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Spark: Write to CSV file with header using saveAsFile

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 ...
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Developing with WSO2

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 ...
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The New Agile–The beginning

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 ...
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ReactiveMongo with Akka, Scala and websockets

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 ...
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Continuous Deployment: Introduction

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 ...
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Docker Common Commands Cheatsheet

Docker CLI provides a comprehensive set of commands. Here is a quick cheat sheet of the commonly used commands:                    Purpose CommandBuild ...
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Are recruiters generally all so bad?

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 ...
spring-interview-questions-answers

Avoid unwanted component scanning of Spring Configuration

I came through interesting problem on Stack Overflow. Brett Ryan had problem that Spring Security configuration was initialized twice. When I was looking into his code I spot the problem. ...
spring-interview-questions-answers

Black Box Testing of Spring Boot Microservice is so easy

When I needed to do prototyping, proof of concept or play with some new technology in free time, starting new project was always a little annoying barrier with Maven. Have to say that ...
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Converting between Completablefuture and Observable

CompletableFuture<T> from Java 8 is an advanced abstraction over a promise that value of type T will be available in the future. Observable<T> is quite similar, but it promises ...
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