VisualVM: Monitoring Remote JVM Over SSH (JMX Or Not)

VisualVM is a great tool for monitoring JVM (5.0+) regarding memory usage, threads, GC, MBeans etc. Let’s see how to…

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Programming Like Kent Beck

Three of us, namely Stig, Krzysztof, and Jakub, have had the pleasure of spending a week with Kent Beck during…

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Help, My Code Isn’t Testable! Do I Need to Fix the Design?

Our code is often untestable because there is no easy way to “sense1” the results in a good way and…

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Introduction to Puppet For Vagrant Users

I couldn’t find any good, brief, practical introduction into Puppet that gives you basic working knowledge in minimal time, so…

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Serving Files with Puppet Standalone in Vagrant

If you use Puppet in the client-server mode to configure your production environment then you might want to be able…

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JBoss AS 7: Custom Login Modules

JBoss AS 7 is neat but the documentation is still quite lacking (and error messages not as useful as they…

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Exposing Functionality Over HTTP with Groovy and Ultra-Lightweight HTTP Servers

I needed a quick and simple way to enable some users to query a table and figured out that the…

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Getting Started with Amazon Web Services and Fully Automated Resource Provisioning in 15 Minutes

While waiting for a new project, I wanted to learn something useful. And because on many projects we need to…

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Principles for Creating Maintainable and Evolvable Tests

Having [automated] unit/integration/functional/… tests is great but it is too easy for them to become a hindrance, making any change…

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