Do you want to know how to develop your skillset to become a Java Rockstar?

Subscribe to our newsletter to start Rocking right now!

To get you started we give you our best selling eBooks for FREE!


1. JPA Mini Book

2. JVM Troubleshooting Guide

3. JUnit Tutorial for Unit Testing

4. Java Annotations Tutorial

5. Java Interview Questions


and many more ....



NetBeans Java EE Tip #9: Create JSF Application from Database


Do you need to create an database front-end very quickly?  The NetBeans IDE allows one to develop a JSF application front end for a set of database tables very quickly, and with very little coding.  Now this tutorial is an oldie, but a goodie…and it is worth mentioning again for those who are not aware of it. First, create your ...

Read More »

Getting Started with Heron on Apache Mesos and Apache Kafka


Heron has been Open Sourced, woo! Heron is Twitter’s  distributed stream computation system for running Apache Storm compatible topologies in production. A Heron topology is a directed acyclic graph used to process streams of data. Heron topologies consist of three basic components: spouts and bolts, which are connected via streams of tuples. Below is a visual illustration of a simple topology: Spouts are ...

Read More »

Scala Notes – Futures – 1


Almost all modern programming languages have a Future-Promise idiom for concurrent programming. I don’t intend to bore you with why we need higher level of concurrency abstractions. Instead, in this post, we’ll cut to the chase and discuss only about Scala’s approach to Futures. A scala.concurrent.Future is a representation of a value that is yet to be realized. This value ...

Read More »

The Building Blocks of Your First Bot


The world of bots who can intelligently converse continues to build momentum. We’ve seen the opening up of the Facebook Messenger and LINE platforms, as well as improvements to the existing Telegram platform. In addition to new and improved platforms, the Kik bot store has opened, and Slack is making submission to their app store a product priority. While messaging ...

Read More »

Why Microservices Should Be Event Driven: Autonomy vs Authority


I’ve been working on a series of articles showing how to build microservices using an event-driven approach (which IMHO is the only real way to build microservices :) or… any complex distributed architecture). I’ll explore DDD, CQRS, Event-sourcing, event streaming, complex-event processing and more. I’m using a reference monolith application based on Java EE that uses all the typical Java ...

Read More »

Aspect Oriented Programming with Spring Boot


On a previous post I provided a simple example on how to achieve aspect orientation in spring by using a ProxyFactoryBean and implementing the MethodBeforeAdvice interface. On this example we will learn how to achieve aspect orientation by using Spring boot and Aspect4j annotations. Let’s start with our gradle file. group 'com.gkatzioura' version '1.0-SNAPSHOT' apply plugin: 'java' apply plugin: 'idea' ...

Read More »

Couchbase XDCR using Docker Swarm, Machine and Compose


Cross Datacenter Replication (XDCR) in Couchbase provides an easy way to replicate data from one cluster to another. The clusters are typically set in geographically diverse data centers. This enables for disaster recovery or to bring data closer to users for faster data access. This blog will show: Setup two data centers using Docker Swarm Run Couchbase containers on each node of Docker Swarm ...

Read More »

Cloud Foundry Java Client – Streaming events


Cloud Foundry Java Client provides Java based bindings for interacting with a running Cloud Foundry instance. One of the neat things about this project is that it has embraced the Reactive Stream based API’s for its method signatures, specifically using the Reactor implementation, this is especially useful when consuming streaming data. In this post I want to demonstrate a specific use case where ...

Read More »

Want to take your Java skills to the next level?

Grab our programming books for FREE!

Here are some of the eBooks you will get:

  • Spring Interview QnA
  • Multithreading & Concurrency QnA
  • JPA Minibook
  • JVM Troubleshooting Guide
  • Advanced Java
  • Java Interview QnA
  • Java Design Patterns