JavaSkop 2019

Nikola Zivkov

@nikolazivkov

Topic: A deterministic way to run and test your applications with Testcontainers

Gone are the days when your application consisted of just a web server and a database. The complexity of today’s applications is such that they need to persist their data in a variety of database stores (MongoDB, Cassandra), provide full text search capabilities (Elasticsearch), speak to other applications (RabbitMQ, Kafka) or simply interact with a third-party system over REST.

Setting up your local and CI environment with all these infrastructure services can be quite the challenge. Starting with the tedious process of manual setup, keeping the documentation up to date, OS and product version differences (“works on my machine” anyone?), the list of potential problems goes on and on.

Once we venture into integration testing, a different set of problems arise. Running your JPA queries against an H2 in-memory database is well supported but how do you make sure that your MongoDB or Elasticsearch queries work?

Testcontainers provides a deterministic way of running and testing your applications. It automates the environment setup by leveraging Docker so you don’t need to do it manually, and spins up Docker containers for the duration of the integration tests and tears them down once the test execution has finished. Out-of-the-box support is provided for well known RDBMS services (PostgreSQL, MySQL, MariaDB, etc.), Elasticsearch, Kafka, Webdriver, Localstack, etc but any third-party service can be wired-in by leveraging GenericContainer as base. Complex scenarios are supported through Testcontainer’s integration with Docker Compose.

Bio:

Nikola Zivkov is a Technology Line Manager for Java at Seavus. With more than 15 years of experience in building Java enterprise solutions, he’s passionate about building resilient architectures that can withstand the test of time (and crazy client demands). He’s been a member of the Macedonian JUG since the group’s second meeting.

Martin Ilievski

@martinmaxs

Topic: A deterministic way to run and test your applications with Testcontainers

Gone are the days when your application consisted of just a web server and a database. The complexity of today’s applications is such that they need to persist their data in a variety of database stores (MongoDB, Cassandra), provide full text search capabilities (Elasticsearch), speak to other applications (RabbitMQ, Kafka) or simply interact with a third-party system over REST.

Setting up your local and CI environment with all these infrastructure services can be quite the challenge. Starting with the tedious process of manual setup, keeping the documentation up to date, OS and product version differences (“works on my machine” anyone?), the list of potential problems goes on and on.

Once we venture into integration testing, a different set of problems arise. Running your JPA queries against an H2 in-memory database is well supported but how do you make sure that your MongoDB or Elasticsearch queries work?

Testcontainers provides a deterministic way of running and testing your applications. It automates the environment setup by leveraging Docker so you don’t need to do it manually, and spins up Docker containers for the duration of the integration tests and tears them down once the test execution has finished. Out-of-the-box support is provided for well known RDBMS services (PostgreSQL, MySQL, MariaDB, etc.), Elasticsearch, Kafka, Webdriver, Localstack, etc but any third-party service can be wired-in by leveraging GenericContainer as base. Complex scenarios are supported through Testcontainer’s integration with Docker Compose.

Bio:

Martin Ilievski is a Senior Developer at Seavus, technology geek and a frontend aficionado. He is an Oracle certified Java Master and holds a Bachelor's degree of Computer Science from FSCE. In his spare time, he enjoys coding, playing guitar, and eating pizza.

Tomche Delev

@tdelev

Topic: Spring and Kotlin, is it a functional relationship?

Spring Framework 5 introduced dedicated Kotlin support to ensure that Spring and Kotlin play well together. One of the key strengths of Kotlin is that it provides a very good interoperability with libraries written in Java. But there are ways to go even further and allow writing fully idiomatic Kotlin code when developing your next Spring application.

In the presentation I will cover the following:

- a very brief introduction to Kotlin

- how to write a minimal Spring Boot application using only Kotlin

- Kotlin plugins for Spring support

- JPA and data classes

- nullability support

- extension methods and more.

With many examples of code I will try to show you can write more expressive and functional applications in your favorite framework using the full power of Kotlin.

Bio:

Former TA at FINKI, with industry experience in start-up with great passion about sharing knowledge. Worked as developer and architect for ten years on business applications and personal projects in many different technologies and programming languages. Passionate about Java and JVM technologies, clean code, programming languages and from recently functional programming.

