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JUnit in a Nutshell: Test Runners

The fourth chapter of my multi-part tutorial about JUnit testing essentials explains the purpose of the tool’s exchangable test runners architecture and introduces some of the available ...
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Java Concurrency Tutorial – Locking: Intrinsic locks

In previous posts we reviewed some of the main risks of sharing data between different threads (like atomicity and visibility) and how to design classes in order to be shared safely ...
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jUnit: Rules

Rules add special handling around tests, test cases or test suites. They can do additional validations common for all tests in the class, concurrently run multiple test instances, set ...
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EJB 3.x : Lifecycle and Concurrency models (part 2)

This is the second post of the two part series. The first part covered the life cycle and the concurrency behavior of Stateful and Stateless EJBs. I’ll cover Singleton EJBs in ...
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Why you should control Visibility of Class and Interface in Java

One of the important aspects of software development is maintenance, and  it’s proven by experience that a piece of software which keeps visibility of its components low is more ...
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OptaPlanner – Vehicle routing with real road distances

In the real world, vehicles in a Vehicle Routing Problem (VRP) have to follow the roads: they can’t travel in a straight line from customer to customer. Most VRP research papers and ...
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Really Dynamic Declarative Components

In this short post I am going to focus on ADF dynamic declarative components. I mean a well known ADF tag af:declarativeComponent. It can be used as a pretty convenient way to design ...
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2 Examples to Convert Byte[] array to String in Java

Converting a byte array to String seems easy but what is difficult is, doing it correctly. Many programmers make mistake of ignoring character encoding whenever bytes are converted ...
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Instant Big Data Stream Processing = Instant Storm

Every 6 months at Canonical, the company behind Ubuntu, I work on something technical to test our tools first hand and to show others new ideas. This time around I created an Instant ...
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JAXB – A Newcomer’s Perspective, Part 2

In Part 1 of this series, I discussed the basics of loading data from an XML file into a database using JAXB and JPA. (If JSON is called for instead of XML, then the same idea should ...
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