Merge branch '3.5.x'

Closes gh-48106

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

@@ -56,7 +56,7 @@ import org.springframework.boot.testsupport.gradle.testkit.GradleBuild;
  */
 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 @@ class PluginXmlParser {
 
 			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 class WebProperties {
 		 */
 		private boolean addMappings = true;
 
-		private boolean customized = false;
+		private boolean customized;
 
 		private final Chain chain = new Chain();
 
@@ -151,7 +151,7 @@ public class WebProperties {
 		 */
 		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 class WebProperties {
 			 * 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 @@ public class WebProperties {
 				 */
 				public static class Content {
 
-					private boolean customized = false;
+					private boolean customized;
 
 					/**
 					 * Whether to enable the content Version Strategy.
@@ -287,7 +287,7 @@ public class WebProperties {
 				 */
 				public static class Fixed {
 
-					private boolean customized = false;
+					private boolean customized;
 
 					/**
 					 * Whether to enable the fixed Version Strategy.
@@ -346,7 +346,7 @@ public class WebProperties {
 		 */
 		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 @@ public class WebProperties {
 			 */
 			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 @@ class JmxAutoConfigurationTests {
 	@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 @@ class FileWatcherTests {
 
 		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 @@ import static org.assertj.core.api.Assertions.assertThat;
 class SpringBootTestWebEnvironmentMockTests {
 
 	@Value("${value}")
-	private int value = 0;
+	private int value;
 
 	@Autowired
 	private WebApplicationContext context;

core/spring-boot-testcontainers/src/dockerTest/java/org/springframework/boot/testcontainers/ImportTestcontainersTests.java

@@ -144,7 +144,7 @@ class ImportTestcontainersTests {
 	@ImportTestcontainers
 	static class NullContainer {
 
-		static @Nullable PostgreSQLContainer container = null;
+		static @Nullable PostgreSQLContainer container;
 
 	}
 

core/spring-boot/src/main/java/org/springframework/boot/SpringApplicationShutdownHook.java

@@ -63,7 +63,7 @@ class SpringApplicationShutdownHook implements Runnable {
 
 	private final AtomicBoolean shutdownHookAdded = new AtomicBoolean();
 
-	private volatile boolean shutdownHookAdditionEnabled = false;
+	private volatile boolean shutdownHookAdditionEnabled;
 
 	private boolean inProgress;
 

core/spring-boot/src/main/java/org/springframework/boot/SpringBootExceptionHandler.java

@@ -48,7 +48,7 @@ class SpringBootExceptionHandler implements UncaughtExceptionHandler {
 
 	private final List<Throwable> loggedExceptions = new ArrayList<>();
 
-	private int exitCode = 0;
+	private int exitCode;
 
 	SpringBootExceptionHandler(@Nullable UncaughtExceptionHandler parent) {
 		this.parent = parent;

core/spring-boot/src/main/java/org/springframework/boot/context/logging/LoggingApplicationListener.java

@@ -193,7 +193,7 @@ public class LoggingApplicationListener implements GenericApplicationListener {
 
 	private boolean parseArgs = true;
 
-	private @Nullable LogLevel springBootLogging = null;
+	private @Nullable LogLevel springBootLogging;
 
 	@Override
 	public boolean supportsEventType(ResolvableType resolvableType) {

core/spring-boot/src/main/java/org/springframework/boot/context/properties/source/SpringIterableConfigurationPropertySource.java

@@ -373,7 +373,7 @@ class SpringIterableConfigurationPropertySource extends SpringConfigurationPrope
 
 		private final @Nullable ConfigurationPropertyName[] names;
 
-		private int index = 0;
+		private int index;
 
 		ConfigurationPropertyNamesIterator(@Nullable ConfigurationPropertyName[] names) {
 			this.names = names;

core/spring-boot/src/test/java/org/springframework/boot/logging/log4j2/TestLog4J2LoggingSystem.java

@@ -22,7 +22,7 @@ import org.jspecify.annotations.Nullable;
 
 class TestLog4J2LoggingSystem extends Log4J2LoggingSystem {
 
-	private boolean disableSelfInitialization = false;
+	private boolean disableSelfInitialization;
 
 	TestLog4J2LoggingSystem(String contextName) {
 		// Tests add resources to the thread context classloader

integration-test/spring-boot-test-integration-tests/src/test/java/org/springframework/boot/web/server/test/AbstractSpringBootTestEmbeddedReactiveWebEnvironmentTests.java

@@ -53,10 +53,10 @@ import static org.assertj.core.api.Assertions.assertThat;
 abstract class AbstractSpringBootTestEmbeddedReactiveWebEnvironmentTests {
 
 	@LocalServerPort
-	private int port = 0;
+	private int port;
 
 	@Value("${value}")
-	private int value = 0;
+	private int value;
 
 	@Autowired
 	private ReactiveWebApplicationContext context;

integration-test/spring-boot-test-integration-tests/src/test/java/org/springframework/boot/web/server/test/AbstractSpringBootTestWebServerWebEnvironmentTests.java

