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Logical vs physical clock optimistic locking

Introduction In my previous post I demonstrated why optimistic locking is the only viable solution for application-level transactions. Optimistic locking requires a version column that ...
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Six Tips for Interviewing Scrum Masters, Part 2

Now that you know what you expect from your Scrum Master’s job (the deliverables), and you know the essential and desirable skills (the first three tips), you can focus on creating ...
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Chained Access Delegation Pattern

Suppose a medium-scale enterprise that sells bottled water has a RESTful API (Water API) that can be used to update the amount of water consumed by a registered user. Any registered ...
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Trace output with Drools

Drools 6 includes a trace output that can help get an idea of what is going on in your system,  and how often things are getting executed, and with how much data. It can also help ...
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Java Code Geeks and ej-technologies are giving away FREE JProfiler Licenses (worth over $2000)!

Tired of having performance issues on your live servers? Then we have something especially for you! We are partnering with ej-technologies, creator of cool Java tools, and we are running ...
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Don’t Miss out on Writing Java 8 SQL One-Liners with jOOλ or jOOQ

More and more people are catching up with the latest update to our platform by adopting functional programming also for their businesses. At Data Geekery, we’re using Java 8 for our ...
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Six Tips for Interviewing Scrum Masters, Part 1

People want to know the “secret sauce” for hiring Scrum Masters and agile coaches. I wish it was easy to provide a standard set of questions. Because your agile team is unique, ...
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Jar Hell made Easy – Demystifying the classpath with jHades

Some of the hardest problems a Java Developer will ever have to face are classpath errors: ClassNotFoundException, NoClassDefFoundError, Jar Hell, Xerces Hell and company. In this post ...
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Java EE 7 with Angular JS – CRUD, REST, Validations – Part 2

This is the promised follow up to the Java EE 7 with Angular JS – Part 1. It took longer than I expect (to find the time to prepare the code and blog post), but it’s finally here! The ...
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Kafka Benchmark on Chronicle Queue

Overview I was recently asked to compare the performance of Kafka with Chronicle Queue.  No two products are exactly alike, and performing a fair comparison is not easy.  We can try ...
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