What's new in the Eclipse OpenJ9 project

Eclipse OpenJ9 version 0.35.0 released

October 2022

We're pleased to announce the availability of Eclipse OpenJ9™ v0.35.0.

This release supports OpenJDK version 8, 11, and 17. For more information about supported platforms and OpenJDK versions, see Supported environments.

Apple silicon macOS® is now a fully supported, production-ready target for OpenJDK 11 and later.

Other updates in this release include the following:

• Java dump files contain more information about waiting threads
• New user2 event added for taking system dump files with exclusive access without overriding the user event
• New -XX:[+|-]PerfTool option added for enabling or disabling the JIT support for the perf tool without affecting the existing -Xjit options
• -XX:+EnsureHashed:java/lang/Class,java/lang/Thread is added to the list of default options in the options.default file for pre-hashing Class and Thread objects from the start and hence, improving performance
• New options, -XX:JITServerMetricsSSLKey and -XX:JITServerMetricsSSLCert, added for encrypting the custom metrics with SSL or TLS
• -XX:[+|-]JITServerLocalSyncCompiles is now enabled in most cases to reduce the latency of the compilations that are performed synchronously. It is disabled when you specify -Xjit:count=0 and in a few advanced use cases such as running the JVM in debug mode.

To read more about these and other changes, see the OpenJ9 user documentation.