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Creating a price model using k-Nearest Neighbours + Genetic Algorithm

Chapter 8 of Programming Collective Intelligence (PCI) explains the usage and implementation of the k-Nearest Neighbours algorithm. (k-NN). Simply put: k-NN is a classification algorithm ...
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Creating Code Coverage Reports for Unit And Integration Tests with The JaCoCo Maven Plugin

When I started using Java 7, I noticed right away that the Cobertura Maven plugin doesn’t support it. This was a huge problem to me because I used code coverage reports every day. ...
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From inside the code: Camel Routing Engine Part I

So I’ve recently re-kindled my interest in how Apache Camel works. Camel is such a powerful integration tool and is very widely used, but anytime I put it to work, I can’t help ...
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Optional in Java 8 cheat sheet

java.util.Optional<T> in Java 8 is a poor cousin of scala.Option[T] and Data.Maybe in Haskell. But this doesn’t mean it’s not useful. If this concept is new to you, imagine ...
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50 Servlet Interview Questions and Answers

Servlets are very important topic of Java EE and all of the web applications framework such as Spring and Struts are built on top of it. This makes servlet a hot topic in Java interviews. Here ...
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10 More Common Mistakes Java Developers Make when Writing SQL

I was positively surprised to see how popular my recent listing about 10 Common Mistakes Java Developers Make when Writing SQL was, both on my own blog and on my syndication partner ...
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Simple and lightweight pool implementation

Object pools are containers which contain a specified amount of objects. When an object is taken from the pool, it is not available in the pool until it is put back. Objects in the ...
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Async Servlet Feature of Servlet 3

Before we jump into understanding what Async Servlet is, let’s try to understand why do we need it. Let’s say we have a Servlet that takes a lot of time to process, something like ...
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5 Things You Didn’t Know About Synchronization in Java and Scala

Practically all server applications require some sort of synchronization between multiple threads. Most of the synchronization work is done for us at the framework level, such as by ...
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KISS My YAGNI

We are all familiar with the KISS (Keep It Simple, Stupid) and YAGNI (You Ain’t Gonna Need It) principles. And yet, overly complicated software is everywhere. Let’s use an application ...
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