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Three for the price of one

Few weeks ago in the middle of my summer vacation I had a sudden motivation spike when I was browsing my backlog/notepad (analog i.e. paper & pen) where I write down ideas or problems I'd like solve or try out at some point. Two items in the backlog caught my eye and those two produced a third idea in the form of this blog post.

Backlog items

On my backlog I had two separate items that caught my interest.

First item on backlog was a utility library for validating Finnish social security numbers (SSN, HeTu, henkilötunnus) and business identifications (y-tunnus). Both of these have predefined rules on how they are formed and I have implemented utilities for these same validations a few times in the past.
I have discussed about the need for these utilities many times and last time just before my summer vacation with my colleagues because these exact utilities don't exist in the public repositories or if they do we haven't found them and many of us had implemented these utilities several times.

Secondly I had a note that I should try to deploy a library to public Maven repository. This seemed like a idea that I really should and wanted to try out. I just didn't have a suitable library that I could apply to this but the first item provided a solution for that.

The identification validation library

I decided to implement the library with Java 8 for a few reasons. I work a lot with JVM languages so JVM seemed like a safe bet. Java is popular, people who work with any JVM language can use the same library. Despite of what JVM language one uses they can most likely understand Java and my code.

I'm not going to go through the simple code here but provide a link in the end of post where you can review the code yourself.

Publishing the library to public maven repository

I tried first a search with google and ended up having dozens of instructions on how to deploy to Sonatype OSS repository.

After a quick browse through the links I ended up following this blog post and Sonatype documentation and from there to Maven specific documentation

In the end my pom.xml ended up looking a bit different than on the selected blog post but with it I can just issue a maven command mvn clean deploy and my library will be deployed to Sonatype's OSS repository.

Things to notice

Browsing through the documentation and trying to get the library published brought up a few things to remember.
- Make sure you have Sonatype JIRA credentials
- Create a new project ticket
 - Use a domain that you own or come up with a alternative solution

Creating the JIRA credentials isn't a big deal one just has to register to the Sonatype JIRA and verify that you have the same credentials on you Maven settings.xml.

Creating the project ticket is easy as the page has a direct link for that.
If you don't own a domain you can do as I did, use a maven group id of your github account e.g. com.github.jorilytter. Now that I have write permissions to my group id I can publish my libraries under all subgroups of that.

The code and the library

The code is available via my github account at and the readme contains instructions on how to add the library as a dependency for your own project.

Final thoughts

Now that I have implemented the library and it's published to a public repository I hope that I can and remember to use it in future projects if needed and hopefully other developers find it and use it.

Now that I know how and have permissions to publish libraries to Sonatype's public Maven repository if I come up with ideas of other common libraries that could be useful I'll be publishing them.


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