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JUnit 5 (JUnit Jupiter) is around for quite some time already and it is equipped with tons of features. But surprisingly JUnit 5 it is not a default test library dependency when it comes to the Spring Boot Test Starter: it is still JUnit 4.12, released back in 2014. If you consider using JUnit 5 in you next Spring Boot ...

Microservice architectures are not free lunch! Microservices need to be decoupled, flexible, operationally transparent, data aware and elastic. Most material from last years only discusses point-to-point architectures with tightly coupled and non-scalable technologies like REST / HTTP. This blog post takes a look at cutting edge technologies like Apache Kafka, Kubernetes, Envoy, Linkerd and Istio to implement a cloud-native service ...

Think Serverless, go Pythonic – all in your browser! (Okay, this news is several weeks stale, but still…) If you are into this whole serverless “thing”, you might have noticed us, a notorious bunch at SLAppForge, blabbering about a “serverless IDE”. Yeah, we have been operating the Sigma IDE – the first of its kind – for quite some time ...

Here we are again with another version of JMetro. New additions in this version: New style for controls inside ToolbarNew editable ComboBox styleSome tweaks to other stylesSome fixes Keep on reading for details. Editable ComboBox New Style The editable ComboBox of previous versions of JMetro looked quite bad, mostly because, well, they didn’t actually have a defined style. Below you ...

Disclaimer: This is my personal opinion and does not represent the view of my employer. By now everyone know that we need to rename all javax package names to something else due to the move from Oracle to the Eclipse Foundation. (For reference see Appendix A) At the moment the discussion is basically, should we do this rename all at ...

In this article, we implement the Infinite scroll feature in a ReactJS application. This feature allows us to load and present additional content as the user scrolls the container. It creates an impression of seemingly infinite content and thus the name infinite scroll. In this article, we will create a container that, when scrolled would load additional content into the ...

Pub/Sub is a nice tool provided by GCP.  It is really handy and can help you with the messaging challenges you application might face. Actually if you work with GCP it is the managed messaging solution that you can use. As expected working with the actual Pub/Sub solution comes with some quota, so for development it is essential to use ...

Introduction Sometimes, as a developer, you may bump into a situation when it’s not possible to instantiate an object using the new operator because its class name is stored somewhere in configuration XML or you need to invoke a method which name is specified as an annotation property. In such cases, you always have an answer: “Use reflection!”. In the ...

Introduction Almost any system operates with external data stores in some way. In most of the cases, it is a relational database and very often data fetching is delegated to some ORM implementation. ORM covers a lot of routine and brings along a few new abstractions in return. Martin Fowler wrote an interesting article about ORM and one of the ...