Java / NLJUG

J-Fall 2022: Gustaf Nilsson Kotte – Web Architecture for IKEA.com – Present/Future

IKEA.com is one of the 10th largest E-commerce websites (2021). The web architecture is based on static files, supporting both static sites and client-side JavaScript applications. Static files have democratized web development for our 50 frontend teams and allow for high availability, great web performance, and low operational cost. However, we also begin to experience […]

msmelt

December 4, 2022

23

J-Fall 2022: Haim Yadid – “Show Me the Garbage!”, Garbage Collection a Friend or a Foe

“Just leave the garbage outside and we will take care of it for you”. This is the panacea promised by garbage collection mechanisms built into most software stacks available today. So, we don’t need to think about it anymore, right? Wrong! When misused, garbage collectors can fail miserably. When this happens they slow down your […]

msmelt

December 4, 2022

14

J-Fall 2022: Hanno Embregts & Peter Wessels – Pattern Matching: Small Enhancement or Major Feature?

At first it seemed to be just a small enhancement: the addition of “Pattern Matching for instanceof” (JEP 305) in Java 14. No more unnecessary casting after an `instanceof`, that ought to save us a few seconds a day! However, upon further investigation you’ll quickly discover that pattern matching is not just an enhancement, but […]

msmelt

December 4, 2022

13

J-Fall 2022: Hanno Embregts, Jan Ouwens, Jan-Hendrik Kuperus & Julien Lengrand-Lambert

Most of us are all well aware of it: the current trend of climate change is not looking great. We can already feel some of its consequences and it is very likely to only become worse. As software developers we’re all about innovation though, so as long as we’re innovating not all hope is lost. […]

msmelt

December 4, 2022

13

J-Fall 2022: Hubert Klein Ikkink – Spice Up Asciidoctor Documentation With Java

Writing documentation is important, but often still an afterthought in projects. What if we could write documentation like we write our code? Asciidoctor is one of the solutions to fulfill this promise. We can use a markup language to write out documentation, keep it close to our source code and even reference that source code […]

msmelt

December 4, 2022

14

J-Fall 2022: Ignite Sessions

Sander Kooijmans – Write unit tests without mocks using Test Data Builders In this ignite session Sander explains how you can write unit tests that use an in-memory database per test case. Instead of using mocks to setup the data in the database Test Data Builders are used to create data in the database. David […]

msmelt

December 4, 2022

13

J-Fall 2022: Ivar Grimstad – Modern and Lightweight Cloud Application Development with Jakarta EE10

**Jakarta EE 10** is packed with new features for simple development of modern, lightweight enterprise Java applications for the Cloud. The new Jakarta EE Core Profile enables developers to develop microservices with Jakarta EE technologies with runtimes smaller than ever. Jakarta EE Core Profile even makes it possible to compile Jakarta EE applications to native […]

msmelt

December 4, 2022

19

J-Fall 2022: Jakob Löhnertz – Dekompiled

Most people run their Kotlin code on the Java Virtual Machine (JVM). But did you ever wonder about how Kotlin can be so concise, clean, and expressive to read and write compared to Java, while in the end it will just be compiled to JVM bytecode nonetheless? There must be quite some heavy lifting going […]

msmelt

December 4, 2022

18

J-Fall 2022: Jeroen Reijn – Ten things that improve the performance of your Java based AWS Lambda

More and more enterprise organizations are moving toward the Cloud or want to adopt a more cloud-native operating model. Adopting serverless compute services like AWS Lambda is high on developers’ wish lists. Most of these organizations use Java for their existing applications, but Java is known for its high cold start times and high memory […]

msmelt

December 4, 2022

22

J-fall 2022: Jeroen van der Wal – If I have to do this one more time, I quit!

You also have these moments right!? Doing the same thing for the 100th time, thinking, NOT AGAIN! Going to that same application, pressing the same buttons over and over again. Going to the same website, filling in the same data, over and over again. So… Do we really have to do this again…!?

msmelt

December 4, 2022

15