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Writing a Hadoop MapReduce task in Java

Although Hadoop Framework itself is created with Java the MapReduce jobs can be written in many different languages. In this post I show how to create a MapReduce job in Java based ...
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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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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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Servlet Upload File and Download File Example

File Upload and Download and common tasks in a java web application. Since I have written a lot about java servlet recently, I thought to provide a sample example of file upload and ...
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Safely Create and Store Passwords

Nearly every time when it comes to user profiles it is necessary to manage user credentials and thus be able to create and store user passwords. It should be common practice to use ...
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