@@ -54,10 +54,10 @@ import static org.assertj.core.api.Assertions.assertThat;
 abstract class AbstractSpringBootTestWebServerWebEnvironmentTests {
 
 	@LocalServerPort
-	private int port = 0;
+	private int port;
 
 	@Value("${value}")
-	private int value = 0;
+	private int value;
 
 	@Autowired
 	private WebApplicationContext context;

loader/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/MainClassFinder.java

@@ -295,7 +295,7 @@ public abstract class MainClassFinder {
 
 		private boolean mainMethodFound;
 
-		private boolean java25OrLater = false;
+		private boolean java25OrLater;
 
 		ClassDescriptor() {
 			super(SpringAsmInfo.ASM_VERSION);

loader/spring-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/SizeCalculatingEntryWriter.java

@@ -89,7 +89,7 @@ final class SizeCalculatingEntryWriter implements EntryWriter {
 	 */
 	private static class SizeCalculatingOutputStream extends OutputStream {
 
-		private int size = 0;
+		private int size;
 
 		private @Nullable File tempFile;
 

loader/spring-boot-loader/src/main/java/org/springframework/boot/loader/zip/VirtualDataBlock.java

@@ -34,7 +34,7 @@ class VirtualDataBlock implements DataBlock {
 
 	private long size;
 
-	private volatile int lastReadPart = 0;
+	private volatile int lastReadPart;
 
 	/**
 	 * Create a new {@link VirtualDataBlock} instance. The {@link #setParts(Collection)}

module/spring-boot-activemq/src/main/java/org/springframework/boot/activemq/autoconfigure/ActiveMQProperties.java

@@ -69,7 +69,7 @@ public class ActiveMQProperties {
 	 * Whether to stop message delivery before re-delivering messages from a rolled back
 	 * transaction. This implies that message order is not preserved when this is enabled.
 	 */
-	private boolean nonBlockingRedelivery = false;
+	private boolean nonBlockingRedelivery;
 
 	/**
 	 * Time to wait on message sends for a response. Set it to 0 to wait forever.

module/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/context/properties/ConfigurationPropertiesReportEndpointTests.java

@@ -477,7 +477,7 @@ class ConfigurationPropertiesReportEndpointTests {
 
 		private String myTestProperty = "654321";
 
-		private @Nullable String nullValue = null;
+		private @Nullable String nullValue;
 
 		private Duration duration = Duration.ofSeconds(10);
 

module/spring-boot-amqp/src/main/java/org/springframework/boot/amqp/autoconfigure/RabbitProperties.java

@@ -940,7 +940,7 @@ public class RabbitProperties {
 		 * Whether to fail if the queues declared by the container are not available on
 		 * the broker.
 		 */
-		private boolean missingQueuesFatal = false;
+		private boolean missingQueuesFatal;
 
 		public @Nullable Integer getConsumersPerQueue() {
 			return this.consumersPerQueue;

module/spring-boot-batch-jdbc/src/test/java/org/springframework/boot/batch/jdbc/autoconfigure/BatchJdbcAutoConfigurationTests.java

@@ -637,7 +637,7 @@ class BatchJdbcAutoConfigurationTests {
 		Job discreteJob() {
 			AbstractJob job = new AbstractJob("discreteRegisteredJob") {
 
-				private static int count = 0;
+				private static int count;
 
 				@Override
 				public Collection<String> getStepNames() {

module/spring-boot-batch/src/test/java/org/springframework/boot/batch/autoconfigure/BatchJobLauncherAutoConfigurationTests.java

@@ -142,7 +142,7 @@ class BatchJobLauncherAutoConfigurationTests {
 		Job discreteJob() {
 			AbstractJob job = new AbstractJob("discreteRegisteredJob") {
 
-				private static int count = 0;
+				private static int count;
 
 				@Override
 				public Collection<String> getStepNames() {

module/spring-boot-data-commons/src/main/java/org/springframework/boot/data/autoconfigure/web/DataWebProperties.java

@@ -60,7 +60,7 @@ public class DataWebProperties {
 		 * Whether to expose and assume 1-based page number indexes. Defaults to "false",
 		 * meaning a page number of 0 in the request equals the first page.
 		 */
-		private boolean oneIndexedParameters = false;
+		private boolean oneIndexedParameters;
 
 		/**
 		 * General prefix to be prepended to the page number and page size parameters.

module/spring-boot-data-redis/src/main/java/org/springframework/boot/data/redis/autoconfigure/DataRedisProperties.java

@@ -42,7 +42,7 @@ public class DataRedisProperties {
 	/**
 	 * Database index used by the connection factory.
 	 */
-	private int database = 0;
+	private int database;
 
 	/**
 	 * Connection URL. Overrides host, port, username, password, and database. Example:
@@ -258,7 +258,7 @@ public class DataRedisProperties {
 		 * setting only has an effect if both it and time between eviction runs are
 		 * positive.
 		 */
-		private int minIdle = 0;
+		private int minIdle;
 
