Polishing

spring-context/src/main/java/org/springframework/format/datetime/standard/InstantFormatter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -45,12 +45,12 @@ public class InstantFormatter implements Formatter<Instant> {
 			return Instant.ofEpochMilli(Long.parseLong(text));
 		}
 		catch (NumberFormatException ex) {
-			if (text.length() > 0 && Character.isAlphabetic(text.charAt(0))) {
+			if (!text.isEmpty() && Character.isAlphabetic(text.charAt(0))) {
 				// assuming RFC-1123 value a la "Tue, 3 Jun 2008 11:05:30 GMT"
 				return Instant.from(DateTimeFormatter.RFC_1123_DATE_TIME.parse(text));
 			}
 			else {
-				// assuming UTC instant a la "2007-12-03T10:15:30.00Z"
+				// assuming UTC instant a la "2007-12-03T10:15:30.000Z"
 				return Instant.parse(text);
 			}
 		}

spring-context/src/test/java/org/springframework/format/datetime/standard/DateTimeFormattingTests.java

@@ -644,10 +644,10 @@ class DateTimeFormattingTests {
 		@DateTimeFormat(style = "M-")
 		private LocalDate styleLocalDate;
 
-		@DateTimeFormat(style = "S-", fallbackPatterns = { "yyyy-MM-dd", "yyyyMMdd", "yyyy.MM.dd" })
+		@DateTimeFormat(style = "S-", fallbackPatterns = {"yyyy-MM-dd", "yyyyMMdd", "yyyy.MM.dd"})
 		private LocalDate styleLocalDateWithFallbackPatterns;
 
-		@DateTimeFormat(pattern = "yyyy-MM-dd", fallbackPatterns = { "M/d/yy", "yyyyMMdd", "yyyy.MM.dd" })
+		@DateTimeFormat(pattern = "yyyy-MM-dd", fallbackPatterns = {"M/d/yy", "yyyyMMdd", "yyyy.MM.dd"})
 		private LocalDate patternLocalDateWithFallbackPatterns;
 
 		private LocalTime localTime;
@@ -655,7 +655,7 @@ class DateTimeFormattingTests {
 		@DateTimeFormat(style = "-M")
 		private LocalTime styleLocalTime;
 
-		@DateTimeFormat(style = "-M", fallbackPatterns = { "HH:mm:ss", "HH:mm"})
+		@DateTimeFormat(style = "-M", fallbackPatterns = {"HH:mm:ss", "HH:mm"})
 		private LocalTime styleLocalTimeWithFallbackPatterns;
 
 		private LocalDateTime localDateTime;
@@ -675,7 +675,7 @@ class DateTimeFormattingTests {
 		@DateTimeFormat(iso = ISO.DATE_TIME)
 		private LocalDateTime isoLocalDateTime;
 
-		@DateTimeFormat(iso = ISO.DATE_TIME, fallbackPatterns = { "yyyy-MM-dd HH:mm:ss", "M/d/yy HH:mm"})
+		@DateTimeFormat(iso = ISO.DATE_TIME, fallbackPatterns = {"yyyy-MM-dd HH:mm:ss", "M/d/yy HH:mm"})
 		private LocalDateTime isoLocalDateTimeWithFallbackPatterns;
 
 		private Instant instant;

spring-context/src/test/java/org/springframework/format/datetime/standard/InstantFormatterTests.java

@@ -20,6 +20,7 @@ import java.text.ParseException;
 import java.time.Instant;
 import java.time.format.DateTimeFormatter;
 import java.time.temporal.ChronoUnit;
+import java.util.Locale;
 import java.util.Random;
 import java.util.stream.Stream;
 
@@ -50,13 +51,12 @@ class InstantFormatterTests {
 
 	private final InstantFormatter instantFormatter = new InstantFormatter();
 
+
 	@ParameterizedTest
 	@ArgumentsSource(ISOSerializedInstantProvider.class)
 	void should_parse_an_ISO_formatted_string_representation_of_an_Instant(String input) throws ParseException {
 		Instant expected = DateTimeFormatter.ISO_INSTANT.parse(input, Instant::from);
-
+		Instant actual = instantFormatter.parse(input, Locale.US);
-		Instant actual = instantFormatter.parse(input, null);
-
 		assertThat(actual).isEqualTo(expected);
 	}
 
@@ -64,9 +64,7 @@ class InstantFormatterTests {
 	@ArgumentsSource(RFC1123SerializedInstantProvider.class)
 	void should_parse_an_RFC1123_formatted_string_representation_of_an_Instant(String input) throws ParseException {
 		Instant expected = DateTimeFormatter.RFC_1123_DATE_TIME.parse(input, Instant::from);
-
+		Instant actual = instantFormatter.parse(input, Locale.US);
-		Instant actual = instantFormatter.parse(input, null);
-
 		assertThat(actual).isEqualTo(expected);
 	}
 
@@ -74,20 +72,18 @@ class InstantFormatterTests {
 	@ArgumentsSource(RandomInstantProvider.class)
 	void should_serialize_an_Instant_using_ISO_format_and_ignoring_Locale(Instant input) {
 		String expected = DateTimeFormatter.ISO_INSTANT.format(input);
-
+		String actual = instantFormatter.print(input, Locale.US);
-		String actual = instantFormatter.print(input, null);
-
 		assertThat(actual).isEqualTo(expected);
 	}
 
 	@ParameterizedTest
 	@ArgumentsSource(RandomEpochMillisProvider.class)
 	void should_parse_into_an_Instant_from_epoch_milli(Instant input) throws ParseException {
-		Instant actual = instantFormatter.parse(Long.toString(input.toEpochMilli()), null);
+		Instant actual = instantFormatter.parse(Long.toString(input.toEpochMilli()), Locale.US);
-
 		assertThat(actual).isEqualTo(input);
 	}
 
+
 	private static class RandomInstantProvider implements ArgumentsProvider {
 
 		private static final long DATA_SET_SIZE = 10;
@@ -109,6 +105,7 @@ class InstantFormatterTests {
 		}
 	}
 
+
 	private static class ISOSerializedInstantProvider extends RandomInstantProvider {
 
 		@Override
@@ -117,6 +114,7 @@ class InstantFormatterTests {
 		}
 	}
 
+
 	private static class RFC1123SerializedInstantProvider extends RandomInstantProvider {
 
 		// RFC-1123 supports only 4-digit years
@@ -130,6 +128,8 @@ class InstantFormatterTests {
 					.map(DateTimeFormatter.RFC_1123_DATE_TIME.withZone(systemDefault())::format);
 		}
 	}
+
+
 	private static final class RandomEpochMillisProvider implements ArgumentsProvider {
 
 		private static final long DATA_SET_SIZE = 10;