About a month ago, I had the pleasure of taking a tutorial led by the fantastic Brendan Gregg on creating FlameGraphs using the Linux perf toolset. I recommend reading his many blog posts on the subject, but in short: while perf is an excellent resource f...

Java and the JVM more generally are widely used for services everywhere, but often challenging to debug and manually test, particularly in… (more…)

This gets interesting when you find your way into a mail server, says dev who found it... (more…)

I think the first thing we should discuss is: what is an exception. In a short definition: an exception is a notification of an execution error occurrence.What kind of errors can occur: programming errors and system failure.Wait! How is a programming erro... (more…)

The release of Java SE 15 in Sept 2020 will introduce "sealed classes" (JEP 360) as a preview feature. A sealed class is a class or interface which restricts which other classes or interfaces may extend it. Sealed classes, like enums, capture alternative... (more…)