Skip to main content

TCP Client using Eclipse Vert.x, Kotlin and Gradle build

As part of my hobby project to control RaspberryPi using Google Home Mini and/or Alexa, I wanted to write a very simple TCP client that keeps a connection open to one of my custom written server in cloud (I will write another blog post to cover the server side on a later date). The requirement of the client is to send a shared secret upon connecting and then keep waiting for message from server. Vert.x, Kotlin and Gradle allow rapid development of such project. The generated jar can be executed on Raspberry Pi. These steps outline the project setup and related source code to showcase a Vert.x and Kotlin project with Gradle.

Read more »


Eclipse Vert.x meets GraphQL

I recently added GraphQL support to Gentics Mesh and I thought it would be a good idea to boil down the essence of my implementation in example so that I could share it in a simpler form. The example I’m about to show will not cover all aspects that I have added to the Gentics Mesh API (e.g. paging, search and error handling) but it will give you a basic overview of the parts that I put together. GraphQL does not require a GraphDB even if the name might suggest it.

Read more »


Preview of a guide for Java developers

I could not attend the last Eclipse Vert.x community face-to-face meeting last fall, but one item that was discussed is the need for guides aimed at certain types of developers. One of my missions as part of joining the team was to work on this and I’m very happy to share it with you today!

Read more »


Time scheduling with Chime

Eclipse Vert.x executes periodic and delayed actions with periodic and one-shot timers. This is the base for time scheduling and reach feature extension must be rather interesting. Be notified at certain date / time, take into account holidays, repeat notifications until a given date, apply time zone, take into account daylight saving time etc. There are a lot of useful features time scheduler may introduce to the Vert.x stack.

Read more »


Scala is here

The rise of Scala as one of the most important languages on the JVM caught many (me included) by surprise. This hybrid of functional and imperative paradigms struck a chord with many developers. Thanks to Scala a lot of people who’d never have touched a language like Haskell got exposed to functional programming. This exposure was one of the driving forces to get streams and lambda into the JVM.

Read more »


An Introduction to the Vert.x Context Object

Under the hood, the vert.x Context class plays a critical part in maintaining the thread-safety guarantees of verticles. Most of the time, vert.x coders don’t need to make use of Context objects directly. However, sometimes you may need to. This article provides a brief introduction to the vert.x Context class, which covers why it’s important, and why and when you might wish to make use of the Context directly, based on the author’s experience of building a generic async library which can be used with vert.x.

Read more »


Building services and APIs with AMQP 1.0

Microservices and APIs are everywhere. Everyone talks about them, presentation slides are full of them … some people are actually even building them. Microservices and APIs are of course not completely new concepts and they are a bit over-hyped. But in general the ideas behind them are not bad. Unfortunately, many people seem to believe that the only way how to implement an API in microservice is to use HTTP and REST. That is of course not true. Microservices and APIs can be based on many different protocols and technologies. My favorite one is of course AMQP. Don’t take me wrong, HTTP and REST is not necessarily bad. But in some cases AMQP is simply better and creating AMQP based APIs does not need to be complicated.

Read more »