The Practical Developer

Spring Boot and Kafka – Practical Configuration Examples

by Moisés Macero on November 24, 2018

This blog post shows how to configure Spring Kafka and Spring Boot to send messages using JSON and receive them in multiple formats: JSON, plain Strings or byte arrays. Based on this configuration, you could also switch your Kafka producer from sending JSON to other serialization methods.

This sample application also demonstrates the usage of three Kafka consumers within the same consumer group, so the messages are load-balanced between the three. Each consumer implements a different deserialization approach.

Besides, at the end of this post, you will find some practical exercises in case you want to grasp some Kafka concepts like the Consumer Group and Topic partitions.

How to deploy a Spring Boot WAR to Wildfly, JBoss or Tomcat

by Moisés Macero on August 6, 2018

This is a short guide on how to deploy a Spring boot war packaged application to Wildfly and Tomcat. As you know, Wildfly is the name of the community version of JBoss EAP, so this configuration should work for JBoss EAP as well.

Java and JSON – Jackson Serialization with ObjectMapper

by Moisés Macero on July 31, 2018

This guide contains examples that show you how to serialize and deserialize from Java to JSON. It covers the basics and the most common use cases: Strings, Objects, Dates, Optionals, Lists, Maps, etc.

Write BDD Unit Tests with BDDMockito and AssertJ

by Moisés Macero on May 10, 2018

In this post, I’ll show you how to write more readable Unit Tests using a Behavior-Driven Development style (BDD). This is a coding style that is very easy to adopt and, at the same time, brings a huge benefit: it increases your test readability (a lot). Besides, it’s a small change that may drive you to go full-BDD (i.e. writing your test scenarios before your code).

With a practical example, you’ll see how to make this change with two very popular libraries: Mockito (and its BDDMockito implementation) and AssertJ.

The Six Pitfalls of Moving to Microservices

by Moisés Macero on April 18, 2018

Microservices are not always the solution

We, as developers, make mistakes. For example, one of the most common ones is thinking that a new technical solution or paradigm will solve all the problems existing in a given Software Project. That won’t happen, but we’ll be tempted anyway to fall into this trap. Microservices Architecture is one of the most popular traps.