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Grails – RESTful Webservice using JAX-RS plugin

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I discussed about RESTful architecture consideration and how to build RESTful web services using Jersey JAX-RS [JSR 311]  in JAVA. Today I am going to discuss how to build the RESTful web services using Grails framework. GRAILs framework is the platform which provides end to end solution to build web application from scratch to advance intuitive RIA web application. Grails ...

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Rethink Career Path

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The baby boomer generation probably helped define the image of career path and trajectory for many Gen X and Millennials that followed.  It was incredibly common for the baby boomer to remain with one company for their entire career, possibly move up the proverbial corporate ladder, and retire with a pension. The typical baby boomer’s lifespan may have looked like ...

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Garbage Collection in Java (4)

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G1: Garbage First The G1 collector is the latest collector to be implemented in the hotspot JVM. Its been a supported collector ever since Java 7 Update 4. Its also been publicly stated by the Oracle GC Team that their hope for low pause GC is a fully realised G1. This post follows on from my previous garbage collection blog ...

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An Automated OSGi Test Runner

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Among my fellow team members I was known for notoriously forgetting to maintain the (JUnit) test suite. I just can’t get this extra step of manually adding a test to a suite into my fingers. Fortunately there are continuous integration servers that collect tests by a naming pattern. If one of the orphan tests I introduced fails, it stands out ...

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Multilayered Architecture (5) – The Presentation Layer

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Introduction The final piece of a MultiLayered Architecture, in term of development design and dependencies is the Presentation Layer. It has mainly the scope to create an Interface with the final User of the application. It can take the form of Desktop forms, Java Applet, Web application and any other possible solution provided by technologies. Interchangeability At this stage, if all ...

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Testing Java 8 in 3 Easy Steps

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tl;dr Use your CI Setup to test Java 8. The upcoming Java 8 release promises a bunch of new feature for Java developers, but there’s always a risk when upgrading that your code will break. We all remember that when Java 7 shipped it had a series of quite severe bugs. Of course we can all help with avoiding the ...

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How to use Reflection to Document your Data Model based on JPA Annotations

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So using JPA, Hiber­nate or EBeans is cool when you can just anno­tate your Java classes, but haven’t you always wished you could “gen­er­ate” doc­u­men­ta­tion of your data model from the code? Pulling infor­ma­tion of the the JPA / Hiber­nate  and other val­i­da­tion annotations? Assum­ing you have all those nice Anno­ta­tions in your beans:           @Entity @Table(name ...

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Messaging with RabbitMQ

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We previously published a brief tutorial showing how to set up a Spring RabbitMQ Template. Now, let’s take a step back for a broader view of what RabbitMQ is and how you might use it. This article introduces the relevant concepts, hopefully helps you to navigate around one or two common “gotchas,” and provides links to more in-depth resources. It ...

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The Dangers of Correlating Subtype Polymorphism with Generic Polymorphism

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Java 5 has introduced generic polymorphism to the Java ecosystem. This has been a great addition to the Java language, even if we’re all aware of the numerous caveats due to generic type erasure and the consequences thereof. Generic polymorphism (also known as parametric polymorphism) is usually maintained orthogonally to possibly pre-existing subtype polymorphism. A simple example for this is ...

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