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Spring Rest API with Swagger – Creating documentation

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The real key to making your REST API easy to use is good documentation. But even if your documentation is done well, you need to set your company processes right to publish it correctly and on time. Ensuring that stakeholders receive it on time is one thing, but you are also responsible for updates in both the API and documentation. ...

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Clean Unit Test Patterns – Presentation Slides

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I was given the opportunity to talk at the GDG DevFestKarlsruhe 2014 conference about ‘Clean Unit Test Patterns’. Thanks to the organizers for inviting me and thanks to all people listening to my talk. As promised I shared the presentation e.g. for those who want to have a look at the additional slides I did not cover during the talk: ...

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Apache Commons IO Tutorial: A beginner’s guide

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Apache Commons IO is a Java library created and maintained by the Apache Foundation. It provides a multitude of classes that enable developers to do common tasks easily and with much less boiler-plate code, that needs to be written over and over again for every single project.The importance of libraries like that is huge, because they are mature and maintained by ...

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ZooKeeper on Kubernetes

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The last couple of weeks I’ve been playing around with docker and kubernetes. If you are not familiar with kubernetes let’s just say for now that its an open source container cluster management implementation, which I find really really awesome. One of the first things I wanted to try out was running an Apache ZooKeeper ensemble inside kubernetes and I ...

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Chronicle Map and Yahoo Cloud Service Benchmark

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Overview Yahoo Cloud Service Benchmark is a reasonably widely used benchmarking tool for testing key value stores for a significant number of key e.g 100 million, and a modest number of clients i.e. served from one machine. In this article I look at how a test of 100 million * 1 KB key/values performed using Chronicle Map on a single ...

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Spring Boot Actuator: custom endpoint with MVC layer on top of it

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Spring Boot Actuator endpoints allow you to monitor and interact with your application. Spring Boot includes a number of built-in endpoints and you can also add your own.   Adding custom endpoints is as easy as creating a class that extends from org.springframework.boot.actuate.endpoint.AbstractEndpoint. But Spring Boot Actuator offers also possibility to decorate endpoints with MVC layer.   Endpoints endpoint There ...

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Securing WebSockets using Username/Password and Servlet Security

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RFC 6455 provide a complete list of security considerations for WebSockets. Some of them are baked in the protocol itself, and others need more explanation on how they can be achieved on a particular server. Lets talk about some of the security built into the protocol itself:               The Origin header in HTTP request ...

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Grails Generate Asynchronous Controller

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Since version 2.3, Grails supports asynchronous parallel programming to support modern multiple core hardware. Therefore a new Grails command is added to generate asynchronous controllers for domain classes. The generated controller contains CRUD actions for a given domain class. In the example below, we will generate a default asynchronous implementation of a Grails controller. First we create a domain object: ...

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Testing your plugin with multiple version of Play

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So, you’ve written a plugin for Play…are you sure it works? I’ve been giving Deadbolt some love recently, and as part of the work I’ve added a test application for functional testing. This is an application that uses all the features of Deadbolt, and is driven by HTTP calls by REST-Assured. Initially, it was based on Play 2.3.5 but this ...

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