Internet of Things is becoming the heart of more and more projects. Each IoT project starts with a PoC prototype. This workshop will walk you through what a prototyping platform is and how it impacts the development of a project. Using the Bosch XDK, we will go through what such a board offers as sensors, connectivity, functionality and extensions and interesting examples from the real world. Bosch and Zuhlke developed the platform to encourage community development and open source coding thus we will see some live coding on the stop.

Connectivity is transforming all kind of domains – not just smart homes but also industry, buildings, agriculture and mobility. IoT has finally reached the corporate sector and is now being increasingly commercialized. As predicted Bosch alone already has more than 50 million of connected devices! . In 2025 all our products either possess intelligence themselves, or AI will have played a key role in their creation.  In their keynote address, Dr. Pavlin Dobrev and Kai Hackbarth traces Bosch’s evolution to an IoT company.  We will dive into the reference architecture for IoT domains like connected building, retail, smart architecture. For Bosch, Things are the most essential part in IoT. We design them to the requirements of IoT: Aware, Autonomous and Actionable.

Key findings:

• Bosch transformation from a traditional manufacturer to an IoT and high-tech company: Challenge accepted
• Innovation is part of our DNA
• Bosch embraces sustainability:  climate neutrality worldwide by 2020 and new solutions for better air in cities
• Nobody can do IoT alone: IoT platforms, software, and developers
• The impact of open source and agile organization

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The Cloud Native Era has changed a lot about what we expect from our applications making it challenging for traditional server side Java technologies. This talk will introduce you to Quarkus, a Kubernetes native Java stack that can tailor your application for GraalVM & Hotspot providing amazingly fast boot times and incredibly low RSS memory usage, making Java more than relevant in this brave new world.

Breaking news: You no longer need a PhD in quantum physicist to write Java that breaks the sound barrier! Join us live tonight and we are going to walk you through writing supersonic subatomic java with Quarkus!

Georgios and Ioannis are going to deliver a “deep dive” session into Quarkus structured into two ‘self-contained’ parts. The first part is going to cover application development essentials. The second part is going to be about cloud and integration

Please download the following before attending: https://github.com/iocanel/java2days-sofia-2019#Requirements

This presentation will introduce VMWare Identity Manager and it’s multi-year transformation from on-prem only product to Software-as-a-Service with multiple deployments per day, serving customers around the globe.
This “field guide” will focus on concrete learnings and practical examples of moving an on-prem monolith to AWS-hosted set of micro-services built on Java Stack. We will talk about a monolith decomposition, patterns and practices for SaaS and also about the path to achieving 99.99% availability.

Java offers a wide set of data structure implementations ready for developers. Collections are a great and powerful example.

These standard data structures are limited by borders of a single JVM. They depend on available memory within one server. They don’t scale during high loads.

In-memory data grids (IMDG) may help to solve this problem. They offer distributed versions of Java data structures. Data is spread across multiple servers. Data grids provide failover features and prevent data loss when a server crashes. And you can simply scale them up and down. Let’s go through the most popular Java native IMDG implementations and compare distributed data structures provided.

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Demo Code

Hackers, spies and Sofia never sleep. It became a custom that network communication is protected by a TLS protocol. TLS provides data confidentiality, integrity and authenticity.

The TLS is not just great, it’s also complex with a bunch of extensions. It’s not hard to use it in the wrong way and stay vulnerable against different types of attacks. What happens when your certificates expire? Do you validate hostnames? Which certificate authorities are trusted in your setup?

Let’s look together what support Java runtime provides out-of-the-box and what developers have to handle manually. The presentation will cover the performance consequences of using TLS and how the certificate validation works. We will also talk about the common implementation flaws and TLS communication debugging.

After the talk, attendees will be able to identify issues in their TLS usage and fix them.

Slides

We are living in a world where modern applications are consistently moving towards microservice-based architecture. Thus, internal service communication is becoming a vital part of any system. gRPC is a modern framework, developed initially at Google, which aims to solve many issues that we face using traditional means of communication such as REST. In its shell, it is an open source RPC framework which passes data through efficient protocol buffers. The framework is based on a client-server model of remote procedure calls and Interface Definition Language code generation. It supports languages, such as Java, C++, Python, Node.js, Go, and many others.

Here is a list with topics we are going to discuss during the talk:
1. What is gRPC?
2. Problems with REST and how gRPC can solve them
3. When to use gRPC over REST
4. Comparison to other communication technologies
5. Demo
6. Conclusion

We are living in a world where modern applications are consistently moving towards microservice-based architecture. Thus, internal service communication is becoming a vital part of any system. gRPC is a modern framework, developed initially at Google, which aims to solve many issues that we face using traditional means of communication such as REST. In its shell, it is an open source RPC framework which passes data through efficient protocol buffers. The framework is based on a client-server model of remote procedure calls and Interface Definition Language code generation. It supports languages, such as Java, C++, Python, Node.js, Go, and many others.

