Core Java
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Quo Vadis JUnit
For me JUnit is the most important library of the Java universe. But I think a new version of it…
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When a String is Null but Not Null
Introduction A junior programmer on my team at work had an interesting bug. Its symptoms I have seen more than…
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How to Use Callable and FutureTask
Introduction Since Java 1.5 there has been a new set of objects under java.util.concurrent. This package has a number of…
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Explore Git Internals with the JGit API
Have you ever wondered how a commit and its content is stored in Git? Well, I have, and I had…
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Let’s Stream a Map in Java 8 with jOOλ
I wanted to find an easy way to stream a Map in Java 8. Guess what? There isn’t! What I…
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Why to use String
Recently I was tutoring juniors during a training session. One of the task was to write a class that can…
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Java Extension Mechanism Loads All JARs
The Java Extension Mechanism is described in the Java Tutorial as a “standard, scalable way to make custom APIs available…
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Supercharged jstack: How to Debug Your Servers at 100mph
A guide for using jstack to debug live Java production servers jstack is like U2 – it’s been with us since the…
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Revealing the length of Garbage Collection pauses
There are several ways to improve your product. One such way is to carefully track what your users are experiencing…
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