src/jdk.localedata/share/classes/sun/text/resources/ext/JavaTimeSupplementary_in.java

*** 146,155 ****
--- 146,156 ----
              "M",
              "Meiji",
              "Taish\u014d",
              "Sh\u014dwa",
              "Heisei",
+             "Reiwa",
          };
  
          final String[] sharedEras = {
              "Sebelum R.O.C.",
              "R.O.C.",