Antonio Ivanovski

Topic: Back in the days, developers used to write boilerplate code

Few of today most popular libraries like Dagger, AutoValue and ButterKniffe are made possible by the ability to generate code at compile time. In this talk I will touch on the basics of Annotation Processing and dive a bit deeper on code generation with JavaPoet.

Bio:

Working as Android Developer at Netcetera. Like to live on the edge by using latest and grea... not tested technologies. However, working mainly on serious banking related projects, this is not always possible. Because of this I have developed love for pet projects that allow me to experiment and go crazy.

Martin Nachev

Topic: JUnit: Revenge of the 5th

JUnit 4 might be considered the standard testing framework in Java, but since its release in 2006 not much has changed, as the framework neglected to provide ways to simplify testing or make it more flexible. Luckily, in 2017, a developer-friendly upgrade - JUnit 5 - was released with its main goals being to be both backwards and forwards compatible. JUnit 5 features include parallel and conditional test execution, tagging, nested tests, dynamic tests, repeated tests, parametrized tests, custom display names and more. Furthermore, with the new JUnit Platform, third-party test engines can be developed for other JVM languages. This presentation walks the audience through the JUnit 5 architecture, highlights the advantages over its predecessor, and covers the way to migrate from JUnit 4 to JUnit 5.

Bio:

Martin Nachev is an Oracle certified Java Knight with four years of experience in the battlefield. Martin is a clean code devotee and a fan of automation testing, hence the passion for unit testing. He is in constant search for improvement, thus he spends his spare time voraciously reading programming books and attending conferences. This time, he is walking onto stage as one of the presenters himself.

Gjorgji Janevski

Topic: Not another UX presentation

Across different plastic examples spectators should understand the importance of the UX process. Getting out and talking with clients and potential users is equal important as the development process of the product. The pillars of the project and its intuitive and usability perfection is also based on the UX process. UX is not a profession it is experience gathered with practice and research results. Basically you dont need UI if you understand in total the user needs, habits, daily routine etc.

Bio:

I’m graphic a designer from Skopje, Macedonia with more than 10+ years of experience. I cover large area of techniques and design software and love to explore design in every aspect of life. Currently focused on solving problems with interface and UX concept in Sorsix.

Viktor Kajtazov

Topic: Swagger Codegen for lazy developers

Live code session for developing client and server application using one single source (yaml) of truth.

Bio:

Viktor Kajtazov is 4 years experienced software engineer at Polar Cape. Has been working with several technologies and different software architectures. Passionate about clean code and scalable architectures.

Dejan Jankov

@dejanjankov

Topic: Boilerhate - hate for boilerplate

Writing code is not hard. But writing correct code is a challenge. That involves a lot more work than the production of code itself. So we aim to minimize the amount of boilerplate code we write by applying various tools to our work, in order to decrease the time we spend on menial tasks and increase the time spent on business-impacting tasks. Code generation through annotation processor or the java.lang.reflect.Proxy can and does greatly help in achieving this goal.

The presentation will explore the few ways of code generation in Java, and how Spring's BeanPostProcessor and relatives help in applying the code generation solutions automatically and on an application level. Ever wondered how Spring's @Transactional, @ConfigurationProperties or @Validated are applied? Will cover the ways in which Spring retrofits our code to add functionality on top of it like the mentioned transaction management, bean validation, and how we can use the same approach to develop similar solutions on our own. And will go through the annotation processing way of code generation again with a personal example, and open source projects like QueryDsl, Lombok, Dagger, MapStruct, and others.

Bio:

Dejan Jankov is a Certified Scrum Master. Besides not benefiting from this certification in any way, he is a full time developer and lead of a remote team. With more than 6 years of experience in building Java enterprise and Android applications, his interests span from talking requirement owners out of bad ideas to cooking, designing solutions and constant refactoring.

Milan Savić

@MilanSavic14

Topic: Introduction to DDD, CQRS, and EventSourcing with Axon Framework

DDD (Domain-Driven Design) offers a number of valuable architectural guardrails such as bounded contexts, domain events and sets a good base for CQRS (Command Query Responsibility Segregation). If we apply these architectural concepts wisely, they enable us to write a friendly, structured monolith that can be transformed into microservices in a controlled manner. The Axon Framework helps even more by providing a clean, location-transparent, event-driven way of implementing these architectural concepts.

