Names for Gregorian eras returned from `java.time.format` APIs are now correctly retrieved from the CLDR locale data. Prior to this change, these APIs incorrectly used names from the legacy COMPAT locale data. For example, the Gregorian era names "BCE"/"CE" are now returned for the ROOT locale, instead of "BC"/"AD" that are in the COMPAT locale data. For possible compatibility issues and workarounds, refer to JDK-8320431 for more details.