Summary

Allow additional code points to support GB18030-2022 from beyond Unicode 6.2 which Java SE 8 is based upon.

Problem

China National Standard body (CESI) has recently published GB18030-2022 which is an updated version of the GB18030 standard and brings GB18030 in sync with Unicode version 11.0. Since Java SE 8 supports characters defined in Unicode 6.2, some characters defined in the new GB18030 standard cannot be represented.

Solution

Allow code points that are required by the Implementation Level 1 definition in the GB18030-2022 standard. Additionally required code points are in the range of U+9FCD to U+9FEF, totaling 35 code points.

Specification

Modify the second paragraph in the Unicode Conformance section in the class description of java.lang.Character class as follows:

diff a/jdk/src/share/classes/java/lang/Character.java b/jdk/src/share/classes/java/lang/Character.java
--- a/jdk/src/share/classes/java/lang/Character.java
+++ b/jdk/src/share/classes/java/lang/Character.java
@@ -50,17 +50,21 @@
  * assigned Unicode code point or character range. The file is available
  * from the Unicode Consortium at
  * <a href="http://www.unicode.org">http://www.unicode.org</a>.
  * <p>
  * The Java SE 8 Platform uses character information from version 6.2
- * of the Unicode Standard, with two extensions. First, the Java SE 8 Platform
- * allows an implementation of class {@code Character} to use the Japanese Era
- * code point, {@code U+32FF}, from the first version of the Unicode Standard
- * after 6.2 that assigns the code point. Second, in recognition of the fact
+ * of the Unicode Standard, with three extensions. First, in recognition of the fact
  * that new currencies appear frequently, the Java SE 8 Platform allows an
  * implementation of class {@code Character} to use the Currency Symbols
- * block from version 10.0 of the Unicode Standard. Consequently, the
+ * block from version 10.0 of the Unicode Standard. Second, the Java SE 8 Platform
+ * allows an implementation of class {@code Character} to use the code points
+ * in the range of {@code U+9FCD} to {@code U+9FEF} from version 11.0 of the
+ * Unicode Standard, in order for the class to allow the "Implementation
+ * Level 1" of the Chinese GB18030-2022 standard. Third, the Java SE 8 Platform
+ * allows an implementation of class {@code Character} to use the Japanese Era
+ * code point, {@code U+32FF}, from the Unicode Standard version 12.1.
+ * Consequently, the
  * behavior of fields and methods of class {@code Character} may vary across
  * implementations of the Java SE 8 Platform when processing the aforementioned
  * code points ( outside of version 6.2 ), except for the following methods
  * that define Java identifiers:
  * {@link #isJavaIdentifierStart(int)}, {@link #isJavaIdentifierStart(char)},