Here is a list with topics we are going to discuss during the talk:
1. What is gRPC?
2. Problems with REST and how gRPC can solve them
3. When to use gRPC over REST
4. Comparison to other communication technologies
5. Demo
6. Conclusion

The Cloud Native Era has changed a lot about what we expect from our applications making it challenging for traditional server side Java technologies. This talk will introduce you to Quarkus, a Kubernetes native Java stack that can tailor your application for GraalVM & Hotspot providing amazingly fast boot times and incredibly low RSS memory usage, making Java more than relevant in this brave new world.

Breaking news: You no longer need a PhD in quantum physicist to write Java that breaks the sound barrier! Join us live tonight and we are going to walk you through writing supersonic subatomic java with Quarkus!

Georgios and Ioannis are going to deliver a “deep dive” session into Quarkus structured into two ‘self-contained’ parts. The first part is going to cover application development essentials. The second part is going to be about cloud and integration

Please download the following before attending: https://github.com/iocanel/java2days-sofia-2019#Requirements

Take your first steps to understanding and start working with stream processing! By the end of the course, you will be able to build and run distributed streaming pipelines in Java:

• Explain when to use streaming
• Design a streaming application from the building blocks
• Transform, match, correlate and aggregate continuous data
• Scale, deploy, and operate streaming apps

We will also cover the advantages and disadvantages of the stream processing technologies available when approaching real-world problems.

Slides

Christian is creating the environment to develop, innovate and truly collaborate at Zühlke Engineering in Munich. He comes from a software development and architecture background. Currently, he does a lot of interesting things: team leadership – being responsible for the team in Munich and building up our team in Sofia. Christian is constantly thinking how to improve the way his teams work together. He is also consulting clients on how to get going with innovation, and how to adopt agility and technology on the way.

Microservices have saved us from the crushing pain of monoliths, only to raise a whole raft of questions about how microservices can work together to achieve meaningful features for end users.

One approach promoted by some famous names (LinkedIn, Netflix etc.) is to adopt a message driven architecture. This talk will introduce message driven architecture and discuss some of the advantages, risks and how to mitigate them, as well as some patterns which can help you take full advantage of the shift. We’ll also touch on Tide’s experience of moving to messaging as part of scaling up our development organization.

Eclipse MicroProfile provides specifications for the most commonly used microservice patterns. This session presents a group of patterns that will be in explained and demoed live in a down-to-earth and easily understandable way. Patterns covered include Service per Container, Externalized Configuration, Health Check API, Application Metrics, Circuit Breaker, Access Token, Distributed Tracing. There will be live coding and demo of all technologies implementing the patterns.

Slides

How can you make different pieces of your unit of work consistent in the distributed setup of your micro-service application?
You associate the term transaction probably with a database, but the data source can be anything including a database in the micro-service world.
The MicroProfile Long Running Actions specification is based on sagas and the OASIS LRA transaction model specification. It defines the framework to guarantee the eventual consistency requirement using compensating actions for example.
This session will explain you the challenges and concepts of the MP LRA framework. And of course, you can see it in action with various demos.

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Integration testing is always a difficult area. You need to make sure that all system are connected, data is correctly initialised for each run and test runs do not interfere with each other.
You can do integration testing today, but sometimes these tests are flaky for various reasons or they cannot cover all the cases that you would like to test.
With the Testcontainers project, this issue can be a thing of the past. It allows you to create reliable integration tests covering a wide range of scenarios like database usages, micro services interaction and GUI testing. One of the important factors for the success of this framework is the usage of Docker containers to create a reproducible environment for the test.

This presentation shows you the basics of Testcontainers and within demos gives you examples of testing database integration, microservices integration and testing the UI with Selenium.

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If you have been on a Java conference in the past several years, there is no way you haven’t heard about Reactive. This talk is a case study of the project I have been working on during the past year (and a half). It will show you our journey through a new framework, technology, and mindset. Because, as everybody will tell you, Reactive requires a different mindset. In the end, you will, hopefully, get a better idea of what Reactive is and for what it is good or bad.

Microservices have saved us from the crushing pain of monoliths, only to raise a whole raft of questions about how microservices can work together to achieve meaningful features for end users.

One approach promoted by some famous names (LinkedIn, Netflix etc.) is to adopt a message driven architecture. This talk will introduce message driven architecture and discuss some of the advantages, risks and how to mitigate them, as well as some patterns which can help you take full advantage of the shift. We’ll also touch on Tide’s experience of moving to messaging as part of scaling up our development organization.

