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java-interview-questions-answers

JPA Tutorial: Mapping Entities – Part 2

In my last post I showed a simple way of persisting an entity. I explained the default approach that JPA uses to determine the default table for an entity. Let’s assume that we want ...
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Trace output with Drools

Drools 6 includes a trace output that can help get an idea of what is going on in your system,  and how often things are getting executed, and with how much data. It can also help ...
java-interview-questions-answers

Jar Hell made Easy – Demystifying the classpath with jHades

Some of the hardest problems a Java Developer will ever have to face are classpath errors: ClassNotFoundException, NoClassDefFoundError, Jar Hell, Xerces Hell and company. In this post ...
java-interview-questions-answers

Java EE 7 with Angular JS – CRUD, REST, Validations – Part 2

This is the promised follow up to the Java EE 7 with Angular JS – Part 1. It took longer than I expect (to find the time to prepare the code and blog post), but it’s finally here! The ...
java-interview-questions-answers

Kafka Benchmark on Chronicle Queue

Overview I was recently asked to compare the performance of Kafka with Chronicle Queue.  No two products are exactly alike, and performing a fair comparison is not easy.  We can try ...
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How to connect to MongoDB from a Java EE stateless application

In this post I will present how to connect to MongoDB from a stateless Java EE application, to take advantage of the built-in pool of connections to the database offered by the MongoDB ...
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Akka Notes – Actor Logging and Testing

In the first two parts (one, two), we briefly talked about Actors and how messaging works. In this part, let’s look at fixing up Logging and Testing our TeacherActor. Recap This ...
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Neo4j: COLLECTing multiple values

One of my favourite functions in Neo4j’s cypher query language is COLLECT which allows us to group items into an array for later consumption. However, I’ve noticed that people sometimes ...
spring-interview-questions-answers

Spring WebApplicationInitializer and ApplicationContextInitializer confusion

These are two concepts that I mix up occasionally – a WebApplicationInitializer and an ApplicationContextInitializer, and wanted to describe each of them to clarify them for myself. I ...
java-interview-questions-answers

Exploring the SwitchYard 2.0.0.Alpha2 Quickstarts

In one of my last posts I explained how you get started with SwitchYard on WildFly 8.1. In the meantime the project was busy and released another Alpha2. A very good opportunity to ...
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