The next open source JVM. Built with @EclipseOMR.
Joined March 2017
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🎉 We're pleased to announce the release of Eclipse OpenJ9 v0.60.0!
Want to get more out of your checkpoint images? Learn how OpenJ9 CRIU Support lets you customize and tune checkpoint images for your applications in this deep dive by @JAVAPROmagazin
javapro.io/2026/07/30/beyond…
Check out the full JAVAPRO deep dive on OpenJ9 GC policies 👇
javapro.io/2026/05/21/openj9…
We’re excited to announce the release of Eclipse OpenJ9 v0.59.0 🎉
Get it now at ibm.biz/GetSemeru and explore the latest improvements.
Curious about OpenJ9 GC policies♻️? We’ve included a quick overview below with a deep-dive article coming soon. Stay tuned!
We’re pleased to announce the availability of Eclipse OpenJ9 v0.58.0 which adds support for OpenJDK 26 🎉
A big thanks to IBM for building and distributing Semeru Runtimes Open Edition with this release. Downloads available here: ibm.biz/GetSemeru
ALT OpenJ9
Eclipse OpenJ9 retweeted
Great article featuring @OpenLibertyIO and an exploration of #Java virtual threads and Open Liberty’s thread pool comparing memory footprint, CPU utilization, throughput and more.
#JakartaEE #MicroProfile #OpenJ9
infoq.com/articles/java-virt…
As @mstoodle says, we're always keen to hear from our users and our community is really quite friendly :) . If you haven't arleady, join our slack instance at openj9.slack.com/join/shared…
My Eclipse @OpenJ9 and IBM Semeru Runtimes talk at JCON 2024, looking at adoption and things we're doing to improve! Thanks again to @jcon_conference for the opportunity to present in a movie theatre!!
Reminder that our community meeting is today at 10:30am ET if you want to drop by!
A great opportunity to learn more about the most recent Eclipse @OpenJ9 release and to directly meet and hear from the developers and technical leads behind this incredible project!
Eclipse @OpenJ9 recently announced the release of OpenJ9 v0.44.0 (April Quarterly refresh) OpenJ9 v0.45.0 (JDK22). Join us at the OpenJ9 community call on June 18, 10:30am EST as we discuss some of the new features that made it to the release. calendar.app.google/T3YKp8xT…
...and Eclipse @OpenJ9 of course :)
You can have a laugh at my own antics, including my amusing quest to get the demo right, starting at about 26:30 in that video. Oh, and you can learn a bit about @OpenLibertyIO, CRIU, InstantOn, IBM Semeru Runtimes, and (not enough yet?) ultra fast 21.8X faster Java startup !!!!!
Powered by the CRIUsupport in Eclipse @OpenJ9 !!
JCON2024 keynote with @MarkusKett on EclipseStore: simple, databaseless in-memory data processing. Up to 1000x faster queries, up to 99% cloud db cost savings. With @OpenLibertyIO InstantOn and Semeru Runtimes JDK, production ready EclipseStore cluster nodes start in milliseconds
All feedback welcome!! We love to hear back from our users on stuff that goes well and on stuff we can make better!
Eclipse OpenJ9 retweeted
Honored to be speaking today about Cloud-Native Java at the Open Source North conference in beautiful St. Paul. Pls join me in ASC Room C at 1PM.
#osn2024 @OpenLibertyIO @openj9 @SemeruRuntimes – at St Paul, MN
Eclipse OpenJ9 retweeted
Some references that might interest you or others using quarkus: blog.openj9.org/?s=Quarkus . Not sure what their support stance is, though.
Eclipse OpenJ9 retweeted
How We Developed the Eclipse OpenJ9 CRIU Support for Fast Java Startup dzone.com/articles/how-we-de… via @DZoneInc Check out this feature that make @OpenLibertyIO an ideal runtime for #CloudNative and #serverless applications.
Eclipse OpenJ9 retweeted
@jcon_conference All three workshop sections showcase how Semeru Runtimes and Eclipse @openj9 use significantly (half to two thirds) less memory than e.g. Eclipse Temurin with the same heap size settings.
I'd love to hear how the workshop works for you!
Eclipse OpenJ9 retweeted
3rd (last) part of the workshop: see how the Semeru Cloud Compiler offloads @OpenJ9 JIT CPU and memory overheads. easy to deploy and enabled a 67% increase in the number of responses processed in the first minute for a JavaEE7 application running with just 1 CPU core and 200MB!
Eclipse OpenJ9 retweeted
Workshop part 2: learn about @OpenLibertyIO and Semeru Runtime InstantOn by adding a single line to a Dockerfile to start a JavaEE ready server in 200-400ms with no Java language restrictions. Not using InstantOn? Your server workloads could be starting 10X-20X slower!
Eclipse OpenJ9 retweeted
In part 1, learn about @OpenJ9's shared classes cache. See why @OpenLibertyIO uses it by default to save roughly 40% startup time v. Eclipse Temurin. Then learn how you can also easily cut ~50% from Tomcat startup with shared cache: on any platform with no language restrictions.
A great way to learn about how to use all our completely open source JVM technologies: 1) Shared Classes Cache (Java start in 50% of time), 2) InstantOn (Java start 10X-20X faster on Linux), and our JIT server (Cloud Compiler) that offloads JIT overheads to a remote JIT service!
@jcon_conference @IBMDeveloper @OpenLibertyIO @openj9 JCON2024 workshop "Java with Ultra Fast Startup and Remote JIT Compilation", see README.md to run in a container on your laptop. Includes pdf of my slides so it's a bit beefy:
git clone github.com/mstoodle/jcon2024…
See openliberty.io/docs/latest/i… and eclipse.dev/openj9/docs/jits… for tips on how to reach ultra fast startup and offload JIT compilation overheads to an independent service!
