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Java/Kotlin Unit Testing – Test Stdout/Stderr/Logs

Java/Kotlin Unit Testing – Test Stdout/Stderr/Logs

Note: see also my old blog post if you want a more complex solution 😉 It targets at replacing the log appender. The below described method is simpler (nice!), it just listens in on ALL standard output+errors. When using spring-boot unit testing (library spring-boot-test-2.6.2.jar or newer), you can capture the output as send to the standard out and standard error channels. This allows for example testing output to log statements (by sending logs to stdout / console appender). From the…

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Maven Version Plugin Automatic Updates

Maven Version Plugin Automatic Updates

Whenever you edit a Java/Kotlin maven project, you should see if you need to update any used libraries. For this purpose, I have a bash alias command which runs the next three statements in a row: The full alias line looks like this (in ~/.bash_aliased) Note: it seems the plug-in is not perfect 😉 Sometimes it does major updates, even if you ask it not to. So always carefully look at the changes which are made! The URL as used…

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Lombok SonarQube Config

Lombok SonarQube Config

To skip code which is generated by Lombok in the SonarQube code checks, create a file “lombok.config” in your Java/Kotlin maven project, with these two lines in it: The addLombokGeneratedAnnotation setting does the trick…

Netty Cache Thread Memory Issues

Netty Cache Thread Memory Issues

When running spring-boot using netty (we ran: 4.1.69), and async code, your server might run into a memory issue after running for a while. In our case we were using spring-cloud-gateway (we ran: 3.0.5), and after two weeks of running, we started hitting long garbage collection times. To get around this, we did multiple code fixes, amongst one was disabling the thread-local caches for non-netty threads. To do this, add JVM option: For an explanation, see: https://github.com/spring-projects/spring-framework/issues/21174 Quote: The PooledByteBufAllocator…

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Fast Character Replace Contest

Fast Character Replace Contest

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At the office, we have quite a bunch of Java developers. However, because we are quickly growing (way, way, way too quick in my opinion), there was an intake exam created, as part of sourcing in new Java coders from external companies. One of the questions on the intake was an interesting one, so we took it upon ourselves (the existing oldies) to try creating not the most beautiful, but the FASTEST way to get the job done 😉 See…

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