 		/**
 		 * Maximum number of connections that can be allocated by the pool at a given

module/spring-boot-devtools/src/main/java/org/springframework/boot/devtools/autoconfigure/DevToolsProperties.java

@@ -193,7 +193,7 @@ public class DevToolsProperties {
 		/**
 		 * Whether to enable a livereload.com-compatible server.
 		 */
-		private boolean enabled = false;
+		private boolean enabled;
 
 		/**
 		 * Server port.

module/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/RestarterTests.java

@@ -205,7 +205,7 @@ class RestarterTests {
 	@EnableScheduling
 	static class SampleApplication {
 
-		private int count = 0;
+		private int count;
 
 		private static final AtomicBoolean restart = new AtomicBoolean();
 
@@ -233,7 +233,7 @@ class RestarterTests {
 
 	static class CloseCountingApplicationListener implements ApplicationListener<ContextClosedEvent> {
 
-		static int closed = 0;
+		static int closed;
 
 		@Override
 		public void onApplicationEvent(ContextClosedEvent event) {

module/spring-boot-elasticsearch/src/main/java/org/springframework/boot/elasticsearch/autoconfigure/ElasticsearchProperties.java

@@ -67,7 +67,7 @@ public class ElasticsearchProperties {
 	/**
 	 * Whether to enable socket keep alive between client and Elasticsearch.
 	 */
-	private boolean socketKeepAlive = false;
+	private boolean socketKeepAlive;
 
 	/**
 	 * Prefix added to the path of every request sent to Elasticsearch.

module/spring-boot-flyway/src/main/java/org/springframework/boot/flyway/autoconfigure/FlywayMigrationInitializer.java

@@ -36,7 +36,7 @@ public class FlywayMigrationInitializer implements InitializingBean, Ordered {
 
 	private final @Nullable FlywayMigrationStrategy migrationStrategy;
 
-	private int order = 0;
+	private int order;
 
 	/**
 	 * Create a new {@link FlywayMigrationInitializer} instance.

module/spring-boot-flyway/src/main/java/org/springframework/boot/flyway/autoconfigure/FlywayProperties.java

@@ -252,7 +252,7 @@ public class FlywayProperties {
 	 * Whether to validate migrations and callbacks whose scripts do not obey the correct
 	 * naming convention.
 	 */
-	private boolean validateMigrationNaming = false;
+	private boolean validateMigrationNaming;
 
 	/**
 	 * Whether to automatically call validate when performing a migration.

module/spring-boot-freemarker/src/main/java/org/springframework/boot/freemarker/autoconfigure/FreeMarkerProperties.java

@@ -94,19 +94,19 @@ public class FreeMarkerProperties {
 	 * Whether all request attributes should be added to the model prior to merging with
 	 * the template.
 	 */
-	private boolean exposeRequestAttributes = false;
+	private boolean exposeRequestAttributes;
 
 	/**
 	 * Whether all HttpSession attributes should be added to the model prior to merging
 	 * with the template.
 	 */
-	private boolean exposeSessionAttributes = false;
+	private boolean exposeSessionAttributes;
 
 	/**
 	 * Whether HttpServletRequest attributes are allowed to override (hide) controller
 	 * generated model attributes of the same name.
 	 */
-	private boolean allowRequestOverride = false;
+	private boolean allowRequestOverride;
 
 	/**
 	 * Whether to expose a RequestContext for use by Spring's macro library, under the
@@ -118,7 +118,7 @@ public class FreeMarkerProperties {
 	 * Whether HttpSession attributes are allowed to override (hide) controller generated
 	 * model attributes of the same name.
 	 */
-	private boolean allowSessionOverride = false;
+	private boolean allowSessionOverride;
 
 	/**
 	 * Well-known FreeMarker keys which are passed to FreeMarker's Configuration.

module/spring-boot-graphql/src/main/java/org/springframework/boot/graphql/autoconfigure/GraphQlProperties.java

@@ -192,7 +192,7 @@ public class GraphQlProperties {
 			 * Whether the endpoint that prints the schema is enabled. Schema is available
 			 * under spring.graphql.http.path + "/schema".
 			 */
-			private boolean enabled = false;
+			private boolean enabled;
 
 			public boolean isEnabled() {
 				return this.enabled;
@@ -216,7 +216,7 @@ public class GraphQlProperties {
 		/**
 		 * Whether the default GraphiQL UI is enabled.
 		 */
-		private boolean enabled = false;
+		private boolean enabled;
 
 		public String getPath() {
 			return this.path;

module/spring-boot-graphql/src/test/java/org/springframework/boot/graphql/autoconfigure/GraphQlAutoConfigurationTests.java

@@ -346,7 +346,7 @@ class GraphQlAutoConfigurationTests {
 
 		public static class CustomRuntimeWiringConfigurer implements RuntimeWiringConfigurer {
 
-			public boolean applied = false;
+			public boolean applied;
 
 			@Override
 			public void configure(RuntimeWiring.Builder builder) {
@@ -366,7 +366,7 @@ class GraphQlAutoConfigurationTests {
 
 		public static class CustomGraphQlSourceBuilderCustomizer implements GraphQlSourceBuilderCustomizer {
 
