One Billion Downloads: Reflecting on the Journey of Eclipse Adoptium
One billion downloads.
It’s a number that’s difficult to comprehend, and one that certainly wasn’t on anyone’s mind when this journey began.
When we started what would eventually become AdoptOpenJDK, and later Eclipse Adoptium, we weren’t trying to build the world’s most widely used OpenJDK distribution. We were trying to solve a problem.
At the time, obtaining high-quality, production-ready OpenJDK binaries wasn’t as straightforward as it should have been. The Java ecosystem needed freely available, vendor-neutral builds that organisations and developers could rely on. More importantly, it needed an open community where the development, infrastructure, and decision making were transparent and collaborative.
What started as a handful of volunteers quickly became something much bigger.
The Early Days
Those early years were equal parts exciting and challenging.
There was no large engineering organisation behind the project. No dedicated marketing team. No guarantee that anyone would use what we were building.
Instead, there were passionate engineers contributing in their spare time, building release infrastructure, automating testing, solving difficult technical problems, and working together across company boundaries because they believed the ecosystem would benefit.
Every milestone felt significant.
The first successful builds.
The first major organisations adopting the binaries.
The first large-scale production deployments.
Every step reinforced the belief that an open community could build something trusted by developers around the world.
Growing Beyond a Community Project
As adoption accelerated, it became clear that the project had grown beyond its original ambitions.
Moving to the Eclipse Foundation and becoming Eclipse Adoptium was a significant moment. It provided a long-term home with open governance and encouraged even broader collaboration across the Java ecosystem.
Today, Adoptium is supported by an incredible community of contributors and organisations. Its binaries power everything from personal projects and university coursework to cloud platforms and enterprise applications running at global scale.
That growth didn’t happen overnight.
It happened because thousands of people contributed code, reviewed pull requests, reported bugs, improved documentation, operated infrastructure, sponsored development, and helped build trust over many years.
One Billion Downloads Represents More Than a Number
The billion-download milestone is exciting, but it isn’t really about downloads.
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It represents developers choosing open source.
It represents organisations placing their trust in a community-led project.
It represents years of engineering effort invested by hundreds of contributors across many companies and time zones.
Most importantly, it demonstrates what can be achieved when competitors collaborate to improve an ecosystem that benefits everyone.
Open source is often described as software, but its real strength has always been its people.
A Personal Reflection
I’ve been fortunate enough to be part of this journey from the early AdoptOpenJDK days, helping shape the project as it evolved into Eclipse Adoptium, and later serving as Chairman of the Eclipse Adoptium Working Group.
Looking back, I’m immensely proud of what the community has achieved together.
Not because of the number itself, but because of everything that number represents.
It reflects countless hours of engineering, collaboration, debate, problem solving, and shared purpose.
It reflects a community that continued to grow while remaining true to its principles of openness, transparency, and technical excellence.
Looking to the Future
Reaching one billion downloads is an incredible milestone, but it’s also a reminder that projects like Adoptium don’t run themselves.
Behind every release is a significant amount of infrastructure, testing, security work, and countless hours from contributors around the world. As adoption continues to grow, so do the costs of keeping the project reliable, secure, and available for everyone.
If your organisation depends on Eclipse Adoptium, or if Adoptium has helped power your own projects over the years, I’d encourage you to consider giving something back. Whether that’s contributing code, helping with documentation, participating in the community, or supporting the project financially through the Eclipse Foundation, every contribution helps ensure Adoptium remains a sustainable, vendor-neutral OpenJDK distribution for years to come.
Open source succeeds because people invest in it. One billion downloads is an incredible achievement. Let’s make sure we’re building a community that can support the next billion as well.
Thank You
A milestone like this belongs to everyone who has played a part.
Thank you to every contributor who submitted a pull request.
Thank you to every maintainer who reviewed code and helped others.
Thank you to every organisation that invested time, people, and resources into the project.
Thank you to the Eclipse Foundation for providing a home where the project could continue to thrive.
And thank you to the millions of developers and organisations who chose Adoptium and trusted it to run their applications.
One billion downloads is an incredible achievement.
I’m excited to see where the next chapter takes us.
