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Spring RestTemplate with a linked resource

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Spring Data REST is an awesome project that provides mechanisms to expose the resources underlying a Spring Data based repository as REST resources. Exposing a service with a linked resource Consider two simple JPA based entities, Course and Teacher:           @Entity @Table(name = "teachers") public class Teacher { @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name = "id") private ...

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Spark: Write to CSV file

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A couple of weeks ago I wrote how I’d been using Spark to explore a City of Chicago Crime data set and having worked out how many of each crime had been committed I wanted to write that to a CSV file. Spark provides a saveAsTextFile function which allows us to save RDD’s so I refactored my code into the ...

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Spring request-level memoization

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Introduction Memoization is a method-level caching technique for speeding-up consecutive invocations. This post will demonstrate how you can achieve request-level repeatable reads for any data source, using Spring AOP only.         Spring Caching Spring offers a very useful caching abstracting, allowing you do decouple the application logic from the caching implementation details. Spring Caching uses an application-level ...

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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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