-			public boolean applied = false;
+			public boolean applied;
 
 			@Override
 			public void customize(GraphQlSource.SchemaResourceBuilder builder) {

module/spring-boot-groovy-templates/src/main/java/org/springframework/boot/groovy/template/autoconfigure/GroovyTemplateProperties.java

@@ -98,19 +98,19 @@ public class GroovyTemplateProperties {
 	 * Whether all request attributes should be added to the model prior to merging with
 	 * the template.
 	 */
-	private boolean exposeRequestAttributes = false;
+	private boolean exposeRequestAttributes;
 
 	/**
 	 * Whether all HttpSession attributes should be added to the model prior to merging
 	 * with the template.
 	 */
-	private boolean exposeSessionAttributes = false;
+	private boolean exposeSessionAttributes;
 
 	/**
 	 * Whether HttpServletRequest attributes are allowed to override (hide) controller
 	 * generated model attributes of the same name.
 	 */
-	private boolean allowRequestOverride = false;
+	private boolean allowRequestOverride;
 
 	/**
 	 * Whether to expose a RequestContext for use by Spring's macro library, under the
@@ -122,7 +122,7 @@ public class GroovyTemplateProperties {
 	 * Whether HttpSession attributes are allowed to override (hide) controller generated
 	 * model attributes of the same name.
 	 */
-	private boolean allowSessionOverride = false;
+	private boolean allowSessionOverride;
 
 	/**
 	 * Whether models that are assignable to CharSequence are escaped automatically.

module/spring-boot-h2console/src/main/java/org/springframework/boot/h2console/autoconfigure/H2ConsoleProperties.java

@@ -40,7 +40,7 @@ public class H2ConsoleProperties {
 	/**
 	 * Whether to enable the console.
 	 */
-	private boolean enabled = false;
+	private boolean enabled;
 
 	private final Settings settings = new Settings();
 
@@ -72,12 +72,12 @@ public class H2ConsoleProperties {
 		/**
 		 * Whether to enable trace output.
 		 */
-		private boolean trace = false;
+		private boolean trace;
 
 		/**
 		 * Whether to enable remote access.
 		 */
-		private boolean webAllowOthers = false;
+		private boolean webAllowOthers;
 
 		/**
 		 * Password to access preferences and tools of H2 Console.

module/spring-boot-integration/src/main/java/org/springframework/boot/integration/autoconfigure/IntegrationProperties.java

@@ -122,7 +122,7 @@ public class IntegrationProperties {
 		 * Whether to throw an exception when a reply is not expected anymore by a
 		 * gateway.
 		 */
-		private boolean throwExceptionOnLateReply = false;
+		private boolean throwExceptionOnLateReply;
 
 		/**
 		 * List of message header names that should not be populated into Message

module/spring-boot-jackson/src/main/java/org/springframework/boot/jackson/autoconfigure/JacksonProperties.java

@@ -113,7 +113,7 @@ public class JacksonProperties {
 	 * Whether to configure Jackson 3 with the same defaults as Spring Boot previously
 	 * used for Jackson 2.
 	 */
-	private boolean useJackson2Defaults = false;
+	private boolean useJackson2Defaults;
 
 	/**
 	 * Whether to find and add modules to the auto-configured JsonMapper.Builder using

module/spring-boot-jackson2/src/main/java/org/springframework/boot/jackson2/autoconfigure/Jackson2Properties.java

@@ -114,7 +114,7 @@ public class Jackson2Properties {
 	 * Time zone used when formatting dates. For instance, "America/Los_Angeles" or
 	 * "GMT+10".
 	 */
-	private @Nullable TimeZone timeZone = null;
+	private @Nullable TimeZone timeZone;
 
 	/**
 	 * Locale used for formatting.

module/spring-boot-jdbc/src/main/java/org/springframework/boot/jdbc/autoconfigure/health/DataSourceHealthIndicatorProperties.java

@@ -32,7 +32,7 @@ public class DataSourceHealthIndicatorProperties {
 	 * Whether to ignore AbstractRoutingDataSources when creating database health
 	 * indicators.
 	 */
-	private boolean ignoreRoutingDataSources = false;
+	private boolean ignoreRoutingDataSources;
 
 	public boolean isIgnoreRoutingDataSources() {
 		return this.ignoreRoutingDataSources;

module/spring-boot-jetty/src/main/java/org/springframework/boot/jetty/GracefulShutdown.java

@@ -46,7 +46,7 @@ final class GracefulShutdown {
 
 	private final Supplier<Integer> activeRequests;
 
-	private volatile boolean aborted = false;
+	private volatile boolean aborted;
 
 	GracefulShutdown(Server server, Supplier<Integer> activeRequests) {
 		this.server = server;

module/spring-boot-jetty/src/main/java/org/springframework/boot/jetty/autoconfigure/JettyServerProperties.java

@@ -147,7 +147,7 @@ public class JettyServerProperties {
 		/**
 		 * Enable access log.
 		 */
-		private boolean enabled = false;
+		private boolean enabled;
 