In this talk, we will zoom in on this DDD/CQRS approach to evolutionary microservices with Axon. As part of the talk, there will be a live coding demo showing Axon in action. Join me to learn from each other new ways of dealing with software complexity!

Bio:

Milan Savić is a Software Engineer at AxonIQ. He has experience with various software projects ranging from chemical analyzers to contactless mobile payment systems. In some of those projects, CQRS and Event Sourcing came as a natural solution, but things had to be built from scratch almost every time. Finding out about AxonFramework got him interested in being a part of the solution. In March 2018 he joined AxonIQ team on a mission to build tools and frameworks which would help others in building event-driven, reactive systems.

Laurentiu Spilca

Topic: Architectural anti-patterns when delivering a software ecosystem with Kubernetes.

The link between the architecture and how to deploy a software environment is one of the most important factors that lead to a great result: a high available, fast accessible, reliable and easy to change software service. Let's discover through live-coding approach what the aspects and common pitfalls are when delivering your software with Kubernetes.

Bio:

Laurentiu Spilca is a dedicated development lead and trainer at Endava, where he is leading the development of a project in the financial market of European Nordic countries. He has over nine years of experience. Previously, he was a software developer building one of the biggest ERP solutions with worldwide installations. Laurentiu believes it’s important to not only deliver high-quality software but also share knowledge and help others to upskill, which has driven him to design and teach courses related to Java technologies and deliver presentations and workshops. Outside work, Laurentiu is passionate about traveling and scuba diving.

Panche Chavkovski

@hsilomedus

Topic: The eleventh hour

Have you chosen your JDK 11 flavor yet? No?

Learn what you need to do in order to get along with the new release train, and get your project up to date: what options are there, how painful the migration is, what can you do.

Also, the story is not over yet. Get a quick peek at what's coming next to JDK near you.

Bio:

Pance is a senior software engineer at Netcetera and one of the JUGMK leaders. He is a Java and IoT developer on daily basis, part-time hardware maker, and one of the team behind the codefu.mk coding competition. Every now and then, Pance blogs at pance.mk

Mincho Tonev

Topic: Customer Driven Development

How nice would it be if you could address customer feedback before even releasing the product?

Find out how the customers became part of our R&D process in vSphere Client!

Come and see the tools we used and our success stories.

While building the new vSphere Client, we were able to constantly gather feedback from our customers.

We were able to address many requests and bugs found on the customer environment.

The more we listened, the more customers continued to share.

They were willing to present their use-cases, environment and organization to make us see how our product fit their needs.

Bio:

Mincho is a Staff engineer in the company and one of the most successful product owners in the Vsphere UI team. He has significant impact on the vSphere Client quality and customer experience.

Stojan Peshov

@spesov

Topic: Confessions of a Senior Mind

I'd like to confess what it feels like to be a senior, maybe that would help juniors undestand us better. :) I'll try to briefly run over my everyday problems and challenges and see how much can the audience identify with it. It's tough to be a senior, but also fun at the same time.

Bio:

Stojan Peshov is Java developer with more than 10 years experience in web and back-end development. He has worked on a wide range of projects and business domains using open source libraries and frameworks such as Spring, Hibernate, Magnolia CMS, IceFaces, Hessian, RobotFramework, AngularJS, etc. As such, he has tasted different flavors of Java: JSP, JSF, JPA, JTA, CDI, as well as Test Automation, ETL, HTML5, Javascript and Web Services.

Dragan Sahpaski

@dragansah

Topic: OKRs for software engineers: A tool for personal and team growth.

Many of us are hands-on software engineers and it is often that we face challenges when working in a team or collaborating with few or many people. OKRs are a management tool which can be used from small individual teams to large and cascaded organizations. We will focus on small and nimble teams and even individuals managing themselves. The secret of 1+1 > 2 lies in good collaboration and what other better tool for software developers than one invented by engineers at Intel and pioneered by Google from when they were a 30 person team until today when they're still using it and perfecting it.

We will go through two interactive examples which are enough for understanding the basics and inspiring oneself to look more closely into OKRs. The advantages of OKRs will be obvious, even for the young audience which hasn't been yet introduced to management methods for better team work.

