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Simulating CDI’s Session and Request Scope in a J2SE app

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We’re currently considering refactoring the Naked Objects framework to use JSR-330 (dependency injection) and EE-oriented big brother, JSR-299 (CDI). Using vanilla JSR-330 is a no-brainer, but there are also some nice features in JSR-299 that we’d like to exploit (such as events and decorators). The snag? The Naked Objects must also run transparently in J2SE environments. Now JSR-299 (at least, ...

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Using Groovy – A soft introduction

Groovy is an object-oriented programming language for the Java platform and can be used as a scripting language. Most of us but instead of using Groovy alone, we use Grails (web framework based on Groovy) for developing web applications. But Groovy can be used standalone for developing your internal tools. Let me explain why Groovy scripts have simplified our development ...

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Enabling JMX in Hibernate, EhCache, Quartz, DBCP and Spring

Continuing our journey with JMX (see: JMX for human beings) we will learn how to enable JMX support (typically statistics and monitoring capabilities) in some popular frameworks. Most of this information can be found on project’s home pages, but I decided to collect it with few the addition of some useful tips. Hibernate (with Spring support) Exposing Hibernate statistics with ...

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OSGi: An Introduction

OSGi, created for Java-based systems, provides a framework for modular systems. OSGi makes it possible to define the dependencies of each individual module with the others and enables users to control the lifecycle and dynamically change each component of the system. OSGi is a specification and the most common implementations can be counted as Equinox, Apache Felix and Knoplerfish. In ...

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DB unit testing with dbUnit, JSON, HSQLDB and JUnit Rules

In this week’s run of my TDD course, I thought it would be interesting to write a little fixture to make it easier to use dbUnit. My original thought was just to teach dbUnit about JSON, but it turns out that Lieven Doclo has done that already. So I decided to go a step further and also combine dbUnit with ...

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Pair Programming: The disadvantages of 100% pairing

I’ve written a lot of blog posts in the past about pair programming and the advantages that I’ve seen from using this technique but lately I find myself increasingly frustrated at the need to pair 100% of the time which happens on most teams I work on. From my experience it’s certainly useful as a coaching tool, as I’ve mentioned ...

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Debugging the JVM

In some (rare) cases you might find yourself in the situation that you managed to crash the JVM itself. I most recently managed this by setting the name of a ThreadGroup to null. In these cases it is useful to debug the JVM itself so that the crash can be located more precisely. Here are the steps to do it ...

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Best Of The Week – 2012 – W01

Hello guys, Time for the “Best Of The Week” links for the week that just passed. Here are some links that drew Java Code Geeks attention: * DevOps: What it is, and what it is not: In this article the author tries to demystify DevOps, discussing what it is and what is not. Also check out Devops has made Release ...

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