Posts Tagged ‘JUG’

Hibernate & Multithreading talks at JUGUA (April 20th)

April 2nd, 2016 2 comments

JUG_logoDear friends, we are happy to announce our next JUG UA meeting
Date: April 20, 19:00 – 23:00
Venue: EPAM Systems, Kudryashova 14B (Cafeteria)


  • Agenda

– Hibernate performance tuning (Igor Dmitriev) (video, slides)

Nowadays, almost every Enterprise application uses Hibernate and as we know, DB could be a bottleneck in the application. Furthermore incorrect uses of ORM frameworks can lead to performance problems.
In my talk, I will cover:
1. How to measure and increase performance
2. About different optimization techniques and effective practices
3. About pitfalls and bugs
4. Hibernate tuning techniques
5. How some Hibernate features work under the hood
My talk will be based on my own experience, and I’ll show developers’ common mistakes.
This talk will be useful both for beginners and professionals alike.

– Multithreading in Java past & present (Yevgen Polukov) (video, slides)

In this talk I’d like to give you an overview of java.util.concurrent package and represent useful Java concurrency tools. I’ll cover the core functionality and the state-of-the-art API (Executors, Accumulators, StampedLock  etc).
In addition, I would like to show some ways of its implementation. As we know, the presentation has no worth without examples, so there will be some of them during the talk.

From CRUD to Hypermedia APIs with Spring at JUGUA (March 10)

February 29th, 2016 No comments

12640381_528256597345232_8958142163180476694_oDear friends, we are happy to announce our next JUG UA meeting with an extended version of Vladimir Tsukur’s JavaDay Kyiv talk “From CRUD to Hypermedia APIs with Spring

Date: March 10, 19:00 – 23:00

Venue: EPAM Systems, Kudryashova 14B (Cafeteria)

  • Agenda

From CRUD to Hypermedia APIs with Spring (extended version)

Typical way to design and expose HTTP API today is a so called CRUD approach: come up with URL templates for resources, map create-read-update-delete operations to HTTP verbs and serialize domain model as JSON. Nice and easy, isn’t it?
This talk will present limitations of CRUD style APIs and how to address them using “real” REST and hypermedia, HAL and ALPS. We’ll take a look how a set of libraries and tools from Spring helps building these APIs. All the talking is not worth it without an example, so Spring-based application will be our guide.
Amazon, PayPal, GitHub and other API providers have already started embracing hypermedia and linking by enhancing their HTTP interfaces. Are you next?

Thanks to EPAM Systems you can participate in the meeting online

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Develop modern apps using Spring ecosystem at BigData era at JUGUA (February 24)

February 8th, 2016 No comments

OlegTTDear friends, we are happy to announce our next JUG UA meeting with an extended version of Oleg Tsal-Tsalko’s JavaDay Kyiv talk “Develop modern apps using Spring ecosystem at BigData era

Date: February 24, 19:00 – 22:30

Venue: EPAM Systems, Kudryashova 14B (Cafeteria)


  • Agenda

    Develop modern apps using Spring ecosystem at BigData era (extended version) (video, slides, src1, src2)

    Spring is no longer just a framework, it’s huge ecosystem with lots of technologies in there. Nowadays Spring is a platform for developing all sorts of applications from simple REST services to distributed systems doing complex streams or batch processing with real-time analytics leveraging BigData.
    In my talk I want to give you an overview of what Spring offers you today and how easy and cool is to develop Spring applications today using Spring Boot and Spring XD. Spring Boot and Spring XD are designed to take away most of the burden and boilerplate code required to develop standard things again and again and make complex things look easy.

The 3-4 most active participants will get free tickets to Java Frameworks Day 2016
Thanks to EPAM Systems you can participate in the meeting online

Apache Drill and Apache Spark at JUGUA (December 16th)

December 6th, 2015 No comments
Dear friends, we are happy to announce our next JUG UA meeting with great speaker from MapR (Apache Hadoop Distribution) – Tugdual Grall

  • Bio
Tugdual Grall is a Technical Evangelist at MapR, an open source advocate and a passionate developer. He currently works with the European developer communities to ease MapR, Hadoop and NoSQL adoption. Before joining MapR, Tug was Technical Evangelist at MongoDB and Couchbase. Tug has also worked as CTO at eXo Plaform and JavaEE product manager, and software engineer at Oracle. Tugdual is Co-Founder of the Nantes JUG (Java User Group) that holds since 2008 monthly meeting about Java ecosystem. Tugdual also writes a blog available at

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Org Report: JavaDay Kyiv 2015

December 2nd, 2015 No comments

The 20th anniversary year of Java is coming to an end. The final Java conference of the year – JavaDay Kyiv 2015, organized by JUG UA – took place in Kyiv November 6-7. Attendees heard presentations from 43 speakers from 25 countries, met the leaders and representatives of global Java communities, and raised their questions to the ‘father’ of Java, James Gosling, in an online session.

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Effectiveness and Java-code optimization на JUGUA (4 декабря)

November 23rd, 2015 6 comments

Коллеги, приглашаем Вас на первую зимнюю встречу JUG UA, на которой выступит гость из Одессы Сергей Моренец, автор книги “Development of Java applications” и сайта

Дата: пятница, 4 декабря, с 19:00 до 22:00
Адрес: ул. Кудряшова, 14-б (кафетерий), офис EPAM Systems


Программа встречи

– Эффективность и оптимизация кода в Java приложениях (Сергей Моренец) видео, слайды

Если мы захотим понять, что такое совершенный (идеальный) код, то одной из его характеристик будет эффективность. Это включает в себя и быстродействие кода, и объем потребляемых ресурсов (память, дисковых, I/O).
Зачастую эффективность отодвигается на второй план, поскольку ее не так просто рассчитать заранее, а также точно определить на ревью кода. В то же время это единственная характеристика, которая затрагивает конечного пользователя наших проектов.
В моем докладе я рассмотрю, что такое эффективность, как ее правильно измерять, мы коснемся мифов об эффективности, которые очень популярны сейчас, рассмотрим примеры эффективного и неэффективного кода, нужной и бессмысленной оптимизации кода.

