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Java Singleton Design Pattern

Its one of the simplest design pattern in Java. If any one asks me which design pattern you are good then I would proudly say Singleton. But when they ask in depth concept of singleton ...
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How to find Prime Factors of Integer Numbers in Java – Factorization

One of the common homework/task in programming courses is about Prime Factorization. You are asked to write a program to find prime factors of given integer number. The prime factors ...
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OutOfMemoryError on overprovisioned heap

Why am I getting the OutOfMemoryError when allocating a data structure that should happily fit within the heap I have provided for the JVM? This was a question I recently faced. Indeed, ...
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Java 8 default methods can break your (users’) code

At first glance, default methods brought a great new feature to the Java Virtual Machine’s instruction set. Finally, library developers are able to evolve established APIs without ...
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JavaOne 2014 – Some First Analysis on Submissions

Time is running away these days. So many things happening in parallel and of course the most important Java conference is in the middle of everything. JavaOne 2014 closed the CfP doors ...
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Choosing a fast unique identifier (UUID) for Lucene

Most search applications using Apache Lucene assign a unique id, or primary key, to each indexed document. While Lucene itself does not require this (it could care less!), the application ...
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Too Fast, Too Megamorphic: what influences method call performance in Java?

Whats this all about then? Let’s start with a short story. A few weeks back I proposed a change on the a Java core libs mailing list to override some methods which are currently final. ...
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Okay, everybody who touches Java bytecode

The Oracle v. Google holds that copying the Structure, Sequence, and Organization of the Java APIs is a copyright violation. And a copyright violation is not just the act of copying, ...
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Debugging to understand Finalizers

This post is covering one of the Java built-in concepts called Finalizer. This concept is actually both well-hidden and well-known, depending whether you have bothered to take a look ...
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Java 8 Friday: Language Design is Subtle

At Data Geekery, we love Java. And as we’re really into jOOQ’s fluent API and query DSL, we’re absolutely thrilled about what Java 8 will bring to our ecosystem. Java 8 Friday Every ...
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