 		/**
 		 * Log format.

module/spring-boot-jms/src/main/java/org/springframework/boot/jms/autoconfigure/JmsProperties.java

@@ -38,7 +38,7 @@ public class JmsProperties {
 	/**
 	 * Whether the default destination type is topic.
 	 */
-	private boolean pubSubDomain = false;
+	private boolean pubSubDomain;
 
 	/**
 	 * Connection factory JNDI name. When set, takes precedence to others connection
@@ -49,7 +49,7 @@ public class JmsProperties {
 	/**
 	 * Whether the subscription is durable.
 	 */
-	private boolean subscriptionDurable = false;
+	private boolean subscriptionDurable;
 
 	/**
 	 * Client id of the connection.
@@ -116,7 +116,7 @@ public class JmsProperties {
 		/**
 		 * Whether to cache message consumers.
 		 */
-		private boolean consumers = false;
+		private boolean consumers;
 
 		/**
 		 * Whether to cache message producers.
@@ -402,7 +402,7 @@ public class JmsProperties {
 			/**
 			 * Whether to use transacted sessions.
 			 */
-			private boolean transacted = false;
+			private boolean transacted;
 
 			public AcknowledgeMode getAcknowledgeMode() {
 				return this.acknowledgeMode;

module/spring-boot-jpa/src/main/java/org/springframework/boot/jpa/autoconfigure/JpaProperties.java

@@ -64,12 +64,12 @@ public class JpaProperties {
 	/**
 	 * Whether to initialize the schema on startup.
 	 */
-	private boolean generateDdl = false;
+	private boolean generateDdl;
 
 	/**
 	 * Whether to enable logging of SQL statements.
 	 */
-	private boolean showSql = false;
+	private boolean showSql;
 
 	/**
 	 * Register OpenEntityManagerInViewInterceptor. Binds a JPA EntityManager to the

module/spring-boot-kafka/src/main/java/org/springframework/boot/kafka/autoconfigure/KafkaProperties.java

@@ -1045,13 +1045,13 @@ public class KafkaProperties {
 		 * Whether the container should fail to start if at least one of the configured
 		 * topics are not present on the broker.
 		 */
-		private boolean missingTopicsFatal = false;
+		private boolean missingTopicsFatal;
 
 		/**
 		 * Whether the container stops after the current record is processed or after all
 		 * the records from the previous poll are processed.
 		 */
-		private boolean immediateStop = false;
+		private boolean immediateStop;
 
 		/**
 		 * Whether to auto start the container.
@@ -1664,12 +1664,12 @@ public class KafkaProperties {
 		/**
 		 * Cleanup the application’s local state directory on startup.
 		 */
-		private boolean onStartup = false;
+		private boolean onStartup;
 
 		/**
 		 * Cleanup the application’s local state directory on shutdown.
 		 */
-		private boolean onShutdown = false;
+		private boolean onShutdown;
 
 		public boolean isOnStartup() {
 			return this.onStartup;

module/spring-boot-ldap/src/main/java/org/springframework/boot/ldap/autoconfigure/LdapProperties.java

@@ -159,13 +159,13 @@ public class LdapProperties {
 		 * Whether PartialResultException should be ignored in searches through the
 		 * LdapTemplate.
 		 */
-		private boolean ignorePartialResultException = false;
+		private boolean ignorePartialResultException;
 
 		/**
 		 * Whether NameNotFoundException should be ignored in searches through the
 		 * LdapTemplate.
 		 */
-		private boolean ignoreNameNotFoundException = false;
+		private boolean ignoreNameNotFoundException;
 
 		/**
 		 * Whether SizeLimitExceededException should be ignored in searches through the

module/spring-boot-ldap/src/main/java/org/springframework/boot/ldap/autoconfigure/embedded/EmbeddedLdapProperties.java

@@ -39,7 +39,7 @@ public class EmbeddedLdapProperties {
 	/**
 	 * Embedded LDAP port.
 	 */
-	private int port = 0;
+	private int port;
 
 	/**
 	 * Embedded LDAP credentials.

module/spring-boot-mail/src/main/java/org/springframework/boot/mail/autoconfigure/MailProperties.java

@@ -153,7 +153,7 @@ public class MailProperties {
 		 * Whether to enable SSL support. If enabled, 'mail.(protocol).ssl.enable'
 		 * property is set to 'true'.
 		 */
-		private boolean enabled = false;
+		private boolean enabled;
 
 		/**
 		 * SSL bundle name. If set, 'mail.(protocol).ssl.socketFactory' property is set to

module/spring-boot-micrometer-metrics/src/main/java/org/springframework/boot/micrometer/metrics/autoconfigure/export/elastic/ElasticProperties.java

@@ -85,7 +85,7 @@ public class ElasticProperties extends StepRegistryProperties {
 	 * Whether to enable _source in the default index template when auto-creating the
 	 * index.
 	 */
-	private boolean enableSource = false;
+	private boolean enableSource;
 
 	public String getHost() {
 		return this.host;

module/spring-boot-micrometer-metrics/src/main/java/org/springframework/boot/micrometer/metrics/autoconfigure/export/stackdriver/StackdriverProperties.java