Активных участники встречи, ждут лицензии от JetBrains.

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Performance testing & Spock на JUGUA (7 октября)

September 29th, 2015 2 comments

Коллеги, приглашаем Вас на осеннюю встречу JUG UA, на которой будет представлен доклад с трех крупных европейских конференций.

Дата: среда, 7 октбря, с 19:00 до 22:00
Адрес: ул. Кудряшова, 14-б (кафетерий), офис EPAM Systems


Программа встречи

– Performance testing: the way to make a true load (Izzet Mustafaiev)

If you heard about web-scale or have a requirement to survive under web-scale or you just would like to prepare your application to handle an X effect this topic is for you. During a presentation you will understand aspects and caveats of performance testing, nuances of performance testing of Java based web applications. As a practical part you will get a brief overview of existing tools and will get a guide of using Gatling as a tool to make a load for your application. Gatling is an open source tool for performance loading written in Scala and provides comprehensive DSL for load scenario specification.

– Spock: live long (code short) and prosper (Yaroslav Yermilov)

JUnit is in the game for a years and can be considered as the most popular Java library ever. But when have you heard about new features in JUnit last time? Isn’t it time to look at something new and modern?
For example, Spock — beautiful and highly expressive testing and specification framework. As many citizens of Groovy world, it’s in the same time highly compatible with existing Java infrastructure and, thanks to Groovy power, has amazingly clean and powerful DSL.
In this talk, we will look at variety of Spock feature and try to find answer how does testing beyond JUnit may look like.

Активных участники встречи, ждут лицензии от JetBrains и билеты на JavaDay Kyiv.

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James Gosling will give online talk at JavaDay Kyiv!

September 8th, 2015 No comments

Good news for Java UA Community! JavaDay Kyiv 2015 is one of the best Java events in Ukraine is coming soon.Thanks to…

Posted by Ruslan Synytsky on Tuesday, 8 September 2015

The 5th JavaDay Kiev (6th-7th of November)

August 9th, 2015 No comments

jdAs you know, this year is significant for Java. Our JUG have held JavaDay Lviv and JavaDay Kharkiv conferences devoted to Java’s anniversary.

The time is passing quickly and our team is working hard on the 5th JavaDay Kiev, which will be held in Kyiv on 6th-7th of November.

We already have a bunch of great speakers:

James Gosling, the father of the Java Language, awarded IEEE John von Neumann Medal (* will speak online)
Venkat Subramaniam, Agile Developer, Inc (Java Champion and JavaOne Rockstar, an award-winning author)
Arun Gupta, Red Hat (Java Champion and JavaOne Rockstar, author of the book Java EE 7 Essentials)
Bruno Souza, Brazilian JavaMan (Java Champion, Java Evangelist)
Marcus Lagergren (member of the Oracle Java language team, co-author of the book Oracle JRockit: The Definitive Guide)
Maurice Naftalin (Java Champion and JavaOne Rockstar, author of the book Mastering Lambdas: Java Programming in a Multicore World)
Baruch Sadogursky, JFrog (developer advocate of JFrog, JavaOne 2015 Featured Speaker)
Mohamed Taman, e-finance (Duke’s Choice Award Winner, Java Champion, author of the book JavaFX Essentials)
Kai Waehner, TIBCO (well-known international IT conferences speaker)
Oleg Shelajev, ZeroTurnaround (Developer Advocate, vJUG Organiser)
Alexey Grishchenko, Pivotal (evangelist and architect of distributed data processing systems)
Patrycja Wegrzynowicz, CTO of Yonita (Java EE researcher, JavaOne 2014 Featured Speaker)
Mikalai Alimenkou (Expert in Java development, JEEConf and XPDays organizer)
Ivar Grimstad, Cybercom (member of the JCP and in the Expert Groups for JSR 371 (MVC 1.0) and JSR 375 (Java EE Security API))
Nicolas Fränkel, Hybris (author of the book Integration Testing from the Trenches)
Alex Theedom (co-author of the book Professional Java EE Design Patterns)
Laurent Doguin, Couchbase (Developer Advocate)
and many more!
Almost all talks are in English!


At Sunday 8th of November, Dr. Venkat Subramaniam (award-winning author, founder of Agile Developer, Inc., and an instructional professor at the University of Houston) will held “Essence of Agility – The Key Technical Practices” practical workshop.

You are welcome to the 5th JavaDay Kiev conference!

Let’s move the Java world!

Hadoop & DistributableStream на JUGUA (5 августа)

July 30th, 2015 No comments

Коллеги, приглашаем Вас на летнюю встречу JUG UA

Дата: среда, 5 августа, с 19:00 до 22:00
Адрес: ул. Кудряшова, 14-б (кафетерий), офис EPAM Systems

Программа встречи


– Hadoop: Запусти слона (Yaroslav Yermilov)

Ккак можно взять и с нуля запустить и попробовать что-то интересное с Hadoop.

– Java 8 Collectors and Reducers properties, DistributableStream (Andrii Rodionov)

Java 8 предоставляет ряд готовых реализаций Collectors and Reducers, но о чем необходимо помнить чтобы написать свою реализацию. DistributableStream – можно ли сделать выполнение операций в Stream-е не только параллельным, но и распределенным.

Активных участники встречи, как обычно, ждет 2 лицензии от JetBrains.