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Are You Using SQL PIVOT Yet? You Should!

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Every once in a while, we run into these rare SQL issues where we’d like to do something that seems out of the ordinary. One of these things is pivoting rows to columns. A recent question on Stack Overflow by Valiante asked for precisely this. Going from this table:             +------+------------+----------------+-------------------+ | dnId | propNameId ...

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Default Methods: Java 8’s Unsung Heros

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A few weeks ago I wrote a blog saying that developers learn new languages because they’re cool. I still stand by this assertion because the thing about Java 8 is it’s really cool. Whilst the undoubted star of the show is the addition of Lambdas and the promotion of functions to first class variables, my current favourite is default methods. ...

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Validation in java (javafx)

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Validation is one thing that’s missing from the core javafx framework. To fill in this gap there is already a 3rd party validation library that’s present in controlsfx. However there’s one issue I have with it: it wasn’t created with FXML in mind. That’s not to say it isn’t a good library, it just misses this detail and for me ...

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INTEL Perceptual Computing – RealSense Challenge 2014

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            Perceptual Computing technology is redefining the boundaries between human and computer interaction. Intel invites you to claim your share of history by designing new, leading edge perceptual computing Apps. RealSense Challenge 2014 is a new contest in which developers are challenged to design perceptual computing apps. At the heart of this competition, the new ...

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What DSLs are not for

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Domain specific languages are special programming languages. Each fits some special “domain” and makes the business code simpler. Using a DSL the business level problem can be implemented higher level and therefore the resulting code is simpler, it is created faster, presumably contains less errors. Some DSLs in some areas make it even possible to develop business functionality by the ...

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Using IntelliJ bookmarks

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This is a quick post about IntelliJ’s nice bookmark feature. IntelliJ gives you the option to bookmark single lines of code. After a line has been bookmarked, you can use various ways to jump directly back to this line. So it can be a good idea to bookmarks code locations you often work with. To create a new bookmark you ...

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A beginner’s guide to JPA/Hibernate flush strategies

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Introduction In my previous post I introduced the entity state transitions Object-relational mapping paradigm. All managed entity state transitions are translated to associated database statements when the current Persistence Context gets flushed. Hibernate’s flush behavior is not always as obvious as one might think.       Write-behind Hibernate tries to defer the Persistence Context flushing up until the last ...

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Feature Toggles are one of the worst kinds of Technical Debt

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Feature flags or config flags aka feature toggles aka flippers are an important part of Devops practices like dark launching (releasing features immediately and incrementally), A/B testing, and branching in code or branching by abstraction (so that development teams can all work together directly on the code mainline instead of creating separate feature branches). Feature toggles can be simple Boolean ...

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Test Attribute #8 – Truthiness

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I want to thank Steven Colbert for coining a word I can use in my title. Without him, all this would still be possible, had I not given up looking for a better word after a few minutes. Tests are about trust. We expect them to be reliable. Reliable tests tell us everything is ok when they pass, and that ...

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Introducing Hadoop Development Tools

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Few days back Apache Hadoop Development Tools a.k.a. HDT was released.  The projects aims at bringing plugins in eclipse to simplify development on Hadoop platform. This blog aims to provide an overview of few great features of HDT. Single Endpoint The project can act as a single endpoint for your HDFS, Zookeeper and MR Cluster. You can connect to your HDFS/Zookeeper instance ...

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