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A beginner’s guide to Java time zone handling

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Basic time notions Most web applications have to support different time-zones and properly handling time-zones is no way easy. To make matters worse, you have to make sure that timestamps are consistent across various programming languages (e.g. JavaScript on the front-end, Java in the middle-ware and MongoDB as the data repository). This post aims to explain the basic notions of ...

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Arquillian tests on a WildFly instance hosted on OpenShift

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Tech Tip #54 explained how to enable Arquillian for an existing Java EE project. In that tip, the tests were run against a locally installed WildFly server. Would the same adapter work if this WildFly instance was running on OpenShift ? No! Because the security constraints and requirement of a PaaS, as opposed to a xlocalhost, are different. Lets take a look at what’s required ...

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Between 0 and 1 – PWM with Raspberry Pi

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Switch on and off an LED and let run a motor at one speed and direction is easy, but what if I want to e.g. control the brightness of an LED or control motor-speed? A kind of analog signal is needed: This is done with Pulse-width modulation (PWM). PWM is a “modulation technique that conforms the width of the pulse, ...

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Don’t Block The UI

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I’ve talked with many end users about their badly written apps grievances and I’ve come to the conclusion that it isn’t a matter of native vs. cross platform or even HTML. Its a frustration issue, driven by unintuitive apps (hidden gestures etc.) and slow performance. The slow performance bit is the most misunderstood, there is a “feeling” of sluggishness that ...

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Using the “Do You Have Any Questions?” Question

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During most interviews, an interviewer provides the candidate the opportunity to ask questions. In most cases the highly-anticipated “Do you have any questions?” question falls towards the end of the session, though some companies today throw candidates a curveball and start the interview this way (consider yourself warned). Many candidates use this invitation to gather information that will be helpful in making a decision on any ...

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Do you really want to speed up your Maven compile/packaging? Then takari lifecycle plugin is the answer.

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Like many of you out there, I am working with a multi module Maven project. It is not a huge one comparing to many systems out there, it has 15 modules, with 3 different ear deployments, lots of parametrization with property files and around 100K lines of Java code. During peak development times, the code is heavily refactored, due it’s ...

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Agile Testing Days 2014–The #AgileTD Post

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Second time around is even better. And much more fun. You know people, who know you. You meet new people, who want to share and talk and ask. Oh and there’s beer, more beer. Thank you for all the people I met and re-met. You are awesome. You make ATD what it is. It is now summary time. Let’s recap, ...

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Spark: Parse CSV file and group by column value

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I’ve found myself working with large CSV files quite frequently and realising that my existing toolset didn’t let me explore them quickly I thought I’d spend a bit of time looking at Spark to see if it could help. I’m working with a crime data set released by the City of Chicago: it’s 1GB in size and contains details of ...

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