coorgs and 14 sponsors!

Photos from 2015 issue of the conference are available on Flickr and on Facebook!

Even more photos and emotions can be found on Twitter under the tag #jPrime

Here are the slides. Stay tuned for the videos...
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Interview with Gerrit Grunwald

Gerrit Grunwald a JavaOne rockstar and Java Champion will be a speaker on this years pilot issue of the JPrime Conference in Sofia, Bulgaria. We have the pleasure to make a short interview with him.

Dear Gerrit,
How long have you been involved in professional Java development ? Can you tell us a little more about your current activities?

I'm involved in professional Java development since 2001. In all these years I was mainly working on client side Java...yes Java on the desktop and it's not dead yet :) In the last couple of years my focus shifted more and more from desktop to embedded devices based on ARM technology. Java might not be the right choice for so called edge devices but it's great for stuff like IoT gateways and more powerful embedded devices like Raspberry Pi etc.

You participate in a lot of communities. Would you share some more info about that?

Well after looking for people using Java for years in the city where I live I decided to found a Java User Group here. This happened 7 years ago and we are still alive and kicking. In addition to that I'm also co-leading the JavaFX and IoT community at Oracle where we try to aggregate information about those topics.

As a real guru at your domain what was the hardest challenge you have met?

The hardest challenge was porting an awesome Swing application (which was designed by professional designers) of a German customer to JavaFX 8 based on the JDK8 developer preview builds 2.5 years ago. Because with every new weekly build of JDK8 we had to adjust our code again which was a lot of additional work. The other challenge was to not even copy the design of the Swing app but make it even look better. It took us a year but we made it :)

What is the main message you would like to bring to the JPrime conference audience?

Be part of the Java community if you are not already and let's continue pushing things forward.

Do you have some other hobbies beside coding and hacking?

I love Skateboarding and Snowboarding which I do both for more than 20 years.

Thank you very much!
See you in Sofia next month!
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I guess I'm the bravest one and the first blog post will be mine.

In this blog we'll try to tell our story. Our - the people behind the conference.

So the introduction:

Who are we?

It's five of us - Ivan, Mitya, Nayden, Martin and Mihail (that's me). We're part of the Bulgarian Java User Group (bgjug,, Some of us are on the pictures on the front page of

In the last couple of years we've been involved in Adopt OpenJDK(fixing jaxp bugs, , we've written some code (primitives in generics), we go to conferences around the world (javaone trip), we do hackatons (valhalla hackaton), we write tutorials (building openjdk on osx/linux).mihail

Although our day jobs are quite different, all of us are somehow involved with popularizing the Java idea.

The conference

We decided to organize a conference. Far larger than the hackatons we do. We wanted it to benayden

- "wow, this guy is coming to the conference? I will ask my boss to buy me a ticket". We want the presenters to be the best. No marketing lectures allowed.


- shiny (awesome venue with a perfect organisation). Since we're doing this for the first time - it might not go perfect, but we'll do our best, our motivation is unmatched. Some of us have been dreaming about this moment for many years.

- accessible - We're not making any money out of it. We'remartin doing it because we like the idea. It's not free, because we have expenses we have to cover. Also we want attendees to commit.


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