Java Code Geeks

Consumerization of IT - What it means for the Architect

2012-05-30T13:00:00.000+03:00

Consumerization is described as the trend for IT to first emerge in the Consumer space and subsequently makes its way into the enterprise world. But what exactly in the consumer world, that is making...

ADF Task Flow: Managed bean scopes for page fragments

2012-05-30T10:00:00.000+03:00

Introduction When we work with ADF Task Flows and need to implement some flow specific business logic or store some information connected with the flow, we usually use ...

Google AppEngine: Task Queues API

2012-05-30T01:00:00.000+03:00

Task Queues com.google.appengine.api.taskqueue With Task Queues a user can initiate a request to have applications perform work outside of this request; they are a powerful tool for...

Why Developers Never Use State Machines

2012-05-29T22:00:00.000+03:00

A few months ago I saw a great little blog post about state machines on the Shopify blog. The message was that state machines are great and developers should use them more – given my recent...

JBox2D and JavaFX: Events and forces

2012-05-29T19:00:00.000+03:00

In yesterdays samples you saw how you can create a simple world, and display it with WorldView, and how to provide custom Renderers. Now we’re going to add some user input. We’ll create a control...

Using Groovy scriptlets inside a *.docx document

2012-05-29T16:00:00.001+03:00

Introduction One of my recent projects required automated generation of contracts for customers. Contract is a legal document of about 10 pages length. One contract form can be applied for many...

Stupid Design Decisions (Part I)

2012-05-29T13:00:00.000+03:00

Maybe you know the joke where a young software engineer goes into a bar, puts a green frog on top of the bar counter and the frog says: "Kiss me, I'm an enchanted princess." The bar keeper is...

Custom JSF validator for required fields

2012-05-29T10:00:00.000+03:00

JSF components implementing EditableValueHolder interface have two attributes ' required' and ' requiredMessage' - a flag indicating that the...

Akka STM - Playing PingPong with STM Refs and Agents

2012-05-29T01:00:00.000+03:00

PingPong is a classic example where 2 players (or threads) access a shared resource - PingPong Table and pass the Ball (state variable) between each other. With any shared resource, unless we...

REST CXF for Spring JPA2 backend

2012-05-28T22:00:00.000+03:00

In this demo, we will generate a REST/CXF application with spring/jpa2 backend. This demo presents the track REST-CXF of minuteproject. The model from ...

Dynamic Property Management in Spring

2012-05-28T19:00:00.000+03:00

Static and Dynamic Properties are very important for both operational management and changing the behavior of the system at the production level. Specially, dynamic parameters reduces interruption of...

Embedding Ops members in Dev teams

2012-05-28T16:00:00.000+03:00

For about 2 months I was sitting with a dev team while we worked through how to build a new service which will be continuously deployed. I wanted to share my experiences here because I’ve read both...

How to deal with {conservative, intractable, annoying} APIs

2012-05-28T13:00:00.000+03:00

Have you ever been fighting with an, at least for your current purpose, inflexible API? I picked up one of the trickier scenarios - calling super( ... ) with parameters. Sometimes there will be...

TeamCity artifacts: HTTP, Ant, Gradle and Maven

2012-05-28T10:00:00.000+03:00

In how many ways can you retrieve TeamCity artifacts? I say plenty to choose from! If you’re in a world of Java build tools then you can use plain HTTP request, Ant + Ivy, Gradle and Maven to...

Load or Save Image using Hibernate - MySQL

2012-05-28T01:00:00.000+03:00

This tutorial will walk you throughout how to save and load an image from database (MySQL) using Hibernate. Requirements For this sampel project, we are going to use: Eclipse IDE (you...

Why I will continue to use Spring and Java EE in new Enterprise Java Projects in 2012/2013

2012-05-27T15:00:00.000+03:00

Over one year passed since my technology decision making post and I am glad to see that I am still in perfect harmony with it. Some months ago I have written an answer to a nice blog of Kai Wähner...

OutOfMemoryError: Java heap space - Analysis and resolution approach

2012-05-26T15:00:00.000+03:00

java.lang.OutOfMemoryError: Java heap problem is one of the most complex problems you can face when supporting or developing complex Java EE applications. This short article will provide...

Spring & JSF integration: Pagination

2012-05-25T22:00:00.000+03:00

When working with large datasets you often need to present data in a paged format. Pagination is an interesting problem because it tends to cut across all layers of your application, from the view...

Spring Testing Support with TestNG

2012-05-25T19:00:00.000+03:00

TestNG is a test framework which is designed to cover all categories of tests: unit, functional, end-to-end, integration, (etc). It includes a lot of features such as flexible test configuration,...

JavaFX 2 GameTutorial Part 3

2012-05-25T16:52:00.001+03:00

Introduction This is part 3 of a six part series related to a JavaFX 2 Game Tutorial. If you’ve missed Part 1 and Part 2, I encourage you to go through them before beginning this tutorial. To...

Book review: 'Are you smart enough to work at Google?'

2012-05-25T16:00:00.001+03:00

You need to toss a coin for a football match. The only coin you have is bent and biased towards one outcome. How do you use the coin and ensure a fair toss? I love a good a puzzle and there are...

Implementing Master Slave / Grid Computing Pattern in Akka

2012-05-25T10:00:00.000+03:00

Master Slave pattern is a prime example of fault tolerance and parallel computation. The idea behind the pattern is to partition the work into identical sub tasks which are then delegated to Slaves....

Apache Shiro Part 3 - Cryptography

2012-05-25T01:00:00.000+03:00

Besides securing web pages and managing access rights Apache Shiro does also basic cryptography tasks. The framework is able to: encrypt and decrypt data, hash data, generate random...

Understanding how OSGI bundles get resolved

2012-05-24T22:00:00.000+03:00

I’d like to review how OSGI bundles get resolved and use Apache Karaf to demonstrate. Karaf is a full-featured OSGI container based on the Apache Felix kernel and is the corner stone for the Apache...

A crash course in Scala types

2012-05-24T19:00:00.000+03:00

After many years of Java development, discovering Scala’s type system and related features was something of a departure for me. Suffice to say GADT wasn’t my first four letter utterance when learning...