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EJB 3.x : Lifecycle and Concurrency models (part 1)

Java EE component life cycle and concurrency related details might not be new for seasoned professionals, but it is something which can take time to sink in for beginners.                As ...
java-interview-questions-answers

OSGi: the gateway into micro-services architecture

The terms “modularity” and “microservices architecture” pop up quite often these days in context of building scalable, reliable distributed systems. Java platform ...
java-interview-questions-answers

Java EE: Asynchronous constructs and capabilities

Introduction Java EE has a number of APIs and constructs to support Asynchronous execution. This is vital from a scalability and performance stand point. Let us assume 2 modules which ...
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HawtIO on JBoss EAP (Part II)

I just posted an entry on running HawtIO on JBoss Wildfly 8.1 recently. From that post you know how awesome HawtIO is, and all of the cool plugins it has to make managing your JVM based ...
java-interview-questions-answers

Writing Clean Tests – To Verify Or Not To Verify

When we write unit tests that use mock objects, we follow these steps:                    Configure the behavior of our mock objects. Invoke ...
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Maven Git Release

I need to start this post by stating that I’ve only started to work seriously with Git within the last year. Unfortunately, a lot of the projects that I work on are still using SVN ...
java-interview-questions-answers

Compile-time checking JPA queries

JPA provides several alternatives for querying data. Such alternatives may be classified attending to a variety of criteria, eg, language used (SQL vs JPQL) or whether queries are static ...
spring-interview-questions-answers

Spring MVC Integration Testing: Assert the given model attribute(s) have global errors

In order to report a global error in Spring MVC using Bean Validation we can create a custom class level constraint annotation. Global errors are not associated with any specific fields ...
java-interview-questions-answers

ADF: Popup, Dialog and Input Components

In this post I would like to focus on a very common use case when we have af:popup containing af:dialog with input components inside. There are a couple of pitfalls that we need to ...
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A beginner’s guide to JPA/Hibernate flush strategies

Introduction In my previous post I introduced the entity state transitions Object-relational mapping paradigm. All managed entity state transitions are translated to associated database ...
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