@@ -54,7 +54,7 @@ public class StackdriverProperties extends StepRegistryProperties {
 	 * published as the GAUGE MetricKind. When true, counter metrics are published as the
 	 * CUMULATIVE MetricKind.
 	 */
-	private boolean useSemanticMetricTypes = false;
+	private boolean useSemanticMetricTypes;
 
 	/**
 	 * Prefix for metric type. Valid prefixes are described in the Google Cloud

module/spring-boot-micrometer-tracing-brave/src/main/java/org/springframework/boot/micrometer/tracing/brave/autoconfigure/BraveTracingProperties.java

@@ -31,7 +31,7 @@ public class BraveTracingProperties {
 	 * Whether the propagation type and tracing backend support sharing the span ID
 	 * between client and server spans. Requires B3 propagation and a compatible backend.
 	 */
-	private boolean spanJoiningSupported = false;
+	private boolean spanJoiningSupported;
 
 	public boolean isSpanJoiningSupported() {
 		return this.spanJoiningSupported;

module/spring-boot-mongodb/src/main/java/org/springframework/boot/mongodb/autoconfigure/StandardMongoClientSettingsBuilderCustomizer.java

@@ -39,7 +39,7 @@ public class StandardMongoClientSettingsBuilderCustomizer implements MongoClient
 
 	private final MongoConnectionDetails connectionDetails;
 
-	private int order = 0;
+	private int order;
 
 	public StandardMongoClientSettingsBuilderCustomizer(MongoConnectionDetails connectionDetails,
 			UuidRepresentation uuidRepresentation) {

module/spring-boot-mustache/src/main/java/org/springframework/boot/mustache/autoconfigure/MustacheProperties.java

@@ -146,13 +146,13 @@ public class MustacheProperties {
 		 * Whether HttpServletRequest attributes are allowed to override (hide) controller
 		 * generated model attributes of the same name.
 		 */
-		private boolean allowRequestOverride = false;
+		private boolean allowRequestOverride;
 
 		/**
 		 * Whether HttpSession attributes are allowed to override (hide) controller
 		 * generated model attributes of the same name.
 		 */
-		private boolean allowSessionOverride = false;
+		private boolean allowSessionOverride;
 
 		/**
 		 * Whether to enable template caching.
@@ -168,13 +168,13 @@ public class MustacheProperties {
 		 * Whether all request attributes should be added to the model prior to merging
 		 * with the template.
 		 */
-		private boolean exposeRequestAttributes = false;
+		private boolean exposeRequestAttributes;
 
 		/**
 		 * Whether all HttpSession attributes should be added to the model prior to
 		 * merging with the template.
 		 */
-		private boolean exposeSessionAttributes = false;
+		private boolean exposeSessionAttributes;
 
 		/**
 		 * Whether to expose a RequestContext for use by Spring's macro library, under the

module/spring-boot-neo4j/src/main/java/org/springframework/boot/neo4j/autoconfigure/Neo4jProperties.java

@@ -153,7 +153,7 @@ public class Neo4jProperties {
 		/**
 		 * Whether to log leaked sessions.
 		 */
-		private boolean logLeakedSessions = false;
+		private boolean logLeakedSessions;
 
 		/**
 		 * Maximum amount of connections in the connection pool towards a single database.
@@ -225,7 +225,7 @@ public class Neo4jProperties {
 		/**
 		 * Whether the driver should use encrypted traffic.
 		 */
-		private boolean encrypted = false;
+		private boolean encrypted;
 
 		/**
 		 * Trust strategy to use.

module/spring-boot-pulsar/src/main/java/org/springframework/boot/pulsar/autoconfigure/PulsarProperties.java

@@ -370,7 +370,7 @@ public class PulsarProperties {
 		 * Whether to throw an exception if any failure is encountered during server
 		 * shutdown while enforcing stop policy on functions.
 		 */
-		private boolean propagateStopFailures = false;
+		private boolean propagateStopFailures;
 
 		public boolean isFailFast() {
 			return this.failFast;
@@ -589,13 +589,13 @@ public class PulsarProperties {
 		/**
 		 * Priority level for shared subscription consumers.
 		 */
-		private int priorityLevel = 0;
+		private int priorityLevel;
 
 		/**
 		 * Whether to read messages from the compacted topic rather than the full message
 		 * backlog.
 		 */
-		private boolean readCompacted = false;
+		private boolean readCompacted;
 
 		/**
 		 * Dead letter policy to use.
@@ -611,7 +611,7 @@ public class PulsarProperties {
 		/**
 		 * Whether to auto retry messages.
 		 */
-		private boolean retryEnable = false;
+		private boolean retryEnable;
 
 		public @Nullable String getName() {
 			return this.name;

module/spring-boot-quartz/src/main/java/org/springframework/boot/quartz/autoconfigure/QuartzProperties.java

