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java-interview-questions-answers

Java EE7 and Maven project for newbies – part 3 – defining the ejb services and jpa entities modules

Resuming from the previous parts Part #1 Part #2 We are resuming for the third part, we already have a parent pom and we have already defined the pom for our war module. In our original ...
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JavaFX 8u20 Days of Future Past (Always On Top)

It’s been a long time since I’ve posted topics relating to JavaFX. So, if you are still following along, awesome! Introduction In this blog post I want to blog about a very cool ...
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How to find Prime Factors of Integer Numbers in Java – Factorization

One of the common homework/task in programming courses is about Prime Factorization. You are asked to write a program to find prime factors of given integer number. The prime factors ...
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OutOfMemoryError on overprovisioned heap

Why am I getting the OutOfMemoryError when allocating a data structure that should happily fit within the heap I have provided for the JVM? This was a question I recently faced. Indeed, ...
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Java 8 default methods can break your (users’) code

At first glance, default methods brought a great new feature to the Java Virtual Machine’s instruction set. Finally, library developers are able to evolve established APIs without ...
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JavaOne 2014 – Some First Analysis on Submissions

Time is running away these days. So many things happening in parallel and of course the most important Java conference is in the middle of everything. JavaOne 2014 closed the CfP doors ...
spring-interview-questions-answers

Spring Integration 4.0: A complete XML-free example

1. Introduction Spring Integration 4.0 is finally here, and this release comes with very nice features. The one covered in this article is the possibility to configure an integration ...
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HOW-TO: Quartz Scheduler with Clustering in JEE application with MySQL

Quartz Scheduler is one of the most popular scheduling library in Java world. I had worked with Quartz mostly in Spring applications in the past. Recently, I have been investigating ...
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Choosing a fast unique identifier (UUID) for Lucene

Most search applications using Apache Lucene assign a unique id, or primary key, to each indexed document. While Lucene itself does not require this (it could care less!), the application ...
java-interview-questions-answers

Jax-RS custom exception handling

One of the nice things about working with JEE is the components available really are pretty standard.  While using JAX-RS, sometimes you need to control how exceptions get processed ...
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