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Unleash the power of Java

Optimized to run Java™ applications cost-effectively in the cloud, Eclipse OpenJ9 is a fast and efficient JVM that delivers power and performance when you need it most.

Grab a pre-built binary of OpenJDK with OpenJ9 from the AdoptOpenJDK community.

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Optimized for the Cloud

for microservices and monoliths too!

42% Faster Startup

over HotSpot

28% Faster Ramp-up

when deployed to cloud vs HotSpot

66% Smaller

when compared to HotSpot

Read performance details

Join the conversation

Join us on Slack where you can ask questions and chat directly with our developers. Whether you simply have a question about using OpenJ9, an idea for improvement, or a problem you want to discuss, we'd love to hear from you.

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Like all great open source projects, we have a vibrant and busy GitHub repository where you can create issues to explore ideas, request new features, or report any difficulties you are having.

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Participate in the
Eclipse OpenJ9 project

Become a contributor

We welcome contributions to the project in all shapes and forms. If you are interested in JVM development, we'd love to hear your ideas and help you collaborate with us on the code base. There are other ways you can contribute too, such as working on our website and docs. Be a part of the project and share in our success!

Contributor Guide

Join community calls

Our regular calls are a great place to find out what is going on in the project. As well as discussing our release plans and development status, we often feature lightning talks by members of the community. For example, technical deep dives or overviews about new features. To see agendas and recordings, look in the Slack #planning channel.

Add to Calendar
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OpenJ9 is an Eclipse Incubator Project
OpenJ9 is an Eclipse Incubator Project
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