@@ -59,12 +59,12 @@ public class QuartzProperties {
 	/**
 	 * Whether to wait for running jobs to complete on shutdown.
 	 */
-	private boolean waitForJobsToCompleteOnShutdown = false;
+	private boolean waitForJobsToCompleteOnShutdown;
 
 	/**
 	 * Whether configured jobs should overwrite existing job definitions.
 	 */
-	private boolean overwriteExistingJobs = false;
+	private boolean overwriteExistingJobs;
 
 	/**
 	 * Additional Quartz Scheduler properties.

module/spring-boot-r2dbc/src/main/java/org/springframework/boot/r2dbc/autoconfigure/R2dbcProperties.java

@@ -140,7 +140,7 @@ public class R2dbcProperties {
 		/**
 		 * Minimal number of idle connections.
 		 */
-		private int minIdle = 0;
+		private int minIdle;
 
 		/**
 		 * Maximum amount of time that a connection is allowed to sit idle in the pool.

module/spring-boot-security-oauth2-authorization-server/src/main/java/org/springframework/boot/security/oauth2/server/authorization/autoconfigure/servlet/OAuth2AuthorizationServerProperties.java

@@ -50,7 +50,7 @@ public class OAuth2AuthorizationServerProperties implements InitializingBean {
 	 * the issuer identifier enables supporting multiple issuers per host in a
 	 * multi-tenant hosting configuration.
 	 */
-	private boolean multipleIssuersAllowed = false;
+	private boolean multipleIssuersAllowed;
 
 	/**
 	 * Registered clients of the Authorization Server.
@@ -294,7 +294,7 @@ public class OAuth2AuthorizationServerProperties implements InitializingBean {
 		/**
 		 * Whether authorization consent is required when the client requests access.
 		 */
-		private boolean requireAuthorizationConsent = false;
+		private boolean requireAuthorizationConsent;
 
 		/**
 		 * URL for the client's JSON Web Key Set.

module/spring-boot-servlet/src/main/java/org/springframework/boot/servlet/autoconfigure/MultipartProperties.java

@@ -79,13 +79,13 @@ public class MultipartProperties {
 	 * Whether to resolve the multipart request lazily at the time of file or parameter
 	 * access.
 	 */
-	private boolean resolveLazily = false;
+	private boolean resolveLazily;
 
 	/**
 	 * Whether to resolve the multipart request strictly complying with the Servlet
 	 * specification, only to be used for "multipart/form-data" requests.
 	 */
-	private boolean strictServletCompliance = false;
+	private boolean strictServletCompliance;
 
 	public boolean isEnabled() {
 		return this.enabled;

module/spring-boot-sql/src/main/java/org/springframework/boot/sql/autoconfigure/init/SqlInitializationProperties.java

@@ -65,7 +65,7 @@ public class SqlInitializationProperties {
 	/**
 	 * Whether initialization should continue when an error occurs.
 	 */
-	private boolean continueOnError = false;
+	private boolean continueOnError;
 
 	/**
 	 * Statement separator in the schema and data scripts.

module/spring-boot-thymeleaf/src/main/java/org/springframework/boot/thymeleaf/autoconfigure/ThymeleafProperties.java

@@ -106,7 +106,7 @@ public class ThymeleafProperties {
 	 * Whether hidden form inputs acting as markers for checkboxes should be rendered
 	 * before the checkbox element itself.
 	 */
-	private boolean renderHiddenMarkersBeforeCheckboxes = false;
+	private boolean renderHiddenMarkersBeforeCheckboxes;
 
 	private final Servlet servlet = new Servlet();
 

module/spring-boot-tomcat/src/main/java/org/springframework/boot/tomcat/GracefulShutdown.java

@@ -44,7 +44,7 @@ final class GracefulShutdown {
 
 	private final Tomcat tomcat;
 
-	private volatile boolean aborted = false;
+	private volatile boolean aborted;
 
 	GracefulShutdown(Tomcat tomcat) {
 		this.tomcat = tomcat;

module/spring-boot-tomcat/src/main/java/org/springframework/boot/tomcat/autoconfigure/TomcatServerProperties.java

@@ -407,7 +407,7 @@ public class TomcatServerProperties {
 		/**
 		 * Enable access log.
 		 */
-		private boolean enabled = false;
+		private boolean enabled;
 
 		/**
 		 * Whether logging of the request will only be enabled if
@@ -458,7 +458,7 @@ public class TomcatServerProperties {
 		 * Whether to check for log file existence so it can be recreated if an external
 		 * process has renamed it.
 		 */
-		private boolean checkExists = false;
+		private boolean checkExists;
 
 		/**
 		 * Whether to enable access log rotation.
@@ -469,7 +469,7 @@ public class TomcatServerProperties {
 		 * Whether to defer inclusion of the date stamp in the file name until rotate
 		 * time.
 		 */
-		private boolean renameOnRotate = false;
+		private boolean renameOnRotate;
 
