When your Java application wants to communicate with a server that used self-signed certificate, you get very often a javax.net.ssl.SSLHandshakeException, because the validation of self signed public key fails. It is possible to ignore this validation. But this is not recommended because of it simplifies a …

In this blog post, I'd like to show how to integrate Testcontainers in Spring Boot tests for running UI tests with Selenium. Why Testcontainers? Testcontainers is a library that helps to integrate infrastructure components like Selenium or databases in integration tests based on Docker Container. It helps to avoid …

During working with GitLab multi-project pipelines and parent-child pipelines, I have encountered the problem how to pass variables through these pipelines. The GitLab documentation describes very well how to pass variables to a downstream pipeline. My challenge is how to pass variables from child to parent pipeline …

Sometimes you have to work on different projects that are hosted on different Git management systems (GitHub, Gitlab, BitBucket, Gitea). The classical scenario is that you work on open source projects that are hosted on GitHub and on enterprise projects that are hosted on an own Git management system. These projects …

Thanks Jenkins Maven HPI Plugin, you can do the most Jenkins plugin development stuff locally. But in some cases, you have to debug a Jenkins instance remotely (In my case, the Jenkins had to run in Azure to reproduce a bug). Jenkins is a Java application, so you have to add Java's JDWP agent for debugging as Java …

Some days ago, I passed my CKAD (Certified Kubernetes Application Developer) exam. In this post I'd like to share the resources, that I used for my preparation. I started with reading the book Kubernetes in Action, First Edition to understand the concept of Kubernetes (k8s) under the hood. It gave me a deep dive in …

During the development of the P2 Maven Plugin, I wanted to get an overview about the test coverage of the code. The tests of this plugin can be divided in two groups: Unit tests, that is written with Java, Groovy and JUnit; integration tests, that is written with Maven Invoker Plugin JaCoCo is the defacto standard …

Some years ago I write a blog post about how to generate test reports in SonarQube separate in test report for unit tests and for integration tests. Since SonarQube 6.2 the test report isn't separate in these categories any more (see SonarQube's blog post). SonarQube merges all test reports to one test report with an …

In this blog post I'd like to demonstrate how I integrate Testcontainers in Spring Boot tests for running integration tests with a database. I'm not using Testcontainers' Spring Boot modules. How it works with them, I will show in a separate blog post. All samples can be found on GitHub. Why Testcontainers? …

Some weeks ago, I gave a workshop about Ansible and I was asked how to set up a local test environment for Ansible. Requirement is that this test environment can run on a Windows 10 without a Linux subsystem. I don't why, but it was not my first customer where Windows 10 could not be used with Linux subsystem (Don't …