David Vlijmincx
Developer @ Team Rockstars
Eindhoven, The Netherlands
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I’m a software developer at Team rockstars IT who loves to use and find new techniques and pragmatically apply them.
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Build a web scraper based on virtual threads
Java 21 releases virtual threads into the wild! During this lab, you are going to build a web scraper that shows you the power of these new threads!
You will be guided through the step-by-step process of developing a web scraper that uses virtual threads, structured concurrency, and scoped values. You will learn how to leverage the advantages of virtual threads to efficiently retrieve and process data from lots of web pages simultaneously.
During the workshop, you may also be led astray so that you can also see when virtual threads don't work and how you can configure and debug them.
Things i wish i knew before i started writing unit tests
How am I ever going to test this method? If you are like me, you probably asked yourself this question far too often. Because a method forces you to create an enormous test case, have lots of setup code, or worse, change production code to facilitate testing.
So, what if we could write loosely coupled tests? What if our tests are clear, show intent and are fun to write? With Junit5 and Mockito you can write those tests. These tools offer many features that help you write tests but are rarely used. In this talk, I will demonstrate how to test an application with zero test coverage, hard-to-test production code, and lots of edge cases. Furthermore, I'll provide some practical advice to improve your tests and make them easier and more fun.
Introduction and pitfalls of Java's new concurrency model
Java 21 releases one of the most anticipated features, virtual threads, and previews structured concurrency. It rethinks the way multithreading works in Java. It was born out of the idea that reactive Java is too complicated and blocking threads has to be cheap. Resulting in the new virtual threads that we run thousands of!
The aim of virtual threads and structured concurrency is to have high-throughput lightweight threads and new programming models on the Java platform. In this talk, I will demonstrate virtual threads and how to create and manage them using structured concurrency. Furthermore, I'll provide some practical advice to avoid pitfalls when you start using virtual threads in your application.
David Vlijmincx
Developer @ Team Rockstars
Eindhoven, The Netherlands
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