DevoxxPL - Krakow, 2015 - Report

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This summer I’ve decided to attend my 1st foreign conference - DevoxxPL - Krakow, Poland, 22-25 June 2015. It was very important experience, because I wanted to compare it with our local Ukrainian conferences. Long story short - the quality is equal. Any conference is based on speakers (I’d like to be “Captain Obvious”). And even awesome conference location can’t make conference great.

So, I’ve attended the next talks:

Day 1

  • “The Silver Bullet Syndrome” by Hadi Hariri
  • “Tips and tricks for clean relational db schemas” by Clément Delafargue
  • “JRebel under the covers - how is it even possible?” by Simon Maple
  • “Corporate startup and Scala” by Filip Rogaczewski from Spartez
    • It was really nice case study about building project with Scala. Pros&cons were “honestly” highlighted.
  • “Refactoring to Functional” by Hadi Hariri
  • “You’re an Architect…Now What?” by Nathaniel Schutta

Day 2

Day 3


This conference had a huge buzz around microservices. I’ve been inspired by some talks and planning to look deeper into:


JEEConf - Kiev, 2015 - Report

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It happened again - I attend JEEConf, May 22-23, 2015. And as usual it was inspiring. Also, I can say that “Scala” was the most dominated buzz word at this conference.

So, I attended the next talks:

  • Pragmatic Functional Refactoring with Java 8, by Richard Warburton Java 8 functional features were introduced here. And were shown how we can refactor OOP program in functional way. I can say it’s still a new way of thinking for Java developers.

  • Just what are you doing, HotSpot? by Gleb Smirnov - Gleb gave us several advices for understanding tricky HotSpot behavior and why we should read HotSpot sources.

  • Lessons from Implementing a Modern B2C System in Scala, by Yuriy Guts It was a case study talk about starting new project with Scala. The most interesting was the issues appeared during project development, team’s relationship with Scala, and Scala influences on non-Scala developers.

  • Spring Puzzlers, by Evgeny Borisov and Baruch Sadogursky - We can say that this topic is unique. At least I’m not aware of similar talks on other Java conferences. Spring Puzzlers is a variation of classic Java puzzlers, but in Spring. It’s really great collection of tricky Spring parts.

  • JVM Languages Q&A Panel with Jacek Laskowski, Baruch Sadogursky, Dmytro Mantula, Alexander Podkhalyuzin, Tomer Gabel We can say that this panel was Groovy vs Scala. There are no other “languages” on this talk.

  • Building an Enterprise-less online bank, Anton Keks - Anton doesn’t love bloated Spring and likes simple and clean solution. He doesn’t use Play Framework 2 on Scala because of slow compilation. Instead of this, he told us about his banking platform implemented on Play 1.3 and Java 8, and all other items included in his stack.

  • Everything you wanted to know about writing async, high-concurrency HTTP applications in Java, but were afraid to ask, by Baruch Sadogursky - Baruch shared his experience about implementing asynchronous file downloader in Java.

  • Scala Rock-Painting, by Dmytro Mantula - This talk was like Scala puzzlers and/or Scala tricky parts. Speaker also gave us several suggesting how we can learn Scala more effectively via practicing code katas and/or Anki flesh cards. This talk highlighted the “dark” side of Scala. Really, recommend it.

  • Groovy under Macroscope, by Sergei Egorov and Baruch Sadogursky - Sergei demoed us very hacky Groovy library MacroGroovy. It’s nice to see true Groovy hacker and his creature.

  • About concurrency abstractions with Observable’s, Future’s, Akka (actors) in Scala, by Jacek Laskowski - Jacek did Scala concurrency overview talk and highlighted other non-Akka libraries. It’s nice to know that there are other “good” way to do concurrency without Akka.

  • Node.js and Evented I/O Alternatives on the JVM, by Niko Köbler - I definitely heard about Avatar.js, but Niko told us that Avatar.js is dead and Oracle put development of Avatar on hold, i.e. full stop. As alternative were mentioned two solutions: DynJS an ECMAScript runtime for the JVM and Nodyn - Node.js compatible framework on JVM. It’s very interesting to see what will happen with them. Nodyn has strong RedHat support. Let’s hope it’s much stronger than Avatar.js had from Oracle.

  • Do we need JMS in 21st century? by Mikalai Alimenkou - The simple statements can be extracted from this talk: a) there are other non-JMS Message queues (MQs); b) we don’t need bloated JMS for every tasks; c) use right MQ for right job


  • JEEConf has dedicated JVM track: 50% of this track was occupied by Scala (7 talks). As for me this is the sign ;-) Scala bandwagon reached Ukraine.

  • Microservices everywhere. If you are not doing microservices - you should :-)

Yes, JEEConf is simply the best. XP Injection did amazing work.

Have fun, love Java!