Category: Java

For the Open Day we organize shortly for our family, friends, neighbours and other interested parties, my colleagues create a custom web application to support our QR Scavenger Hunt …

Previously I wrote about generating random data which conforms to an AVRO schema (here). In a recent use-case, I encountered the situation where there were several separate schema files …

AVRO schema are often used to serialize JSON data into a compact binary format in order to for example transport it efficiently over Kafka. When you want to validate …

Recently I was designing an AVRO schema and wanted to test how data would look like which conformed to this schema. I developed some Java code to generate sample …

SonarCloud is a hosted SonarQube SaaS solution which helps you with code quality management. It is free to use for open source projects. You cannot install 3rd party plugins …

GitHub Actions allow you to do most CI/CD tasks for free, directly from your GitHub repository. One of the challenges however is that there is no build-in facility like …

It is often expected of a DevOps team to also take security into consideration when delivering software. Often however, this does not get the attention it deserves. In this …

You might want to change the behavior of a Java application at runtime without having to alter the original sources and recompile them. This can be done by using …

The OWASP Foundation plays an important role in helping to improve security of software worldwide. They have created a popular and well-known awareness document called the ‘OWASP Top 10‘. …

In this article, you can read more about the Quarkus code guide I tried out, related to the following topic: The ability to automatically generate Kubernetes resources by Quarkus …

In this article, you can read more about the Quarkus code guide I tried out, related to the following topic: The ability to automatically generate Kubernetes resources by Quarkus …

In this article, you can read more about the Quarkus code guide I tried out, related to the following topic: The ability to automatically generate Kubernetes resources by Quarkus …

Kubernetes is a popular platform to run and manage containerized applications. A CI/CD solution is often needed but not always provided. You might need to set this up for …

In this article a brief overview of my steps to set up an environment on my Windows 10 laptop for doing Java programming. If you follow these steps, you …

In this article, you can read more about a Quarkus code guide I tried out, related to the following topic: Packaging the native executable in a container In a …

In my previous article, I already shared with you the Quarkus code guide “Quarkus – Creating Your First Application”, I tried out, including the hot deployment with background compilation. …

In my previous article, I shared with you the steps I took, to set up a demo environment, so I could get started with Quarkus. In this article, you …

In November 2019, I attended Devoxx Belgium together with other AMIS colleagues. The yearly gathering of over 3000 Java developers (numbers provided by Devoxx website) were Java and software …

Introduction Sonarcloud is a static code analysis tool. This means that it checks out the code at your repository, does an analysis and shows you the results. It may …

Spring Framework version 5, released in Sept 2017, introduced Spring WebFlux. A fully reactive stack. In Dec 2019 Spring Data R2DBC was released, an incubator to integrate relational databases …

When running Java applications in containers, you need to be careful with your resources. If you’re not careful with layering your images (for example using Google’s Jib), you can quickly …

R2DBC provides non-blocking reactive APIs to relational database programmers in Java. It is an open specification, similar to JDBC. JDBC however uses a thread per connection while R2DBC can handle …

Apache Camel is an open source integration framework that allows you to integrate technologically diverse systems using a large library of components. A common use-case is to service HTTP based endpoints. …

Performance tuning usually goes something like followed: a performance problem occurs an experienced person knows what is probably the cause and suggests a specific change baseline performance is determined, …

I attended Devoxx Belgium – November 2019. The yearly gathering of over 3000 Java developers (numbers provided by Devoxx website). Maybe not all of them Java and perhaps some …

Syslog is a standard for message logging, often employed in *NIX environments. It allows separation of the software that generates messages, the system that stores them, and the software that …

Interoperability from Java to JavaScript has been an objective for the Java community for quite a while. With Rhino and later Nashorn, two valiant attempts were made to add …

There are different ways to create data services. The choice for a specific technology to use, depends on several factors inside the organisation which wishes to realize these services. …

When developing microservices, a fast startup time is useful. It can for example reduce the amount of time a rolling upgrade of instances takes and reduce build time thus …

Sometimes you have multiple services you want to call at the same time and merge their results when they’re all in (or after a timeout). In Enterprise Integration Patterns …

Sometimes you have an Oracle database which contains a lot of logic and you want to expose specific logic as REST services. There are a variety of ways to …

It is a smart thing to move to newer versions of Java! Support such as security updates and new features are just two of them but there are many …

In a previous article, I talked about an environment, I prepared on my Windows laptop, with a guest Operating System, Docker and Minikube available within an Oracle VirtualBox appliance. …

Last November, I attended the Devoxx Belgium 2018 event. In this article I gathered some practical information about the event, and the sessions that were held. Perhaps this gives …

In a previous blog post I created a setup to compare JVM performance of several JVMs. I received some valuable feedback on the measures I conducted and requests to …

There are many different choices for a JVM for your Java application. Which would be the best to use? This depends on various factors. Performance being an important one. …

In order to compare the performance of different JDKs for reactive Spring Boot services, I made a setup in which a Spring Boot application is wrapped in a Docker …

GraalVM is an open source polyglot VM which makes it easy to mix and match different languages such as Java, Javascript and R. It has the ability (with some …

TL;DR: •    Using GraalVM Java applications can be compiled into native standalone executables (will be demonstrated). •    Native executables of small Java programs startup blazingly fast, use considerably less …

Running an application within a Docker container helps in isolating the application from the host OS. Running GUI applications like for example an IDE from a Docker container, can …