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What's new in version 0.51.0

The following new features and notable changes since version 0.49.0 are included in this release:

Features and changes

Binaries and supported environments

Eclipse OpenJ9™ release 0.51.0 supports OpenJDK 8, 11, 17, and 21.

Ubuntu 20.04 is removed from the list of supported platforms.

To learn more about support for OpenJ9 releases, including OpenJDK levels and platform support, see Supported environments.

New parameter maxstringlength added to the -Xtrace option

You can use the maxstringlength parameter of the -Xtrace option to specify the length of the string arguments and return values of a method that are now printed in a trace output in addition to the addresses.

For more information, see maxstringlength.

XL C++ Runtime 16.1.0.10 or later required for AIX OpenJ9 builds

AIX OpenJ9 builds now require version 16.1.0.10 or later of the IBM XL C++ Runtime.

Start of content that applies to Java 11 (LTS) and later Support for JDK Flight Recorder (JFR) in the VM for OpenJDK 11 and later running on all platforms

This release now supports JFR in the VM as a technical preview for OpenJDK 11 and later running on all platforms. In the 0.49.0 release, the support for JFR was available on OpenJDK 11 and later running on Linux® x86 and Linux on AArch64 only.

For more information, see -XX:[+|-]FlightRecorder. End of content that applies only to Java 11 and later

OpenJDK system properties used to initialize default encodings and locales

A number of OpenJDK system properties that were not set before are now set. For example, on Windows™ the console encoding properties reflect the console charset. The default locale might be different from previous Semeru versions, and is now consistent with OpenJDK behavior. In particular, on macOS® the default locale reflects the control panel settings rather than the environment variable settings. The locale script is set when available.

Known problems and full release information

To see known problems and a complete list of changes between Eclipse OpenJ9 v0.49.0 and v0.51.0 releases, see the Release notes.