Bridging the Gap Between Database and Stream with Speedment (July, 23)

July 15th, 2018 No comments

We are happy to announce our next JUG UA meetup with EPAM support!

Date: July 23, 19:00 – 21:30 (registration from 18:30)
Venue:  iHUB, Khreschatyk St, 10, Kyiv


Live streaming registration



  • Bridging the Gap Between Database and Stream (Emil Forslund @ Speedment, Palo Alto)

Whenever you write code that mixes languages and domains, like Java and SQL, you are going to get bugs. A solution to this is to move away from query languages like SQL and instead write your business logic with the type-safe and object-oriented constructs we have learned to love in Java, like Streams, Predicates, and Functions. In this talk, you will rediscover the power of the Stream interface in a completely new domain; relational databases. You will also learn how nicely it blends in with your existing application, even with no modifications on the database layer. This will not only increase your productivity but also help you build safer and more maintainable Java code.


Emil is a Palo Alto based Java developer heavily involved in the Open Source project Speedment. Heis the author of the Java blog “Age of Java” ( and frequently writes Java-related articles for DZone with tens of thousands of reads. He is also a JavaOne alumnus and recurring speaker at events like DevNexus, BaselOne, JUGs, Meetups, GOTO Events and JForums



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Rockstars Night with Spring and Kotlin stars (May, 17th)

May 10th, 2018 No comments

We are happy to announce our joint JUG UA, Kyiv Kotlin User Group, JEEConf meetup!

Date: May 17, 18:00 – 22:00 (registration from 17:30)
Venue: Grammarly Kyiv, Gulliver Business Center, Tower B, floor 14, 1a Sportyvna Square, Kyiv



  • Reactive Spring (Juergen Hoeller, Josh Long @ Pivotal)

Spring Framework 5 is here ! It introduces the Spring developer to a growing world of support for reactive programming across the Spring portfolio, starting with a new Netty-based web runtime, component model and module called Spring WebFlux, and then continuing to Spring Data Kay, Spring Security 5.0, Spring Boot 2.0 and Spring Cloud Finchley. Sure, it sounds like a lot, but don’t worry! join us, your guides, Spring co-founder and Spring Framework lead Juergen Hoeller and Spring developer advocate Josh Long, and we’ll explore the wacky world of Reactive Spring together.

  • Multiplatform development with Kotlin (Dmitry Jemerov @ JetBrains)

In Kotlin 1.2, we’ve added support for developing multiplatform projects. Multiplatform projects allow you to reuse the business logic written in Kotlin between all the components of your application – backend code on the JVM, frontend code in JS, and also mobile apps. The common code is compiled for all platforms and can access platform-specific implementations of APIs and libraries. The platform-specific parts are also written in Kotlin and have access to the full set of features of the corresponding platform.

  • Cool after-party!!!

Kharkiv JUG UA Meetup: Microservices Versioning & Designing RESTful services

March 28th, 2018 No comments

We gladly invite you to the upcoming JUG UA meetup in Kharkiv. At this event we will talk about the versioning of services in Microservices architecture style; will share with you some tips & tricks you need to know while designing RESTful services.

When: April 5, 2018
Where:, Blagovischenska Steet 1, Kharkiv

Join Online


2b || !2b with reactive Spring at JUG UA (March, ?)

February 15th, 2018 No comments

We are happy to announce our next JUG UA meetup!

Date: March 28, 19:00 – 22:00 (registration from 18:30)
Venue: Grammarly Kyiv, Gulliver Business Center, Tower B, floor 14, 1a Sportyvna Square, Kyiv




  • Do you really need reactive Spring? (Oleh Dokuka @ Levi 9, Igor Lozynskyi @Ciklum/Zoomdata)

Reactivity – is a buzzword. Nowaday’s market talks about reactivity. Vert.x, Akka, what else? Right – recently Spring Framework introduced new module called WebFlux, which allows building Reactive Application using traditional Spring features. But do we really need that module, will it help us in our every-day job, will it in solving our problems? What else is hidden behind that? All that stuff will be discussed during the talk and finally, we will get an understanding whether starting/migrating your current project with/to Reactive Spring worth it.

