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.Join OpenJ9 Slack
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.See OpenJ9 Issues
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
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
We're pleased to announce the availability of Eclipse OpenJ9 v0.41.0.
This release supports OpenJDK version 8, 11, and 17. For more information about supported platforms and OpenJDK versions, see Supported environments.
Other updates in this release include the following:
-XX:+CompactStringsoption is now enabled by default on Java 11 and later.
-Xshareclasses:readonlyoption and the JITServer AOT cache feature were enabled at the same time. With the change in behavior of the
-Xshareclasses:readonlyoption, the shared class cache startup creates a temporary new (writable) top layer that the JITServer AOT cache can use to store data that it needs to function.
-XX:[+|-]EnableDynamicAgentLoadingoption is added to enable or disable the dynamic loading of agents into a running VM.
-XX:[+|-]UseZlibNXoption is added to control the loading of the
zlibnxlibrary in the
LIBPATHenvironment variable on AIX® systems.
com.sun.management.ThreadMXBean.getThreadAllocatedBytes()API on all platforms except z/OS®. In the coming future z/OS release, the support for this API will be added on z/OS platforms as well.
To read more about these and other changes, see the OpenJ9 user documentation.
Performance highlights include: