src/java.base/share/classes/java/time/format/DateTimeFormatterBuilder.java

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--- 117,127 ----
  import java.util.Set;
  import java.util.TimeZone;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.ConcurrentMap;
  
+ import sun.text.spi.JavaTimeDateTimePatternProvider;
  import sun.util.locale.provider.LocaleProviderAdapter;
  import sun.util.locale.provider.LocaleResources;
  import sun.util.locale.provider.TimeZoneNameUtility;
  
  /**
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          Objects.requireNonNull(locale, "locale");
          Objects.requireNonNull(chrono, "chrono");
          if (dateStyle == null && timeStyle == null) {
              throw new IllegalArgumentException("Either dateStyle or timeStyle must be non-null");
          }
!         LocaleResources lr = LocaleProviderAdapter.getResourceBundleBased().getLocaleResources(locale);
!         String pattern = lr.getJavaTimeDateTimePattern(
!                 convertStyle(timeStyle), convertStyle(dateStyle), chrono.getCalendarType());
          return pattern;
      }
  
      /**
       * Converts the given FormatStyle to the java.text.DateFormat style.
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          Objects.requireNonNull(locale, "locale");
          Objects.requireNonNull(chrono, "chrono");
          if (dateStyle == null && timeStyle == null) {
              throw new IllegalArgumentException("Either dateStyle or timeStyle must be non-null");
          }
!         LocaleProviderAdapter adapter = LocaleProviderAdapter.getAdapter(JavaTimeDateTimePatternProvider.class, locale);
!         JavaTimeDateTimePatternProvider provider = adapter.getJavaTimeDateTimePatternProvider();
!         String pattern = provider.getJavaTimeDateTimePattern(convertStyle(timeStyle),
!                          convertStyle(dateStyle), chrono.getCalendarType(), locale);
          return pattern;
      }
  
      /**
       * Converts the given FormatStyle to the java.text.DateFormat style.