About Joonas Javanainen

Joonas is a passionate software developer from Finland. He has worked on a multitude of problem domains, and focuses professionally on functional programming and JVM-based technologies.

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Increased compile-time safety with phantom types

Introduction Using phantom types is a very simple technique that can be used to increase the compile-time safety of code. There are a lot of potential use cases with different levels ...
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Advanced ZK: Asynchronous UI updates and background processing – part 2

Introduction In part 1 I showed how server push and threads can be used to execute background tasks in a ZK application. However, the simple example had a major flaw that makes it a ...
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Advanced ZK: Asynchronous UI updates and background processing – part 1

Asynchronous UI updates are very useful, because they typically improve the responsiveness, usability and the general feel of user interfaces. I’ll be focusing here on the ZK framework, ...
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Spring vs Guice: The one critical difference that matters

Spring objects are recognized based on their namesIt doesn’t matter whether you use XML or Java config, a Spring scope is roughly like a Map<String, Object> structure. ...
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Java pitfalls: Field access in inner classes

This is not a “pitfall” per se, but an implementation detail worth knowing. Let’s say I have a inner class with a field. Such a field is visible to the enclosing class, but which ...
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ZK Web Framework Thoughts

I’ve been asked several times to present some of my opinions about ZK. So, based of my experience of 4 years as a ZK user, here’s some thoughts: Overall developer experience, the ...
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