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PojavLauncherTeam
GitHub Repository: PojavLauncherTeam/openj9
 Path: blob/master/doc/release-notes/0.19/0.19.md
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Eclipse OpenJ9 version 0.19.0 release notes

These release notes support the Eclipse OpenJ9 0.19.0 release plan.

Binaries and supported environments

OpenJ9 release 0.19.0 supports OpenJDK 14.

Binaries are available at the AdoptOpenJDK project:

All builds are tested against the OpenJ9 functional verification (FV) test suite, the OpenJDK test suites, and additional tests at AdoptOpenJDK.

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

Notable changes in this release

The following table covers notable changes in v0.19.0. Further information about these changes can be found in the user documentation.

Issue number Description Version / Platform Impact
#8467 Change in behavior of StringBuffer and StringBuilder OpenJDK8 only StringBuffer and StringBuilder grow differently when sized at 1 G char[] or larger. They immediately grow to the maximum possible size, which is the behavior in Java 11 and later releases. To revert to the older behavior of growing only as much as necessary, use the -Djava.lang.stringBuffer.growAggressively=false option.
#8328 Option to print code cache usage to stderr at JVM shutdown All versions A new command line option -XX:+PrintCodeCache allows you to print the code cache memory usage to stderr at JVM shutdown.

Known Issues

The v0.19.0 release contains the following known issues and limitations:

Issue number Description Platform Impact Workaround
#479 Non-compressed references VM builds not available AIX Non-compressed references VM builds, which support heaps larger than 57GB, are built on Linux, Windows, and macOS. Manual builds on other platforms are possible by following our detailed build instructions.

Other changes

A full commit history for this release is available at Eclipse OpenJ9 v0.19.0.