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Groovy’s Smooth Operators

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Take a trip back to 1984.  Apple release the Macintosh, ‘The Final Battle‘ is about to commence in V and Scotland win the Five Nations completing a grand slam in the process.  Right in the middle of miners’ strike in the UK, English pop group Sade release the catchy number: Smooth Operator.  It was chart success in the UK and in ...

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YouTube GData API and Android

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If you want to use the YouTube API v2 to search for content on YouTube with an Android device, the recommended way is the use the gdata-http-client java package. However, this requires that you parse the XML returned yourself, and navigate it. The reason is that out of the box the YouTube API v2 java library doesn’t work on Android. ...

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NoSQL is not just about BigData

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There is so much debate on the SQL vs NoSQL subject, and probably this is our natural way of understanding and learning what’s the best way of storing data. After publishing the small experiment on MongoDB aggregating framework, I was challenged by the JOOQ team to match my results against Oracle. Matching MongoDB and Oracle is simply honoring Mongo, as ...

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Hibernate 4.3 ORM Tool

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Hibernate has recently released the final version of Hibernate ORM 4.3, a Java-based ORM framework that also supports stored procedures and entity graphs. ORM Tool Hibernate 4.3 Released, Implementing JPA 2.1 Specification introduces the main features of the release, which are in short: Support for working with stored procedure and function calls, across both providers and database vendors. UPDATE and ...

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How to write one of the fastest expression evaluators in Java

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Granted, the title is a bit of an attention grabber, but nevertheless true (You course you never trust a benchmark you didn’t fake yourself – but that’s another story). So last week I was looking for a small and usable library to evaluate mathematical expressions. I almost directly stumbled upon this stackoverflow post. The recommended library (Expr) is really quite ...

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The signature of reduce() in Ceylon

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The Iterable interface defines a method named fold() with this signature:                         Result fold<Result>(Result initial, Result accumulating(Result partial, Element elem)) Where Element is the element type of the Iterable. This method accepts an initial value, and an accumulator function which is applied to each element of the iterable object ...

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AmazonSQS and Spring for messaging queue

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The next post will demonstrate how to use Spring JMS templates and DLMC’S together with AmazonSQS API in order to place message queue. Why would I use Amazon SQS? Easy to configure Cross-platfom support Earn from your self redundant, conjunction and scaling worries.         Why I wouldn’t use Amazon SQS? If the latency requirement demands less than  ~20 ...

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Big Data the ‘reactive’ way

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A metatrend going on in the IT industry is a shift from query-based, batch oriented systems to (soft) realtime updated systems. While this is associated with financial trading only, there are many other examples such as “Just-In-Time”-logistic systems, flight companies doing realtime pricing of passenger seats based on demand and load, C2C auction system like EBay, real time traffic control ...

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Automatically converting password hashes in Grails spring-security-core

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I was looking at this Stack Overflow question about converting password hashes and realized that it’s possible and rather convenient when using the spring-security-core plugin to automate the process. To start, we’ll need a PasswordEncoder that can work with both algorithms. Here I’m assuming that you’ll be converting from SHA-256 (optionally with a salt) to bcrypt, but the general approach ...

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