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

@@ -146,10 +146,11 @@
             "M",
             "Meiji",
             "Taish\u014d",
             "Sh\u014dwa",
             "Heisei",
+            "Reiwa",
         };
 
         final String[] sharedEras = {
             "Sebelum R.O.C.",
             "R.O.C.",