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Docker Tools in Eclipse


Upcoming Docker Tooling for Eclipse gave a preview of Docker Tooling coming in Eclipse. This Tech Tip will show how to get started with it. NOTE: This is pretty bleeding edge and so some of the features may be half baked. But we are looking for all the feedback! The Docker tooling is aimed at providing at minimum the same basic level ...

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Getting started with AWS IAM


Recently AWS announced that using IAM Roles with their EMR service will be mandatory as of June 30 this year. In this post I will show you how to setup the IAM basics when you are starting with AWS. When you are starting from scratch with your new AWS account then you will see the following management console. Choose the ...

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Backpressure in action with websockets and akka-streams


So in the previous article I showed how you could create a websocket server using akka-streams. In this follow up article we’ll look a bit closer on how backpressure works with websockets (and probably any TCP based protocol on top of akka). To show you this we’ll use the same setup as we did in the article on visualizing backpressure. ...

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Rx-netty and Karyon2 based cloud ready microservice


Netflix Karyon provides a clean framework for creating cloud-ready micro-services. In your organization if you use the Netflix OSS stack consisting of Eureka for service registration and discovery, Archaius for property management, then very likely you use Karyon to create your microservices. Karyon has been undergoing quite a lot of changes recently and my objective here is to document a ...

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Using separate Postgres Schemas for the same database in a Grails App


Recently, I wanted to use the same Postgres Database but split my persistence layer into separate components which used separate schemas. The motivation was to promote modular design, separate concerns and stop developers tripping up over each other. Vertical domain models can be difficult to achieve but not impossible. In my shopping application, I had a user component, a shopping ...

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Neo4j: The BBC Champions League graph


A couple of weekends ago I started scraping the BBC live text feed of the Bayern Munich/Barcelona match, initially starting out with just the fouls and building the foul graph. I’ve spent a bit more time on it since then and have managed to model several other events as well including attempts, goals, cards and free kicks. I started doing ...

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We’re Taking Bets: This Annotation Will Soon Show up in the JDK


This recent Stack Overflow question by Yahor has intrigued me: How to ensure at Java 8 compile time that a method signature “implements” a functional interface. It’s a very good question. Let’s assume the following nominal type: @FunctionalInterface interface LongHasher { int hash(long x); } The type imposes a crystal clear contract. Implementors must provide a single method named hash() ...

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Java EE Deployment Scenarios for Docker Containers


I’ve been posting some content around Docker since a while and I like to play around with containers in general. You can find some more information about how to run Docker-Machine on Windows and also showed you how to use the Docker 1.6 client. One of the first blog posts was a compilation of all kinds of resources around Java ...

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Is Getter DI A Good Idea?


Sometimes, you may hear about dependency injection done via a getter method, which subclasses override or mock frameworks fake for testing. It allows the class to have a set dependency that is actually hard coded, but can be “injected” if need be. I’ve written before about the idea of what I will call “firm-coded” dependencies from now on. I didn’t ...

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