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Pair Programming for Team Building

Extreme programming (XP) introduced most people to pair programming. The theory was that the sooner that code was reviewed, the more effective the review — so how much more effective ...
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How Immutability Helps

In a few recent posts, including “Getters/Setters. Evil. Period.”, “Objects Should Be Immutable”, and “Dependency Injection Containers are Code Polluters”, ...
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Have You Ever Wondered About the Difference Between NOT NULL and DEFAULT?

When writing DDL in SQL, you can specify a couple of constraints on columns, like NOT NULL or DEFAULT constraints. Some people might wonder, if the two constraints are actually redundant, ...
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Guess, don’t measure

I have lost count in how many occasions I have recommended to start all performance tuning activities by setting goals and measuring baseline instead of tuning random bits in your source ...
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Development Horror Story – Mail Bomb

Based on my session idea at JavaOne about things that went terrible wrong in our development careers, I thought about writing a few of these stories. I’ll start with one of my favourites ...
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CallSerially The EDT & InvokeAndBlock (Part 2)

The last time we talked about the EDT we covered some of the basic ideas, such as call serially etc. We left out two major concepts that are somewhat more advanced. Invoke And Block When ...
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Use reactive streams API to combine akka-streams with rxJava

Just a quick article this time, since I’m still experimenting with this stuff. There is a lot of talk around reactive programming. In Java 8 we’ve got the Stream API, we ...
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Spring boot war packaging

Spring boot recommends creating an executable jar with an embedded container (tomcat or jetty) during build time and using this executable jar as a standalone process at runtime. It ...
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EasyCriteria has evolved to uaiCriteria. New name and more features

Hello, how are you? I am very happy to announce the release of the uaiCriteria, the EasyCriteria evolution. Was it really needed to change the framework name? Yes, sadly it was. I found ...
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How to build and clear a reference data cache with singleton EJBs, Ehcache and MBeans

In this post I will present how to build a simple reference data cache in Java EE, using singleton EJBs and Ehcache. The cache will reset itself after a given period of time, and can ...
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