Do your customers keep complaining about bugs in your software application? Does it take you too long to fix bugs and implement new features? If yes, then you may have issues with the quality of your application. This session provides practical advice on how you can improve the quality of your software application. The speaker shares with you all the lessons he learned while working as a software engineer for a big, complex enterprise application, discussing which techniques worked and which ones failed and providing actual examples and metrics from that application. It’s assumed that you have already experienced the struggle of maintaining a defective software application and that you aspire to building software of top quality.

Slides

Typical microservices environment consists of many services. In order to provide business value, they need to cooperate. Therefore, it is crucial to ensure that the services are always able to communicate with each other. What if by accident a developer introduces a change to one service, which will make inter-service communication impossible? It is necessary to prevent such situations from happening. Therefore, HL Tech developed an open source project called Judge-d. Judge-d verifies if a change introduced to a service would pose a threat to communication within any environment.

In my presentation I briefly discuss threats to communication in microservices environment, contract testing as a typical solution and how Judge-d realizes contract testing. I describe how REST and JMS contracts are represented in Judge-d. I will present possible alternatives and their disadvantages as well.

Everybody needs caching! However, where exactly to place it in your system? Inside your application or as a layer in front of it? Inside or outside the container? In the era of Cloud Native and Microservices these questions get even more complicated. In this session I’ll present different architectural patterns for distributed caching: Embedded, Client-Server, (Kubernetes) Sidecar, and Reverse HTTP Proxy Caching.

During this talk you’ll learn:
– What are the design options for including the caching layer
– How to apply caching layer in Istio (and Service Mesh in general)
– How to use distributed HTTP caching without updating your microservices
– Common pitfalls when setting up caching for your system

Slides

The sensitive nature of genetic data causes a major concern in genetics – a lot of life-saving information, despite having been collected, is inaccessible. Data discovery and sharing has long been believed to be the key making new breakthroughs.

In this session, we tell the story of developing a standard for search of genetic data and its implementation in the form of the world’s largest search and discovery engine of human genetic data today. The effort is a result of years of collaboration between developers, researchers and scientists on a global scale, and the flagship project of the Global Alliance for Genomics and Health, a coalition of over 500 institutions focused on standardizing sharing of genetic data.

We’ll go from challenges, architecture and technologies behind this open-source project, through the development of a standard for genetic data search, to fun statistics capturing what people are searching for in the system.

Come and learn about the technical decisions that allowed us to scale and disrupt the perception of genetic data!

When Java 8 was first introduced, it revolutionized the way Java applications were written by providing the core constructs for asynchronous programming and handling data streams. With Java 9-12, these capabilities were extended to the level that allows us to write truly modern, reactive applications with the JDK.

In this live-coding session, we explore the building blocks or reactive systems available in the JDK today, which create 8 levels of reactive programming. We specifically focus on JDK 9-12 features, such as updates to the Stream and CompletableFuture APIs, Reactive Streams publish-subscribe framework, HTTP/2 client, and more.

Many modern world software systems face the need to process increasing volumes of data in a reasonable amount of time. To achieve that one can think of different ways to build a highly-scalable data pipeline which is a non-trivial activity especially in terms of the different operations, performance through various optimizations and scalability that need to be taken into consideration during the implementation. In order to avoid that we typically fall back to a framework like Apache Spark that provides the necessary primitives to build such a data pipeline. During this topic we will demonstrate how does Apache Spark achieves that by implementing a realtime event management system that aggregates events from a number of data sources in a single application implemented with the help of Apache Spark.

Software Engineering is undoubtedly one of the best-paid jobs nowadays, which implies that the market for Software Engineers is large enough for all levels of expertise.

However, when a market is large it’s not always that easy to find good engineers; because in the end, this is what companies want, exceptional engineers.

Are you happy enough with your current position? Do you often find yourself in dilemmas like “am I doing the right thing?”, “how can I improve my skills?”, “how could I be seen as a strong technical person?” ?
Besides answering the aforementioned questions, this session will actually help you to drive your career in the direction you want, improve your productivity and make the right decisions at the right time.

The EU increases its cooperation on cyber defense to strengthen its resilience to cyber-attacks through the EU Cybersecurity Act and certification of products, services or applications. To be as well prepared as possible against hacker attacks or the distribution of “fake news”, fake documents and information. Like a One Trillion Amazon refund or fake tax returns. The IT industry may use this mechanism to certify products like connected vehicles, government services or smart medical devices. Due to its platform independence, Java plays an important role, especially in web, cloud or enterprise environments.

