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Interesting Java Jersey + RxJava finding

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It so happens that in a few of the apps I work on here in Netflix we use Jersey libraries inside a Tomcat container. As such I use the JSR annotations a lot safe in the knowledge that Jersey will take care of all the plumbing work and deal with routing and serialization/deserialization so I […]

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Anti-pattern for testing RxJava code

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This is an obvious one but I find myself so often using it and every single time it means I have to spend extra time debugging my test / code until I realize that I’ve fallen for the same mistake again. I’m using RxJava here and using Groovy and Spock framework for testing — and […]

RxJava: Some Usage of Observable.zip

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Here’s  classic problem when dealing with a web app: you get a HTTP request to your app with a set of parameters. You need to hit a datastore to retrieve some record based on those parameters. You also need to create a (log?) entry somewhere about receiving this call — whether it’s for monitoring purposes […]

Using Optional in Java to check for null

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I see the need for null in Java still, but since the Optional class was introduced I think some of the usages of null can be eliminated by employing some of the capabilities of the Optional class. I will explain in this post a nice way you can implement checking for null in Java by […]

Common mistake when dealing with Reader in Java

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I’ve encountered this one a few times and came across again recently and thought it relevant to deserve its own post, so here it is. If you have done any I/O in Java you likely came across the Reader class, unlike the InputStream class(es) which deal with bytes, the Reader makes the transition into reading […]

Dependency overload … or laziness?

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This is something that started bugging me back in the maven area — when I switched from the likes of Ant as a build tool, which was relying on the user being explicit about a lot of things and doing a lot of the grunt work for it, to the maven world. Now maven was […]

Nicer implementations using Java streams

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I am not entirely sold on the performance of the Java streams but I will accept they are getting much better compared to the first cut, we now have parallel streams and all sorts, and also it provides a (nicer) functional approach to coding. I’m not going to go into the whole dispute of whether […]