About Jakub Holy

Jakub is an experienced Java[EE] developer working for a lean & agile consultancy in Norway. He is interested in code quality, developer productivity, testing, and in how to make projects succeed.

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The Sprinting Centipede Strategy: How to Improve Software Without Breaking It

Our code has been broken for weeks. Compiler errors, failing tests, incorrect behavior plagued our team. Why? Because we have been struck by a Blind Frog Leap. By doing multiple concurrent ...
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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 use it over SSH to monitor (or even profile, using its sampler) ...
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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 Iterate Code Camp 2012, working together on a project and learning programming ...
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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 because the code depends on external data/functionality without making it possible ...
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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 here it is. You will learn how to do the elementary ...
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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 to copy & paste from the prod configuration into the Vagrant’s ...
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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 could be). This post summarizes how you can create your own JavaEE-compliant ...
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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 easiest solution was to use an embedded, ligthweight HTTP server so that the users could ...
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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 assess and test the performance of the application being developed while ...
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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 to the system painful and slow – up to the ...
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