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 ...
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) ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