OKRs have been implemented in many Silicon Vally startups and other companies under the mentorship of John Doer (who also mentored Google) and have been vastly popularized in the past several years mainly with his book "Measure What Matters".

We will engage the audience with interactive examples and will give out copies of John Doer's book "Measure What Matters".

Bio:

Dragan is the CTO of Sorsix. Dragan has over fifteen years’ experience at all levels of software development, and in his current role is involved in establishment of standards for development and software project management at Sorsix.

Dejan Dimitrovski

@ddejan

Topic: Continuous reliability

Congratulations, you decided to adopt one of the agile methodologies. You have implemented the CI/CD workflow with boards, sprints, standups, and retrospectives with all the bells and whistles. So, what is wrong? Why are you still struggling with errors and unpredictable expectations? Maybe you think you are not agile enough or maybe there is a missing link in your CI/CD workflow. It is time to talk about Continuous Reliability - the key principle for success with agile. Join this session to tackle challenges and pitfalls in adoption of agile principles through real-life cases. Let’s talk how can the Continuous Reliability principle strengthen the software development process from planning, management execution, development, testing and delivery perspective, aligned to customer and request management, continuous integration, automated tests, and continuous delivery with highest level of stability. All through examples that reflect on team practices and cultural changes.

Bio:

Dejan Dimitrovski position himself as a trusted advisor to his clients and team members providing best business solutions with maximizing the usage of the technologies applying best practices. Always willing to share his dreams and visions, rising challenges and realizing opportunities into real-life solution. His best value is always to be dedicated and committed to achieve great business goals utilizing all available resources effectively.

Regular speaker on local and regional conferences and events covering topics on agile software development, best software development practices, service oriented and cloud-based solutions. As one of the founders on technical communities, he is constantly involved in all activities and events organized by the community.

He is Cloud addict, proud owner of many certificates and achievements who actively chase for interesting and attractive business adventures. He constantly improves his knowledge reading business and management books and articles. Besides that, he is passionate nature lover in a form of running, hiking and skiing.

Aleksandra Hristov

@alexhris

Topic: Front-end up front

Using pattern libraries to improve the communication between designers and developers and the importance of including the whole team and the client into the planning phase.

How to plan and build components that can be used in different contexts and within other components with examples from real projects. How we have used UX design principles to ease our front-end implementations with code examples using the latest CSS features and Angular.

Bio:

Aleksandra is a computer science engineer, currently working as a Senior UX designer and front-end developer in Netcetera, with about 10 years of professional experience. She has had talks about HTML/CSS, Responsive design, User Experience and Mobile app design within the company, at the events - Mobile Monday Macedonia, Digit, EESTEC Academy, MobileFirstMK, Front-end meetups at Skopje's Hacklab KIKA - and as a guest lecturer at the Faculty of Computer Science and Engineering.

Miki Jankov

@Miki_Mixajlo

Topic: How we managed to make our office building, a smart office building.

We'll discuss how we started the "IoT initiative" inside the company that we are currently working for, what are our plans and what have we achieved so far. Quick overview of the project(s) and the different technologies(software stack/hardware) involved in the project. We will continue with explaining what problems can we have while implementing a project like this in an existing building and what one should watch out for.

Bio:

JMiki is a senior software engineer at Intertec, currently working as a backend developer. He is a Java software engineer, embedded systems enthusiast and home automation hobbyist, trying to automate most of the tasks at home. Currently investing his free time in the "IoT smart villa" and trying to automate the office building that he is working at.

Lazar Majstorchev

Topic: How we managed to make our office building, a smart office building.

We'll discuss how we started the "IoT initiative" inside the company that we are currently working for, what are our plans and what have we achieved so far. Quick overview of the project(s) and the different technologies(software stack/hardware) involved in the project. We will continue with explaining what problems can we have while implementing a project like this in an existing building and what one should watch out for.

Bio:

Quality Assurance Engineer at Intertec - Product Development Company. In charge of the processes within the CI / CD pipeline. Striving for continuous delivery in an approach which incorporates the concepts of continuous integration, automated testing and continuous deployment. An IoT enthusiast, who loves hiking & mountain climbing.