Apply SingleSpaceSeparator Checkstyle module

This commit also fixes its violations.

Closes gh-31469

Author: izeye

spring-aop/src/main/java/org/aopalliance/intercept/ConstructorInterceptor.java

@@ -43,7 +43,7 @@
  *
  * @author Rod Johnson
  */
-public interface ConstructorInterceptor extends Interceptor  {
+public interface ConstructorInterceptor extends Interceptor {
 
 	/**
 	 * Implement this method to perform extra treatments before and

spring-aop/src/main/java/org/springframework/aop/aspectj/AbstractAspectJAdvice.java

@@ -307,7 +307,7 @@ protected void setReturningNameNoCheck(String name) {
 				this.discoveredReturningType = ClassUtils.forName(name, getAspectClassLoader());
 			}
 			catch (Throwable ex) {
-				throw new IllegalArgumentException("Returning name '" + name  +
+				throw new IllegalArgumentException("Returning name '" + name +
 						"' is neither a valid argument name nor the fully-qualified " +
 						"name of a Java type on the classpath. Root cause: " + ex);
 			}
@@ -342,7 +342,7 @@ protected void setThrowingNameNoCheck(String name) {
 				this.discoveredThrowingType = ClassUtils.forName(name, getAspectClassLoader());
 			}
 			catch (Throwable ex) {
-				throw new IllegalArgumentException("Throwing name '" + name  +
+				throw new IllegalArgumentException("Throwing name '" + name +
 						"' is neither a valid argument name nor the fully-qualified " +
 						"name of a Java type on the classpath. Root cause: " + ex);
 			}

spring-aop/src/test/java/org/springframework/aop/config/AopNamespaceHandlerEventTests.java

@@ -45,8 +45,8 @@ class AopNamespaceHandlerEventTests {
 
 	private static final Class<?> CLASS = AopNamespaceHandlerEventTests.class;
 
-	private static final Resource CONTEXT =  qualifiedResource(CLASS, "context.xml");
-	private static final Resource POINTCUT_EVENTS_CONTEXT =  qualifiedResource(CLASS, "pointcutEvents.xml");
+	private static final Resource CONTEXT = qualifiedResource(CLASS, "context.xml");
+	private static final Resource POINTCUT_EVENTS_CONTEXT = qualifiedResource(CLASS, "pointcutEvents.xml");
 	private static final Resource POINTCUT_REF_CONTEXT = qualifiedResource(CLASS, "pointcutRefEvents.xml");
 	private static final Resource DIRECT_POINTCUT_EVENTS_CONTEXT = qualifiedResource(CLASS, "directPointcutEvents.xml");
 

spring-aspects/src/test/java/org/springframework/cache/config/AnnotatedClassCacheableService.java

@@ -209,7 +209,7 @@ public Object multiCache(Object arg1) {
 	}
 
 	@Override
-	@Caching(evict = { @CacheEvict("primary"), @CacheEvict(cacheNames = "secondary", key = "#a0"),  @CacheEvict(cacheNames = "primary", key = "#p0 + 'A'") })
+	@Caching(evict = { @CacheEvict("primary"), @CacheEvict(cacheNames = "secondary", key = "#a0"), @CacheEvict(cacheNames = "primary", key = "#p0 + 'A'") })
 	public Object multiEvict(Object arg1) {
 		return this.counter.getAndIncrement();
 	}

spring-aspects/src/test/java/org/springframework/context/annotation/aspectj/AnnotationBeanConfigurerTests.java

@@ -37,7 +37,7 @@ public class AnnotationBeanConfigurerTests {
 
 	@Test
 	public void injection() {
-		try (AnnotationConfigApplicationContext context = new  AnnotationConfigApplicationContext(Config.class)) {
+		try (AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class)) {
 			ShouldBeConfiguredBySpring myObject = new ShouldBeConfiguredBySpring();
 			assertThat(myObject.getName()).isEqualTo("Rod");
 		}

spring-beans/src/main/java/org/springframework/beans/factory/groovy/GroovyBeanDefinitionReader.java