 		/**
 		 * Number of days to retain the access log files before they are removed.
@@ -484,13 +484,13 @@ public class TomcatServerProperties {
 		/**
 		 * Whether to use IPv6 canonical representation format as defined by RFC 5952.
 		 */
-		private boolean ipv6Canonical = false;
+		private boolean ipv6Canonical;
 
 		/**
 		 * Set request attributes for the IP address, Hostname, protocol, and port used
 		 * for the request.
 		 */
-		private boolean requestAttributesEnabled = false;
+		private boolean requestAttributesEnabled;
 
 		/**
 		 * Whether to buffer output such that it is flushed only periodically.

module/spring-boot-web-server/src/main/java/org/springframework/boot/web/server/autoconfigure/ServerProperties.java

@@ -235,7 +235,7 @@ public class ServerProperties {
 		/**
 		 * Whether to register the default Servlet with the container.
 		 */
-		private boolean registerDefaultServlet = false;
+		private boolean registerDefaultServlet;
 
 		private final Encoding encoding = new Encoding();
 

module/spring-boot-webflux/src/main/java/org/springframework/boot/webflux/autoconfigure/WebFluxProperties.java

@@ -161,7 +161,7 @@ public class WebFluxProperties {
 		/**
 		 * Whether RFC 9457 Problem Details support should be enabled.
 		 */
-		private boolean enabled = false;
+		private boolean enabled;
 
 		public boolean isEnabled() {
 			return this.enabled;

module/spring-boot-webflux/src/test/java/org/springframework/boot/webflux/autoconfigure/WebFluxAutoConfigurationTests.java

@@ -1095,7 +1095,7 @@ class WebFluxAutoConfigurationTests {
 	@Configuration(proxyBeanMethods = false)
 	static class CustomRequestMappingHandlerAdapter {
 
-		private int handlerAdapters = 0;
+		private int handlerAdapters;
 
 		@Bean
 		WebFluxRegistrations webFluxRegistrationsHandlerAdapter() {
@@ -1126,7 +1126,7 @@ class WebFluxAutoConfigurationTests {
 	@Configuration(proxyBeanMethods = false)
 	static class CustomRequestMappingHandlerMapping {
 
-		private int handlerMappings = 0;
+		private int handlerMappings;
 
 		@Bean
 		WebFluxRegistrations webFluxRegistrationsHandlerMapping() {

module/spring-boot-webmvc/src/main/java/org/springframework/boot/webmvc/autoconfigure/WebMvcProperties.java

@@ -54,7 +54,7 @@ public class WebMvcProperties {
 	/**
 	 * Whether to dispatch TRACE requests to the FrameworkServlet doService method.
 	 */
-	private boolean dispatchTraceRequest = false;
+	private boolean dispatchTraceRequest;
 
 	/**
 	 * Whether to dispatch OPTIONS requests to the FrameworkServlet doService method.
@@ -76,7 +76,7 @@ public class WebMvcProperties {
 	 * Whether to enable warn logging of exceptions resolved by a
 	 * "HandlerExceptionResolver", except for "DefaultHandlerExceptionResolver".
 	 */
-	private boolean logResolvedException = false;
+	private boolean logResolvedException;
 
 	/**
 	 * Path pattern used for static resources.
@@ -315,7 +315,7 @@ public class WebMvcProperties {
 		 * Whether a request parameter ("format" by default) should be used to determine
 		 * the requested media type.
 		 */
-		private boolean favorParameter = false;
+		private boolean favorParameter;
 
 		/**
 		 * Query parameter name to use when "favor-parameter" is enabled.
@@ -459,7 +459,7 @@ public class WebMvcProperties {
 		/**
 		 * Whether RFC 9457 Problem Details support should be enabled.
 		 */
-		private boolean enabled = false;
+		private boolean enabled;
 
 		public boolean isEnabled() {
 			return this.enabled;

module/spring-boot-webmvc/src/test/java/org/springframework/boot/webmvc/autoconfigure/WebMvcAutoConfigurationTests.java

@@ -1332,7 +1332,7 @@ class WebMvcAutoConfigurationTests {
 	@Configuration(proxyBeanMethods = false)
 	static class CustomRequestMappingHandlerAdapter {
 
-		private int handlerAdapters = 0;
+		private int handlerAdapters;
 
 		@Bean
 		WebMvcRegistrations webMvcRegistrationsHandlerAdapter() {
@@ -1356,7 +1356,7 @@ class WebMvcAutoConfigurationTests {
 	@Configuration(proxyBeanMethods = false)
 	static class CustomExceptionHandlerExceptionResolver {
 
-		private int exceptionResolvers = 0;
+		private int exceptionResolvers;
 
 		@Bean
 		WebMvcRegistrations webMvcRegistrationsExceptionResolver() {

system-test/spring-boot-image-system-tests/src/systemTest/java/org/springframework/boot/image/paketo/PaketoBuilderTests.java

@@ -569,7 +569,7 @@ class PaketoBuilderTests {
 
 	private static class DigestCapturingCondition extends Condition<Object> {
 
-		private static String digest = null;
+		private static String digest;
 
 		DigestCapturingCondition() {
 			super(predicate(), "a value starting with 'sha256:'");