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ADF Task Flow: Managed bean scopes for page fragments

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 ...
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Google AppEngine: Task Queues API

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 ...
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Why Developers Never Use State Machines

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 ...
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JBox2D and JavaFX: Events and forces

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 ...
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Using Groovy scriptlets inside a *.docx document

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 ...
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Stupid Design Decisions (Part I)

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.” ...
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Custom JSF validator for required fields

JSF components implementing EditableValueHolder interface have two attributes ‘ required’ and ‘ requiredMessage’ ...
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Akka STM – Playing PingPong with STM Refs and Agents

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, ...
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REST CXF for Spring JPA2 backend

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 ...
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Dynamic Property Management in Spring

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 ...
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