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Apache Apollo REST API

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Apache Apollo is a next-generation, high-performance, multi-protocol messaging broker built from the ground up to one day be a drop-in replacement of ActiveMQ 5.x. I have blogged about it in the past (Part I has already been published with part II on its way). Apollo’s non-blocking, asynchronous architecture allows it to be super fast and scale very well on multi-core ...

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Json deserialization with Jackson and Super type tokens

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Datatables is a jquery plugin to present tabular information – it can enhance a simple table or can use a AJAX based data and present the information in a tabular form. Datatables requires the data from the server to follow a specific JSON format for it to be displayed on screen. Consider the case where a list of Member entities ...

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TDD and the Transformation Priority Premise

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Last time, we looked at the Red/Green/Refactor phases of Test-Driven Development (TDD). This time we’ll take a detailed look at the transformations applied in the Green phase.                 The Transformation Priority Premise Most of you will have heard of the refactorings we apply in the last TDD phase, but there are corresponding standardized ...

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Java Deadlock Example – How to analyze deadlock situation

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Deadlock is a programming situation where two or more threads are blocked forever, this situation arises with at least two threads and two or more resources. Here I have written a simple program that will cause deadlock scenario and then we will see how to analyze it.               Java Deadlock Example package com.journaldev.threads; public ...

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Adding Turbochargers to JEE Apps

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One of the key roles, I play is evangelizing Akka within my local community. As part of the discussions, the question/doubt usually in people’s mind is how can Akka provide better scalability and concurrency against a well written Java/JEE application. Since the underlying hardware/JVM remains the same, how can the actor model ooze out more power than the traditional JEE ...

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Jenkins enhancements without plugins

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Jenkins is a popular open source continuous integration server. I use it heavily. Jenkins is super extensible CI server with huge plugins repository. But I must admit that there are a lot of cases when all these Jenkins plugin’s ‘zoo’ doesn’t help. What does it mean?: we need a tons of plugin to solve some non-trivial problem, too many plugins ...

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In-experienced development = Bowl full of Soup

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There are times when things become an uphill task all of a sudden. It happened to me in my last assignment. I was asked to take charge of an existing product. The product has been under development for about 2 years, and now it needed to fix a few things so that the system can scale well. It started quite ...

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GET / POST with RESTful Client API

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There are many stuff in the internet how to work with RESTful Client API. These are basics. But even though the subject seems to be trivial, there are hurdles, especially for beginners. In this post I will try to summarize my know-how, how I did this in real projects. I usually use Jersey (reference implementation for building RESTful services). See ...

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Java Thread: retained memory analysis

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This article will provide you with a tutorial allowing you to determine how much and where Java heap space is retained from your active application Java threads. A true case study from an Oracle Weblogic 10.0 production environment will be presented in order for you to better understand the analysis process. We will also attempt to demonstrate that excessive garbage ...

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Top 10 JavaCodeGeeks posts for 2012

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Following the tradition, we are once again compiling the top Java Code Geeks for the year that is ending. As with the Top 10 JavaCodeGeeks posts for 2010 and the Top 10 JavaCodeGeeks posts for 2011, we have created a compilation with the most popular posts for this year. The posts ranking was performed based on the absolute number of ...

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