Merge branch '3.5.x'

Closes gh-48106

Author: snicoll

build-plugin/spring-boot-gradle-plugin/src/test/java/org/springframework/boot/gradle/testkit/PluginClasspathGradleBuild.java

@@ -56,7 +56,7 @@
  */
 public class PluginClasspathGradleBuild extends GradleBuild {
 
-	private boolean kotlin = false;
+	private boolean kotlin;
 
 	public PluginClasspathGradleBuild(BuildOutput buildOutput) {
 		super(buildOutput);

buildSrc/src/main/java/org/springframework/boot/build/mavenplugin/PluginXmlParser.java

@@ -142,7 +142,7 @@ public Iterator<Node> iterator() {
 
 			return new Iterator<>() {
 
-				private int index = 0;
+				private int index;
 
 				@Override
 				public boolean hasNext() {

buildpack/spring-boot-buildpack-platform/src/test/java/org/springframework/boot/buildpack/platform/socket/FileDescriptorTests.java

@@ -31,7 +31,7 @@ class FileDescriptorTests {
 
 	private final int sourceHandle = 123;
 
-	private int closedHandle = 0;
+	private int closedHandle;
 
 	@Test
 	void acquireReturnsHandle() throws Exception {

config/checkstyle/checkstyle.xml

@@ -16,6 +16,7 @@
 	<module name="com.puppycrawl.tools.checkstyle.TreeWalker">
 		<module name="io.spring.javaformat.checkstyle.check.SpringDeprecatedCheck" />
 		<module name="io.spring.javaformat.checkstyle.check.SpringJUnit5Check" />
+		<module name="ExplicitInitialization" />
 		<module
 			name="com.puppycrawl.tools.checkstyle.checks.imports.IllegalImportCheck">
 			<property name="regexp" value="true" />

core/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/context/MessageSourceProperties.java

@@ -76,13 +76,13 @@ public class MessageSourceProperties {
 	 * Whether to always apply the MessageFormat rules, parsing even messages without
 	 * arguments.
 	 */
-	private boolean alwaysUseMessageFormat = false;
+	private boolean alwaysUseMessageFormat;
 
 	/**
 	 * Whether to use the message code as the default message instead of throwing a
 	 * "NoSuchMessageException". Recommended during development only.
 	 */
-	private boolean useCodeAsDefaultMessage = false;
+	private boolean useCodeAsDefaultMessage;
 
 	public List<String> getBasename() {
 		return this.basename;

core/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jmx/JmxProperties.java

@@ -33,12 +33,12 @@ public class JmxProperties {
 	/**
 	 * Expose Spring's management beans to the JMX domain.
 	 */
-	private boolean enabled = false;
+	private boolean enabled;
 
 	/**
 	 * Whether unique runtime object names should be ensured.
 	 */
-	private boolean uniqueNames = false;
+	private boolean uniqueNames;
 
 	/**
 	 * MBeanServer bean name.

core/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/WebProperties.java

@@ -101,7 +101,7 @@ public static class Resources {
 		 */
 		private boolean addMappings = true;
 
-		private boolean customized = false;
+		private boolean customized;
 
 		private final Chain chain = new Chain();
 
@@ -151,7 +151,7 @@ public boolean hasBeenCustomized() {
 		 */
 		public static class Chain {
 
-			boolean customized = false;
+			boolean customized;
 
 			/**
 			 * Whether to enable the Spring Resource Handling chain. By default, disabled
@@ -169,7 +169,7 @@ public static class Chain {
 			 * brotli). Checks for a resource name with the '.gz' or '.br' file
 			 * extensions.
 			 */
-			private boolean compressed = false;
+			private boolean compressed;
 
 			private final Strategy strategy = new Strategy();
 
@@ -246,7 +246,7 @@ private boolean hasBeenCustomized() {
 				 */
 				public static class Content {
 
-					private boolean customized = false;
+					private boolean customized;
 
 					/**
 					 * Whether to enable the content Version Strategy.
@@ -287,7 +287,7 @@ private boolean hasBeenCustomized() {
 				 */
 				public static class Fixed {
 
-					private boolean customized = false;
+					private boolean customized;
 
 					/**
 					 * Whether to enable the fixed Version Strategy.
@@ -346,7 +346,7 @@ private boolean hasBeenCustomized() {
 		 */
 		public static class Cache {
 
-			private boolean customized = false;
+			private boolean customized;
 
 			/**
 			 * Cache period for the resources served by the resource handler. If a
@@ -398,7 +398,7 @@ private boolean hasBeenCustomized() {
 			 */
 			public static class Cachecontrol {
 
-				private boolean customized = false;
+				private boolean customized;
 
 				/**
 				 * Maximum time the response should be cached, in seconds if no duration

core/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jmx/JmxAutoConfigurationTests.java

@@ -130,7 +130,7 @@ Counter counter() {
 	@ManagedResource
 	public static class Counter {
 
-		private int counter = 0;
+		private int counter;
 
 		@ManagedAttribute
 		public int get() {

core/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/ssl/FileWatcherTests.java

@@ -336,7 +336,7 @@ private static final class WaitingCallback implements Runnable {
 
 		private CountDownLatch latch = new CountDownLatch(1);
 
-		volatile boolean changed = false;
+		volatile boolean changed;
 
 		@Override
 		public void run() {

core/spring-boot-test/src/test/java/org/springframework/boot/test/context/SpringBootTestWebEnvironmentMockTests.java

@@ -46,7 +46,7 @@
 class SpringBootTestWebEnvironmentMockTests {
 
 	@Value("${value}")
-	private int value = 0;
+	private int value;
 
 	@Autowired
 	private WebApplicationContext context;