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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 once.  This post is what to look for and how to prevent it in the future.  ...
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Resource scheduling and task launching with Apache Mesos and Apache Aurora at Twitter

Episode # 23 of the podcast was a talk with Bill Farner Bill explained how Twitter, using Apache Mesos and Apache Aurora, gets more for their money for the hardware and saves engineering ...
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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 different classes including thread queues.  I could have ...
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Hibernate application-level repeatable reads

Introduction In my previous post I described how application-level transactions offer a suitable concurrency control mechanism for long conversations. All entities are loaded within ...
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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 some spare time over the last rainy weekend, so I did a little research. Because I feel ...
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Spring Boot / Java 8 / Tomcat 8 on Openshift with DIY

DIY cartridge is an experimental cartridge that provides a way to test unsupported languages on OpenShift. It provides a minimal, free-form scaffolding which leaves all details of the ...
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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 would’ve expected for convenience is the following method:                   public ...
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Neo4j: Cypher – Avoiding the Eager

  Although I love how easy Cypher’s LOAD CSV command makes it to get data into Neo4j, it currently breaks the rule of least surprise in the way it eagerly loads in all rows ...
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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 dwarwle maps based on some string key. The result one of the juniors created ...
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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 to all applications running on the Java platform.” ...
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