This session introduces the DSS Framework and solutions based on it, such as Digidoc4J. DSS (Digital Signature Services) is a Java framework for the creation and validation of electronic signatures. DSS supports the creation and validation of interoperable and secure electronic signatures in accordance with European legislation, in particular the eIDAS Regulation, as well as IT standards like OASIS DSS.
The framework may be used anywhere from embedded devices to desktop applications, like practice management software or services in the cloud wherever a JVM runs. It supports a variety of document formats like XML, PDF, Word, Plain Text or compressed archives, as well as various digital signatures, including XAdES, CAdES, PAdES or ASiC. It provides an abstraction layer over low-level signature libraries like Bouncy Castle, OpenPDF, Apache PDFBox or Sanctuario. DSS is used in many European countries for document exchange and security, e-health or e-government, with digital ID cards in more than a dozen countries across the European Economic Area.
An overview of the DSS Framework is followed by a live demo, showing how different documents can be signed and their signature subsequently verified.

Slides

Jakarta NoSQL is the first specification of the new era of Java EE now in the Eclipse Foundation home as Jakarta EE. The goal of this specification is to ease integration to Java applications with a standard API that supports more than 30 NoSQL vendors and rising. This presentation will show Jakarta NoSQL with MongoDB and introduce an easy way to move your application to the cloud age.

In this talk Dr. Svetlin Nakov will review the biggest cybersecurity threats for the modern mobile devices and will demonstrate how easily an Android mobile phone can be hijacked by non-professional attacker, using trivial remote administration tools and screen recording apps from the official Android app store. Finally, the speaker will give recommendations and best practices for improving the security of iOS and Android mobile devices.

There is a joke. A fireman is complaining, “What the hell, each and every time people call us to say that their house is on fire”. As a solution architect in DataArt, I can say that 80% of my job is to help different companies to solve problems with their systems. So, when I see a project, it is usually “on fire”. Sometimes problems lie with requirements, sometimes with management, sometimes they are caused by a wrong choice of tools. But lots of problems lie with the technical architecture. I want to discuss with you several most typical problems in the technical architecture that I have seen in more than half of the projects.

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‘Effective Java’ is probably the best book ever written for Java programmers. It presents the most effective ways of using language. Since Groovy and Kotlin run on JVM, most of the suggestions from Effective Java are equally relevant for Groovy and Kotlin developers. However, one has to take caution before using the corresponding Java implementations. Moreover, these languages provide out of the box constructs for many of the recommended practices which can boost developer productivity.

In this talk, I walk you through code examples that follow these good practices, highlighting the Groovy and Kotlin way of implementing the ‘Effective Java’ suggestions. There are several instances where Groovy and Kotlin take different approaches. As a participant, you walk away appreciating the simplicity with which these JVM languages empower the developers. The talk also provides food for thought – how programming languages can influence their users to adopt good practices.

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Poker Hands are are put into sequential order and the player who holds the highest one wins. Let’s make fun of it then and perform some refactoring of code that identifies what poker figure given player holds. We will transform a set of nested if-else statements into a nice chain of responsibility classes (Straight Flush, Four of a Kind, Full House, …) . This way the chain of classes put into sequential order will figure out the score given player holds. Proxy design patterns will come into the picture as well. All I can promise during this refactoring workshop is definitely no bluffing – just pure focus on code transformations. BTW : Did you know that real poker players are bluffing very rarely…? Prerequisite : become acquainted with poker rules if you haven’t played it so far, as business perspective and understanding existing code is the initial step for any refactoring. And don’t forget to install IntelliJ IDE – our master refactoring tool!

Please download the following sources prior to attending the Master Class: https://github.com/wlodekkr/chain-of-responsibility

Everyone has heard about test pyramid… and refactoring pyramid is its twin. Using Pyramid of testing we can set up the tests coverage of the existing functionality reaching given level (UI, modules, packages, classes, methods). This allows us to have a look at corresponding pyramid of refactoring and figure out what kind of refactorings can be performed safely. We start from the bottom of refactoring pyramid (simpler conditions, smaller methods) and climb up towards the highest level that is covered by tests.

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Kotlin gives us a lot of possibilities, but with every power comes responsibility. What should we avoid doing in Kotlin? What are Kotlin internal contracts in terms of different features and functions? What is dangerous and should be avoided? How to code responsively?

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Learn how to make your first truly multiplatform project and explore how much these capabilities can save you time and effort during everyday work. During this presentation, we will take a step-by-step approach, and by exploring what needs to be done to make more and more advanced usage possibilities, we will discover how to start and how to operate on multiplatform Kotlin projects.

Slides

Contemporary applications often employ the usage of distributed services that work together to allow complex workflows.
The notion of many services with different lifecycles and different availability poses great challenges to a centralized user interface.
What should the design of such front end be? How should it stitch up the different pieces together?
How would it react to change and downtime for each service individually and for the bulk of them?

This presentation aims to give a quick overview of what micro frontends are and how they are applied in various applications like Facebook, Spotify and such as the VMware’s vSphere Suite.