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Concepts of Serialization

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With all this talk about why Optional isn’t serializable and what to do about it (coming up soon), let’s have a closer look at serialization. Overview This post presents some key concepts of serialization. It tries to do so succinctly without going into great detail, which includes keeping advice to a minimum. It has no narrative and is more akin ...

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2015 Starts Off Strong for Java 8

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JDK 8 is starting 2015 with a surge in popularity in terms of blog posts and articles. This is coinciding with Java being automatically upgraded to JDK 8 this month. In this post, I list and briefly describe some of the numerous articles and posts on JDK 8 that have been published already in 2015. JDK 8 Streams have been ...

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Getting Started with Gradle: Creating a Multi-Project Build

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Although we can create a working application by using only one module, sometimes it is wiser to divide our application into multiple smaller modules. Because this is a rather common use case, every self-respecting build tool must support it, and Gradle is no exception. If a Gradle project has more than one module, it is called a multi-project build. This ...

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How to create a pub/sub application with MongoDB ? Introduction

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In this article we will see how to create a pub/sub application (messaging, chat, notification), and this fully based on MongoDB (without any message broker like RabbitMQ, JMS, … ). So, what needs to be done to achieve such thing: an application “publish” a message. In our case, we simply save a document into MongoDB another application, or thread, subscribe ...

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New Javadoc Tags @apiNote, @implSpec and @implNote

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If you’re already using Java 8, you might have seen some new Javadoc tags: @apiNote, @implSpec and @implNote. What’s up with them? And what do you have to do if you want to use them? Overview This post will have a quick view at the tags’ origin and current status. It will then explain their meaning and detail how they ...

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Multiple Return Statements

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I once heard that in the past people strived for methods to have a single exit point. I understood this was an outdated approach and never considered it especially noteworthy. But lately I’ve come in contact with some developers who still adhere to that idea (the last time was here) and it got me thinking. So for the first time, ...

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Pushing the Limits – Howto use AeroGear Unified Push for Java EE and Node.js

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At the end of 2014 the AeroGear team announced the availability of the Red Hat JBoss Unified Push Server on xPaaS. Let’s take a closer look! Overview The Unified Push Server allows developers to send native push messages to Apple’s Push Notification Service (APNS) and Google’s Cloud Messaging (GCM). It features a built-in administration console that makes it easy for ...

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Don’t Remove Listeners – Use ListenerHandles

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Listening to an observable instance and reacting to its changes is fun. Doing what is necessary to interrupt or end this listening is way less fun. Let’s have a look at where the trouble comes from and what can be done about it. Overview The post will first describe the situation before discussing the common approach and what’s wrong with ...

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