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Spring Data JPA Tutorial: Introduction

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Creating repositories that use the Java Persistence API is a cumbersome process that takes a lot of time and requires a lot of boilerplate code. We can eliminate some boilerplate code by following these steps:                 Create an abstract base repository class that provides CRUD operations for entities. Create the concrete repository class ...

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Can MicroServices Architecture Solve All Your Problems?

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IT is one field where you can find new things coming everyday. Theses days the whole developer community websites are flooded with MicroServices and Docker related stuff. Among them the idea of MicroServices is very exciting and encourages better way of building software systems. But as with any architectural style there will be pros and cons to every approach. Before ...

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What I look for in frameworks

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In every project the discussion comes up over and over again: should we use framework X? or Y? or no framework at all? Even when you limit yourself to the frameworks for web development in the Java space the choices are so plentiful, nobody can know them all. So I need a quick way do identify which frameworks sound promising ...

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Spark: Write to CSV file with header using saveAsFile

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In my last blog post I showed how to write to a single CSV file using Spark and Hadoop and the next thing I wanted to do was add a header row to the resulting row. Hadoop’s FileUtil#copyMerge function does take a String parameter but it adds this text to the end of each partition file which isn’t quite what ...

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Developing with WSO2

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Since a few months I am back working with WSO2 products. In the upcoming posts I describe some of the (small) issues I ran into and how to solve them. The first thing I did when setting up my development environment was downloading the Developer Studio (64-bit version) on my Mac. After unzipping the downloaded zip file you see the ...

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The New Agile–The beginning

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Frequent readers of this blog know I’m a big proponent of agile, with a small ”a”. I tend to scoff at new big ideas that seem to jump out of a marketing committee. Truth is, sometimes these are good ideas. Sometimes they are first versions of trials and errors. When we look at them at the current stage they may ...

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ReactiveMongo with Akka, Scala and websockets

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I was looking for a simple websocket server for one of my projects to test some stuff with reactive mongo. When looking around, though, I couldn’t really find a simple basic implementation without including a complete framework. Finally I stumbled upon one of Typesage activtor projects: http://typesafe.com/activator/template/akka-spray-websocket. Even though the name implies that spray is required, it actually uses websocket ...

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Continuous Deployment: Introduction

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This article is part of the Continuous Integration, Delivery and Deployment series. Continuous deployment is the ultimate culmination of software craftsmanship. Our skills need to be on such a high level that we have a confidence to continuously and automatically deploy our software to production. It is the natural evolution of continuous integration and delivery. We usually start with continuous ...

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Docker Common Commands Cheatsheet

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Docker CLI provides a comprehensive set of commands. Here is a quick cheat sheet of the commonly used commands:                     Purpose Command Build an image docker build –rm=true . Install an image docker pull ${IMAGE} List of installed images docker images List of installed images (detailed listing) docker images –no-trunc Remove an image ...

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Are recruiters generally all so bad?

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I have a friend who’s a recruiter. Yes, that can actually happen. I mentioned to him that I’d been contacted by a really annoying recruiter, and he responded with “Can I ask you a serious question? Are ‘they’ generally all so bad? I’m struggling a little to understand why there is so much bad feeling generally, towards them.”. I had ...

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