This release upgrades the Unicode version to 15.1, which includes updated versions of the Unicode Character Database and Unicode Standard Annexes #9, #15, and #29:
- The `java.lang.Character` class supports the Unicode Character Database, which adds 627 characters, for a total of 149,813 characters. The addition includes one new `UnicodeBlock`, which consists of urgently needed CJK ideographs, synchronized with planned additions to the Chinese national standard, GB 18030.
- The `java.text.Bidi` and `java.text.Normalizer` classes support Unicode Standard Annexes, #9 and #15, respectively.
- The `java.util.regex` package supports Extended Grapheme Clusters based on the Unicode Standard Annex #29.

For more details about Unicode 15.1, refer to the [Unicode Consortium’s release note](https://unicode.org/versions/Unicode15.1.0/).