Microsoft has acquired jClarity!

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Today we are delighted to announce that Microsoft has acquired jClarity (see Microsoft’s official statement).

It’s always been jClarity’s core mission to support the Java ecosystem. We started with our world-class performance tooling and then later became a leader in the AdoptOpenJDK project. Microsoft leads the world in backing developers and their communities, and after speaking to their engineering and programme leadership, it was a no brainer to enter formal discussions. With the passion and deep expertise of Microsoft’s people, we’ll be able to support the Java ecosystem better than ever before!

jClarity will be bringing its expertise in Java, OpenJDK and performance tuning and applying that to Java workloads on Azure for customers like Adobe, Daimler, and Société Générale. We’ll also be supporting other services such as Azure HDInsights and Microsoft affiliated organizations such as Minecraft[1].

The jClarity team will continue to work out in the open in various Java communities. With Microsoft’s support, we anticipate being able to contribute back in new and exciting ways.

We look forward to working with Microsoft Azure engineers to make Azure a better platform for Microsoft’s Java customers, developers and end-users.


To our customers – we will be contacting each of you in the coming weeks to guide you on product and support matters. We cannot express our gratitude enough for the trust you have placed in us over the past seven years, and we look forward to working with you at Microsoft.

To folks who were looking to explore Censum, Censum as a Service, Illuminate or our commercial AdoptOpenJDK support, please contact me at

To our supporters and Friends of jClarity community – you have been epic! We look forward to you continuing the journey with us in taming those Java workloads at Microsoft. Stay tuned for more news soon on how we’ll interact with you going forward. Don’t worry – we are not going away whatsoever!

To my co-founders, the jClarity team and the people behind them, start-ups are challenging. Through your arduous work, jClarity has been a successful company and also had a massive positive impact on the Java ecosystem. I could not be prouder of our team who never lost focus on doing the right thing by the community, supporting customers, and building out real technical innovation.

I am looking forward to carrying on with you all and achieving even more at Microsoft. For the curious, I will share some personal thoughts on my (very bare) Medium later on.



Martijn (formerly CEO @ jClarity)

Now proudly the Principal Engineering Group Manager (Java) @ Microsoft.

[1] We know how important this one is to kids and kids at heart! We’re humbled that we’ll get a chance to help on this icon of the gaming world.