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JPA Tutorial – Setting Up JPA in a Java SE Environment

JPA stands for Java Persistence API, which basically is a specification that describes a way to persist data into a persistent storage, usually a database. We can think of it as ...
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URL shortener service in 42 lines of code in… Java (?!) Spring Boot + Redis

Apparently writing a URL shortener service is the new “Hello, world!” in the IoT/microservice/era world. It all started with A URL shortener service in 45 lines of Scala ...
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Clustered Idempotent Consumer Pattern with Infinispan

I’ve created a small project that shows how to use JBoss Infinispan with Apache Camel and the Idempotent Consumer Pattern to guarantee a message will not be processed twice in ...
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The dark side of Hibernate AUTO flush

Introduction Now that I described the the basics of JPA and Hibernate flush strategies, I can continue unraveling the surprising behavior of Hibernate’s AUTO flush mode. Not all queries ...
spring-interview-questions-answers

Validation groups in Spring MVC

Validation constraints in Bean Validation may be added to one or more groups via groups attribute. This allows you to restrict the set of constraints applied during validation. It ...
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Upgrading Spring 3.x and Hibernate 3.x to Spring Platform 1.0.1 (Spring + hibernate 4.x)

I recent volunteered to upgrade our newest project to the latest version of Spring Platform. What Spring Platform gives you is dependency & plugin management across the whole Spring ...
java-interview-questions-answers

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 ...
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