Update configuration properties to use Duration

Update appropriate configuration properties to use the `Duration`
type, rather than an ad-hoc mix of milliseconds or seconds.

Configuration properties can now be defined in a consistent and readable
way. For example `server.session.timeout=5m`.

Properties that were previously declared using seconds are annotated
with `@DurationUnit` to ensure a smooth upgrade experience. For example
`server.session.timeout=20` continues to mean 20 seconds.

Fixes gh-11080

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/autoconfigure/LocalDevToolsAutoConfigurationTests.java

@@ -17,6 +17,7 @@
 package org.springframework.boot.devtools.autoconfigure;
 
 import java.io.File;
+import java.time.Duration;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
@@ -120,7 +121,7 @@ public class LocalDevToolsAutoConfigurationTests {
 	public void resourceCachePeriodIsZero() throws Exception {
 		this.context = initializeAndRun(WebResourcesConfig.class);
 		ResourceProperties properties = this.context.getBean(ResourceProperties.class);
-		assertThat(properties.getCachePeriod()).isEqualTo(0);
+		assertThat(properties.getCachePeriod()).isEqualTo(Duration.ZERO);
 	}
 
 	@Test

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/classpath/ClassPathFileSystemWatcherTests.java

@@ -18,6 +18,7 @@ package org.springframework.boot.devtools.classpath;
 
 import java.io.File;
 import java.net.URL;
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -104,7 +105,8 @@ public class ClassPathFileSystemWatcherTests {
 
 		@Bean
 		public ClassPathFileSystemWatcher watcher() {
-			FileSystemWatcher watcher = new FileSystemWatcher(false, 100, 10);
+			FileSystemWatcher watcher = new FileSystemWatcher(false,
+					Duration.ofMillis(100), Duration.ofMillis(10));
 			URL[] urls = this.environment.getProperty("urls", URL[].class);
 			return new ClassPathFileSystemWatcher(
 					new MockFileSystemWatcherFactory(watcher), restartStrategy(), urls);

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/filewatch/FileSystemWatcherTests.java

@@ -20,6 +20,7 @@ import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashSet;
@@ -66,21 +67,21 @@ public class FileSystemWatcherTests {
 	public void pollIntervalMustBePositive() throws Exception {
 		this.thrown.expect(IllegalArgumentException.class);
 		this.thrown.expectMessage("PollInterval must be positive");
-		new FileSystemWatcher(true, 0, 1);
+		new FileSystemWatcher(true, Duration.ofMillis(0), Duration.ofMillis(1));
 	}
 
 	@Test
 	public void quietPeriodMustBePositive() throws Exception {
 		this.thrown.expect(IllegalArgumentException.class);
 		this.thrown.expectMessage("QuietPeriod must be positive");
-		new FileSystemWatcher(true, 1, 0);
+		new FileSystemWatcher(true, Duration.ofMillis(1), Duration.ofMillis(0));
 	}
 
 	@Test
 	public void pollIntervalMustBeGreaterThanQuietPeriod() throws Exception {
 		this.thrown.expect(IllegalArgumentException.class);
 		this.thrown.expectMessage("PollInterval must be greater than QuietPeriod");
-		new FileSystemWatcher(true, 1, 1);
+		new FileSystemWatcher(true, Duration.ofMillis(1), Duration.ofMillis(1));
 	}
 
 	@Test
@@ -272,7 +273,8 @@ public class FileSystemWatcherTests {
 	}
 
 	private void setupWatcher(long pollingInterval, long quietPeriod) {
-		this.watcher = new FileSystemWatcher(false, pollingInterval, quietPeriod);
+		this.watcher = new FileSystemWatcher(false, Duration.ofMillis(pollingInterval),
+				Duration.ofMillis(quietPeriod));
 		this.watcher.addListener(
 				(changeSet) -> FileSystemWatcherTests.this.changes.add(changeSet));
 	}