An instance representing the new Reiwa era has been added to this update. Unlike other eras, there is no public field for this era. It can be obtained by calling `JapaneseEra.of(3)` or `JapaneseEra.valueOf("Reiwa")`. JDK 13 and later will have a new public field to represent this era.
The placeholder name, "`NewEra`", for the Japanese era that started from May 1st, 2019 has been replaced with the new official name. Applications that relied on the placeholder name (see JDK-8202088) to obtain the new era singleton (`JapaneseEra.valueOf("NewEra")`) will no longer work.