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Business Agility Through DevOps and Continuous Delivery

The principles of Continuous Delivery and DevOps have been around for a few years. Developers and system administrators who follow the lean-startup movement are more than familiar with ...
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Observer Design Pattern in Java

‘Don’t call us, we’ll call you’… that’s the Hollywood OO (Object Oriented) Principle and it’s exactly what the Observer pattern is about. In ...
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Java Code Quality Tools – Overview

Recently, I had a chance to present the subject at the local IT community meetup. Here is the basic presentation: Java Code Quality Tools    and more ...
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Spring Security using API Authentication

Background While there are many blog posts that detail how to use Spring Security, I often still find it challenging to configure when a problem domain lies outside of the standard ...
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Testing Custom Exceptions with JUnit’s ExpectedException and @Rule

Exception Testing Why test exception flows? Just like with all of your code, test coverage writes a contract between your code and the business functionality that the code is supposed ...
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Log4j Thread Deadlock – A Case Study

This case study describes the complete root cause analysis and resolution of an Apache Log4j thread race problem affecting a Weblogic Portal 10.0 production environment. It will also ...
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JUnit Pass Test Case on Failures

Why create a mechanism to expect a test failure? There comes a time when one would want and expect a JUnit @Test case fail. Though this is pretty rare, it happens. I had the need to ...
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Does Immutability really means Thread Safety?

I have often read articles telling “If an object is immutable, it is thread safe”. Actually, I have never found an article that convinces me that immutable means thread safety. ...
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MapReduce: Working Through Data-Intensive Text Processing

It has been a while since I last posted, as I’ve been busy with some of the classes offered by Coursera. There are some very interesting offerings and is worth a look. Some time ago, ...
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Test Driven Traps, part 1

Have you ever been in a situation, where a simple change of code, broke a few hundred tests? Have you ever had the idea that tests slow you down, inhibit your creativity, make you afraid ...
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