code: private void tryRegisterThreeTenBackport() {
          try {
              tryRegister("org.threeten.bp.Instant", "parse");
              tryRegister("org.threeten.bp.Duration", "parse");
              tryRegister("org.threeten.bp.LocalDate", "parse");
              tryRegister("org.threeten.bp.LocalTime", "parse");
              tryRegister("org.threeten.bp.LocalDateTime", "parse");
              tryRegister("org.threeten.bp.OffsetTime", "parse");
              tryRegister("org.threeten.bp.OffsetDateTime", "parse");
              tryRegister("org.threeten.bp.ZonedDateTime", "parse");
              tryRegister("org.threeten.bp.Year", "parse");
              tryRegister("org.threeten.bp.YearMonth", "parse");
              tryRegister("org.threeten.bp.MonthDay", "parse");
              tryRegister("org.threeten.bp.Period", "parse");
              tryRegister("org.threeten.bp.ZoneOffset", "of");
              tryRegister("org.threeten.bp.ZoneId", "of");
              tryRegister("org.threeten.bp.ZoneRegion", "of");
  
          } catch (Throwable ex) {
              if (LOG) {
                  System.err.println("tryRegisterThreeTenBackport: " + ex);
              }
          }
      }
docs: Tries to register ThreeTen backport classes.