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Don’t Miss out on Writing Java 8 SQL One-Liners with jOOλ or jOOQ

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More and more people are catching up with the latest update to our platform by adopting functional programming also for their businesses. At Data Geekery, we’re using Java 8 for our jOOQ integration tests, as using the new Streams API with lambda expressions makes generating ad-hoc test data so much easier. However, we don’t feel that the JDK offers as ...

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Six Tips for Interviewing Scrum Masters, Part 1

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People want to know the “secret sauce” for hiring Scrum Masters and agile coaches. I wish it was easy to provide a standard set of questions. Because your agile team is unique, your questions should be different. However, there are some common qualities, preferences, and non-technical skills among Scrum Masters. First, do a job analysis for your Scrum Master. I ...

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Jar Hell made Easy – Demystifying the classpath with jHades

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Some of the hardest problems a Java Developer will ever have to face are classpath errors: ClassNotFoundException, NoClassDefFoundError, Jar Hell, Xerces Hell and company. In this post we will go through the root causes of these problems, and see how a minimal tool (JHades) can help solving them quickly. We will see why Maven cannot (always) prevent classpath duplicates, and ...

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Kafka Benchmark on Chronicle Queue

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Overview I was recently asked to compare the performance of Kafka with Chronicle Queue.  No two products are exactly alike, and performing a fair comparison is not easy.  We can try to run similar tests and see what results we get. This test is based on Apache Kafka Performance Results.         What was the test used? One ...

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How to connect to MongoDB from a Java EE stateless application

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In this post I will present how to connect to MongoDB from a stateless Java EE application, to take advantage of the built-in pool of connections to the database offered by the MongoDB Java Driver. This might be the case if you develop a REST API, that executes operations against a MongoDB. Get the Java MongoDb Driver To connect from Java to ...

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Reducing the frequency of major GC pauses

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This post will discuss a technique to reduce the burden garbage collection pauses put on the latency of your application. As I have written couple of years ago, disabling garbage collection is not possible in JVM. But there is a clever trick that can be used to significantly reduce the length and frequency of the long pauses. As you are ...

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Dead simple configuration

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Whole frameworks have been written with the purpose of handling the configuration of your application. I prefer a simpler way. If by configuration we mean “everything that is likely to vary between deploys“, it follows that we should try and keep configuration simple. In Java, the simplest option is the humble properties file. The downside of a properties file is ...

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Akka Notes – Actor Logging and Testing

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In the first two parts (one, two), we briefly talked about Actors and how messaging works. In this part, let’s look at fixing up Logging and Testing our TeacherActor. Recap This is how our Actor from the previous part looked like :           class TeacherActor extends Actor { val quotes = List( "Moderation is for cowards", ...

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Visualizing engineering fields

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Civil engineering.                         Mechanical engineering.       Electronic engineering.       Software engineering.       Summary. Seriously, software engineering? Photo credit attribution. Image Clemuel Ricketts House drawing 1 courtesy of wikimedia. Image Bequet-Ribault House Transverse Section with Details courtesy of wikimedia. Image Grand Central Terminal courtesy ...

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