Read more…

Workshop: Microservices with Spring Cloud by Orkhan Gasimov

January 14th, 2018 No comments

Date: February, 10-11
Venue:, Kharkiv

Registration and details

Воркшоп проведёт Орхан Гасымов – разработчик-архитектор с профессиональный опытом 15 лет специализирующийся на разработке распределенных приложений.


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Workshop: Hands-on Reactive Programming in Java

January 5th, 2018 No comments

Workshop will be useful for Reactive programming adopters, who have no previous experience. During workshop you will learned the most popular libraries for reactive programming in Java (RxJava, Reactive Streams, Project Reactor) and have a practical exercises.

Date: February, 3rd
Time: 10:00 – 17:00
Venue: Wix Kyiv office,  Pankivska St, 14А, Kyiv

Registration (Sold Out)

Date: February, 10th
Time: 09:00 – 17:00
Venue: Epam Lviv office,  Oleny Stepanivny St, 45, Lviv


Read more…

Kharkiv JUG UA Meetup #9 with Orkhan Gasimov

December 19th, 2017 No comments

When: 8th of February, 18:30 – 21:30 (UTC+02)
Where: Fabrika Space, Blagoveshchenskaya str. 1 (Kharkiv)


To join live streaming


  • Refactoring Monolith to Microservices (Orkhan Gasimov)

– Monolith vs Microservices
– Refactoring Practices
– Packaging Practices
– Anti-pattern: Distributed Monolith

  • Fault Tolerance in Distributed Environment (Orkhan Gasimov)

– Cascading Fails & Blocked Resources
– N-Modular Redundancy & Recovery Blocks
– Circuit Breakers & Error Kernel Pattern
– Instance Healers

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Kharkiv JUG UA Meetup #8: reactive systems and the vanguard of eCommerce

December 11th, 2017 No comments

When: December 13, 2017


Monitoring of reactive systems (Solution Architect, Yevgen Mospan)

Hybris: the vanguard of eCommerce (Lead Software Engineer, Vitalii Kolchytskyi)


Distributed Application Design with Spring Cloud at JUG UA (November 30)

November 16th, 2017 No comments

We are happy to announce our next JUG UA meetup!

Date: November 30, 19:00 – 22:00 (registration from 18:30)
Venue: “Olympic Hall – Vokzalnaya”, Vasylia Lypkivskoho St, 3, Kyiv

Our partner EPAM provides everyone with a possibility to join this event online.


  • Patterns of Distributed Application Design with live coding session using Spring Cloud (Orkhan Gasimov, Vadim Ivanov @AppsFlyer) (video, code, slides)

We will start with a single service monolith application and go through steps of it’s evolution up to a distributed solution. We will do it in theory and in practice and see a hello-world live-coding example discussing it in details.


  1. Patterns & Architectures
  2. Issues & Bottlenecks
  3. Security Concerns
  4. Communication, Composition & Orchestration
  5. Data Consistency
  6. Live coding using Spring Cloud

Zaporizhia JUG UA meetup: voice chat bot & Spring profiles

November 2nd, 2017 No comments

When: 15th of November, 2017 (18:30 – 21:30)

Where: Zaporizhia, Hotel “Intourist”


Speakers and talks

  • Viacheslav Kolbasin, Lead Software Engineer @EPAM

Topic: “Voice chat bot? It is easy with Amazon Alexa!”

This topic will be about how to create a voice chat bots using Amazon Alexa. We will discover how Alexa Voice Service and Amazon Echo device work and will try to create a simple chat-bot.

Also, we will discuss advanced topics like session, authorization and home cards. In addition, we will discuss how to use Alexa to create multi-modality bots and other applications with voice user interface.

  • Maksym Bruner, Solution Architect @EPAM

Topic: Using Spring Profiles

We will talk about various best practices around spring profiles – powerful feature allowing flexible configuration in multiple environments.
Also, I will show a couple examples how profiles could be used for test automation and others type of testing.
Bonus part will be a list of tips how to configure your Spring Boot application to follow “The Twelve-Factor App” principles.