@@ -476,7 +476,7 @@ private GroovyBeanDefinitionWrapper invokeBeanDefiningMethod(String beanName, Ob
 					this.currentBeanDefinition = new GroovyBeanDefinitionWrapper(beanName, beanClass);
 				}
 			}
-			else  {
+			else {
 				this.currentBeanDefinition = new GroovyBeanDefinitionWrapper(
 						beanName, beanClass, resolveConstructorArguments(args, 1, args.length));
 			}

spring-beans/src/test/java/org/springframework/beans/factory/DefaultListableBeanFactoryTests.java

@@ -1161,7 +1161,7 @@ void registerExistingSingletonWithNameOverriding() {
 		assertThat(lbf.getBean("singletonObject")).isEqualTo(singletonObject);
 		assertThat(test.getSpouse()).isEqualTo(singletonObject);
 
-		Map<?, ?>  beansOfType = lbf.getBeansOfType(TestBean.class, false, true);
+		Map<?, ?> beansOfType = lbf.getBeansOfType(TestBean.class, false, true);
 		assertThat(beansOfType).hasSize(2);
 		assertThat(beansOfType.containsValue(test)).isTrue();
 		assertThat(beansOfType.containsValue(singletonObject)).isTrue();

spring-beans/src/test/java/org/springframework/beans/factory/aot/DefaultBeanRegistrationCodeFragmentsTests.java

@@ -218,7 +218,7 @@ public CodeBlock generateInstanceSupplierCode(GenerationContext generationContex
 	}
 
 	private BeanRegistrationCodeFragments createCustomCodeFragments(RegisteredBean registeredBean, UnaryOperator<BeanRegistrationCodeFragments> customFragments) {
-		BeanRegistrationAotContribution aotContribution =  BeanRegistrationAotContribution.
+		BeanRegistrationAotContribution aotContribution = BeanRegistrationAotContribution.
 				withCustomCodeFragments(customFragments);
 		BeanRegistrationCodeFragments defaultCodeFragments = createInstance(registeredBean);
 		return aotContribution.customizeBeanRegistrationCodeFragments(

spring-beans/src/test/java/org/springframework/beans/factory/parsing/NullSourceExtractorTests.java

@@ -28,7 +28,7 @@ public class NullSourceExtractorTests {
 
 	@Test
 	public void testPassThroughContract() throws Exception {
-		Object source  = new Object();
+		Object source = new Object();
 		Object extractedSource = new NullSourceExtractor().extractSource(source, null);
 		assertThat(extractedSource).as("The contract of NullSourceExtractor states that the extraction *always* return null").isNull();
 	}

spring-beans/src/test/java/org/springframework/beans/factory/parsing/PassThroughSourceExtractorTests.java

@@ -30,7 +30,7 @@ public class PassThroughSourceExtractorTests {
 
 	@Test
 	public void testPassThroughContract() throws Exception {
-		Object source  = new Object();
+		Object source = new Object();
 		Object extractedSource = new PassThroughSourceExtractor().extractSource(source, null);
 		assertThat(extractedSource).as("The contract of PassThroughSourceExtractor states that the supplied " +
 				"source object *must* be returned as-is").isSameAs(source);

spring-context-support/src/main/java/org/springframework/mail/javamail/JavaMailSenderImpl.java

@@ -490,7 +490,7 @@ protected Transport connectTransport() throws MessagingException {
 	 * @see #getProtocol()
 	 */
 	protected Transport getTransport(Session session) throws NoSuchProviderException {
-		String protocol	= getProtocol();
+		String protocol = getProtocol();
 		if (protocol == null) {
 			protocol = session.getProperty("mail.transport.protocol");
 			if (protocol == null) {

spring-context/src/main/java/org/springframework/cache/interceptor/AbstractCacheResolver.java

@@ -73,7 +73,7 @@ public CacheManager getCacheManager() {
 	}
 
 	@Override
-	public void afterPropertiesSet()  {
+	public void afterPropertiesSet() {
 		Assert.notNull(this.cacheManager, "CacheManager is required");
 	}
 

spring-context/src/main/java/org/springframework/cache/interceptor/CacheInterceptor.java

@@ -84,7 +84,7 @@ public Object invoke(final MethodInvocation invocation) throws Throwable {
 	private static class KotlinDelegate {
 
 		public static Publisher<?> invokeSuspendingFunction(Method method, Object target, Object... args) {
-			Continuation<?>  continuation = (Continuation<?>) args[args.length - 1];
+			Continuation<?> continuation = (Continuation<?>) args[args.length - 1];
 			CoroutineContext coroutineContext = continuation.getContext().minusKey(Job.Key);
 			return CoroutinesUtils.invokeSuspendingFunction(coroutineContext, method, target, args);
 		}

