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1. JPA Mini Book

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3. JUnit Tutorial for Unit Testing

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Spring Data Solr Tutorial: Introduction to Solr

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Most of the applications must have a some kind of a search function. The problem is that search functions are often huge resource hogs and they can kill the performance of our application by causing heavy load to the database. That is why transferring that load to an external search server is a great idea. This is the first part ...

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Kanban is the New Scrum

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Maybe it’s all the time I spend with startups, but while I strongly value Scrum’s ideas behind self-organizing teams & continual feedback – I can’t help but feel Kanban represents the next level of agility, giving us more flexibility and capitalizing on the lessons we’ve learned from Lean. Scrum A lot of people tend to think Agile means Scrum – ...

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Hadoop setup on single node and multi node

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We will describe Hadoop setup on single node and multi node. The Hadoop  environment setup and configuration will be described in details. First you need to download the following software (rpm). Java JDK RPM Apache Hadoop 0.20.204.0 RPM A)  Single node system Hadoop setup 1) Install JDK on a Red Hat or CentOS 5+ system.   $ ./jdk-6u26-linux-x64-rpm.bin.sh Java is ...

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Minor Gotchas from migration to Java 7

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After several years of pushing, we are finally starting to pull our application out of the dark ages  in terms of software levels and one of those steps is upgrading our Java version to Java 7. For the most part, this has been fairly painless, but there have been a couple surprises: Test cases that had been running successfully for ...

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Multilayered Architecture (2) – The Domain Layer

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Introduction The domain layer is a collection of entity objects and related business logic that is designed to represent the enterprise business model. The major scope of this layer is to create a standardized and federated set of objects, that could be potentially reused within different projects. Once identified the enterprise business model segment that is useful for the project, ...

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Heroku and Java – From Newbie to Beginner, Part 1

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Recently I’ve heard that Heroku allows deployment of Java applications in it’s Cedar stack. Having no real software idea I decided I’ll give it a try and just configure SOMETHING to work on Heroku. I have some kind of crush on ReST (I still want to learn it and practice it) so I’ve decided my first application will be a ...

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Multilayered architecture (1) – Introduction

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Introduction If you ever worked in an IT project, you would probably know how necessary it is to factorize the source code to avoid that the entropy will take possession of your project as soon as it becomes larger and larger… If you ever encountered one of those scenarios: I started with a small project where everything was working fine but ...

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Are We Agile Yet?

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I read somewhere that a large number of software teams think they’re Agile because they do Daily Scrums. Now I don’t like to get religious, and I certainly don’t believe you have to follow some list of Ten Specific Practices to “Be Agile.” But I do think that sometimes companies get a little overly anxious to jump on the agile ...

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Asynchronous CDI Events

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Few days ago, during our regular code review, one of my colleagues raised a question what would happen — and if it’s even possible — when a CDI Observer (so a method with parameter annotated @Observes) would be invoked multiple times at the same time for different event instances. In other words, after producing few events, is it possible that ...

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