Generate default values from Duration and Period .ZERO

Closes gh-23082

Author: wilkinsona

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/fieldvalues/javac/JavaCompilerFieldValuesParser.java

@@ -98,6 +98,8 @@ private static class FieldCollector implements TreeVisitor {
 			values.put("StandardCharsets.UTF_8", "UTF-8");
 			values.put("StandardCharsets.UTF_16", "UTF-16");
 			values.put("StandardCharsets.US_ASCII", "US-ASCII");
+			values.put("Duration.ZERO", 0);
+			values.put("Period.ZERO", 0);
 			WELL_KNOWN_STATIC_FINALS = Collections.unmodifiableMap(values);
 		}
 

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationprocessor/fieldvalues/AbstractFieldValuesProcessorTests.java

@@ -94,6 +94,7 @@ void getFieldValues() throws Exception {
 		assertThat(values.get("durationMinutes")).isEqualTo("30m");
 		assertThat(values.get("durationHours")).isEqualTo("40h");
 		assertThat(values.get("durationDays")).isEqualTo("50d");
+		assertThat(values.get("durationZero")).isEqualTo(0);
 		assertThat(values.get("dataSizeNone")).isNull();
 		assertThat(values.get("dataSizeBytes")).isEqualTo("5B");
 		assertThat(values.get("dataSizeKilobytes")).isEqualTo("10KB");
@@ -105,6 +106,7 @@ void getFieldValues() throws Exception {
 		assertThat(values.get("periodWeeks")).isEqualTo("2w");
 		assertThat(values.get("periodMonths")).isEqualTo("10m");
 		assertThat(values.get("periodYears")).isEqualTo("15y");
+		assertThat(values.get("periodZero")).isEqualTo(0);
 	}
 
 	@SupportedAnnotationTypes({ "org.springframework.boot.configurationsample.ConfigurationProperties" })

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/test/java/org/springframework/boot/configurationsample/fieldvalues/FieldValues.java

@@ -125,6 +125,8 @@ public class FieldValues {
 
 	private Duration durationDays = Duration.ofDays(50);
 
+	private Duration durationZero = Duration.ZERO;
+
 	private DataSize dataSizeNone;
 
 	private DataSize dataSizeBytes = DataSize.ofBytes(5);
@@ -147,4 +149,6 @@ public class FieldValues {
 
 	private Period periodYears = Period.ofYears(15);
 
+	private Period periodZero = Period.ZERO;
+
 }