21.12.0.0

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21.12.0.0

Release date: December 20, 2021

This release corresponds to the following OpenJDK versions:

Major Version	OpenJDK Version
7	7u322
8	8u312
11	11.0.13+8
13	13.0.9+3
15	15.0.5+3
17	17.0.1+12

What’s New

Photon OS is now supported.
Improved performance of string collation and character iteration. You can enable the use of the custom implementation of RuleBasedCollator using the option -XX:+UseModifiedRuleBasedCollator. This option is false by default.
Docker images for Prime are now available.

Resolved Issues

Issue ID Description

Issue ID	Description
ZVM-21048	When `-XX:+UseLargePages` is used and the number of static huge pages reserved by nr_hugepages is insufficient for the total heap, Prime failed to start. Now it matches OpenJDK behavior and continues as expected.
ZVM-22049	OldGC is not triggered often enough during idle time when NewGCs are occurring.
ZVM-22063	Map OpenJDK command line option `UseCountedLoopSafepoints` onto `KeepSafepointsInCountedLoops`.
ZVM-19635	Avoid lock in `ByteArrayInputStream.read` if it is used as an input of `ObjectInputStream`.
ZVM-20678	Improved performance of string collation and iteration.

ZVM-21048

When -XX:+UseLargePages is used and the number of static huge pages reserved by nr_hugepages is insufficient for the total heap, Prime failed to start. Now it matches OpenJDK behavior and continues as expected.

ZVM-22049

OldGC is not triggered often enough during idle time when NewGCs are occurring.

ZVM-22063

Map OpenJDK command line option UseCountedLoopSafepoints onto KeepSafepointsInCountedLoops.

ZVM-19635

Avoid lock in ByteArrayInputStream.read if it is used as an input of ObjectInputStream.

ZVM-20678

Improved performance of string collation and iteration.

Known Issues

There are no new issues to report in this release.