Category Archives: programming

Creating a Java WebStart (JNLP) application

Java WebStart, also called Java Network Launching Protocol (JNLP), allows you to launch Java applications directly from the internet using a webbrowser. In this article we will create a simple application and all configuration files necessary to launch it through … Continue reading

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Creating network diagrams with D3.js

D3.js is a JavaScript library for manipulating documents based on data. It can be used for all sorts of visualizations including network diagrams. In this article we will create a network diagram with nodes and directed links between them, visualized … Continue reading

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Welcome to Framework Limbo! Using Eclipse, Maven, GWT and Lombok

One of the main advantages of service engineering in Java is that there are quite a lot of environments, libraries, frameworks, IDEs and plugins to choose from. That’s also a major drawback. We ran into this while doing a recent … Continue reading

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How to use XMPP SASL EXTERNAL with Node.js

Almost a year ago I came across Node.js for the first time. Without going into details I must admit that a kind of like it. It has been useful to me in various projects. I especially like it for rapid … Continue reading

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Google Maps icons and circles revisited

Recently I needed to add icons and circles to a Google Map. My colleague Jan Sipke did a nice write up on this topic a couple of years ago. Unfortunatly things did change since then. Google released a new version of the Maps API … Continue reading

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Grep lines before and after matched line

The command grep is really useful for finding matches of a certain word in files or streams. However, until recently I didn’t know how to display lines before and after the matched line(s). Let’s say we have a file named … Continue reading

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Temperature graphs

In a previous article we looked at remote measurement of temperature and humidity. Now it is time to show the results of the temperature measurements. First a recap of the setup: Three remote temperature and humidity sensors are located in … Continue reading

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