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Streaming Files from MongoDB GridFS

Not too long ago I tweeted what I felt was a small triumph on my latest project, streaming files from MongoDB GridFS for downloads (rather than pulling the whole file into memory and ...
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Arquillian with NetBeans, GlassFish embedded, JPA and a MySQL Datasource

This is an, let’s call it accidental post. I was looking into transactional CDI observers and playing around with GlassFish embedded to run some integration tests against it. ...
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Morphia and MongoDB: Evolving Document Structures

In my previous post on Morphia, I went through some typical usages and mentioned some caveats and workarounds for known problems. I showed how easy it is to work with Morphia and how ...
java-interview-questions-answers

Master Detail CRUD operations with Regions ADF 11g

Hi, This is an example that demonstrates how to create a Master Detail relationship between tables by using Regions. The main purpose of regions is the notion of reusability. With regions ...
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Extending your JPA POJOs

Extensibility is an important characteristic in many architectures.  It is a measure of how easy (or difficult) it is to add or change functionality without impacting existing ...
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OpenShift Express: Deploy a Java EE application (with AS7 support)

During the past few years, I’ve been hearing about “cloud” services more and more. Initially I wasn’t really curious to try them out. But a few months (a year?) ...
java-interview-questions-answers

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

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, ...
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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 ...
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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 ...
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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 ...
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