This is not the first time I need to install and configure a MySql Community Server on a fresh system with Ubuntu (16.04) running on it. So instead next time to have to google for the individual steps again, I decided to write a post. Find out also how to tweak the Server configuration.

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This post describes how to develop a Java EE REST service, usually part of a REST API backend, that will provide information about the current version of the implementation plus the git sha-1 number1. This can be very useful in continuous delivery2 scenarios or for the operations team, where they make a smoke test after deployment to “humanly see” if the API is “alive”, plus one gets which version/commit is currently deployed. The post implies you are also using Maven3 to build your project

So when making a GET REST call against the service:

GET http://localhost:8080/some-root-context/version

I would expect something like the following

   "version": "1.2.0",
   "gitSha1": "8f0b7f7e1fc0d"

where the version attribute displays the version of the project from the pom.xml4 file and the gitSha1 attribute contains the first, let’s say 13 characters of the SHA-1 calculated from the git commit that corresponds to this deployment.

Generally, eight to ten characters are more than enough to be unique within a project, but I choose thirteen just to be sure :)

You can then use the gitSha1 value with the git show command to show the corresponding commit:

$ git show 8f0b7f7
commit 8f0b7f7e1fc0dcde3ccc0a9418f37a698dabb3b7
Merge: df736ab 3ebcbdb
Author: Adrian Matei <>
Date:   Sat Dec 3 09:30:41 2016 +0100

    Merge branch 'master' of

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In this post I will shortly present how to enable the provided RESTEasy CORS Filter in a REST API backend application. Well, it is officially documented, but for me was not that straightforward to use it and I want to share how I accomplished this. If you are new to CORS and want to learn more about it I suggest you read the document from Mozilla Developer Network - HTTP access control (CORS).

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In this post I will briefly describe the steps and issues encountered when migrating a Java EE REST API from JBoss EAP 6 to JBoss EAP 7 - this implies migrating from a Java EE 6/JAX RS 1.0 implementation to a Java EE 7/JAX RS.2.0 implementation. The trigger was the announcement from Red Hat regarding the general availability of their JBoss Enterprise Application Platform 7 (JBoss EAP) 1. JBoss EAP 7 is based on Wildfly 102, so the code snippets showed along the post should work on Wildfly 10 too.

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One of my main concern when I considered the migration from Wordpress to Jekyll was how would I be able to handle multiple authors, because this plays an important role in the website supporting our Coding Friend Program. Fear no more, I have found a satisfactory way to handle multiple authors with Jekyll1 and in this short post I list the main points concerning that.

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