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

@@ -37,7 +37,7 @@
  * @author Sam Brannen
  * @since 3.2
  */
-public class DateTimeFormatAnnotationFormatterFactory  extends EmbeddedValueResolutionSupport
+public class DateTimeFormatAnnotationFormatterFactory extends EmbeddedValueResolutionSupport
 		implements AnnotationFormatterFactory<DateTimeFormat> {
 
 	private static final Set<Class<?>> FIELD_TYPES = Set.of(Date.class, Calendar.class, Long.class);

spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolExecutorFactoryBean.java

@@ -158,7 +158,7 @@ protected ExecutorService initializeExecutor(
 			ThreadFactory threadFactory, RejectedExecutionHandler rejectedExecutionHandler) {
 
 		BlockingQueue<Runnable> queue = createQueue(this.queueCapacity);
-		ThreadPoolExecutor executor  = createExecutor(this.corePoolSize, this.maxPoolSize,
+		ThreadPoolExecutor executor = createExecutor(this.corePoolSize, this.maxPoolSize,
 				this.keepAliveSeconds, queue, threadFactory, rejectedExecutionHandler);
 		if (this.allowCoreThreadTimeOut) {
 			executor.allowCoreThreadTimeOut(true);

spring-context/src/main/java/org/springframework/scheduling/support/BitsCronField.java

@@ -247,7 +247,7 @@ private void setBit(int index) {
 	}
 
 	private void clearBit(int index) {
-		this.bits &=  ~(1L << index);
+		this.bits &= ~(1L << index);
 	}
 
 	@Override

spring-context/src/main/java/org/springframework/validation/DataBinder.java

@@ -949,7 +949,7 @@ private Object createObject(ResolvableType objectType, String nestedPath, ValueR
 
 				if (value == null && !BeanUtils.isSimpleValueType(param.nestedIfOptional().getNestedParameterType())) {
 					ResolvableType type = ResolvableType.forMethodParameter(param);
-					args[i]  = createObject(type, paramPath + ".", valueResolver);
+					args[i] = createObject(type, paramPath + ".", valueResolver);
 				}
 				else {
 					try {

spring-context/src/main/java/org/springframework/validation/beanvalidation/MethodValidationAdapter.java

@@ -345,7 +345,7 @@ else if (node.getKind().equals(ElementKind.RETURN_VALUE)) {
 	}
 
 	private MethodParameter initMethodParameter(Method method, int index) {
-		MethodParameter	parameter = new MethodParameter(method, index);
+		MethodParameter parameter = new MethodParameter(method, index);
 		parameter.initParameterNameDiscovery(this.parameterNameDiscoverer);
 		return parameter;
 	}

spring-context/src/test/java/org/springframework/aop/aspectj/autoproxy/spr3064/SPR3064Tests.java

@@ -39,7 +39,7 @@ void serviceIsAdvised() {
 		ClassPathXmlApplicationContext ctx =
 			new ClassPathXmlApplicationContext(getClass().getSimpleName() + ".xml", getClass());
 
-		Service service  = ctx.getBean(Service.class);
+		Service service = ctx.getBean(Service.class);
 		assertThatRuntimeException()
 			.isThrownBy(service::serveMe)
 			.withMessage("advice invoked");

spring-context/src/test/java/org/springframework/aop/framework/autoproxy/BeanNameAutoProxyCreatorTests.java

@@ -166,7 +166,7 @@ void customTargetSourceCreatorsApplyOnlyToConfiguredBeanNames() {
 	}
 
 
-	private void jdkAssertions(ITestBean tb, int nopInterceptorCount)  {
+	private void jdkAssertions(ITestBean tb, int nopInterceptorCount) {
 		NopInterceptor nop = (NopInterceptor) beanFactory.getBean("nopInterceptor");
 		assertThat(nop.getCount()).isEqualTo(0);
 		assertThat(AopUtils.isJdkDynamicProxy(tb)).isTrue();

spring-context/src/test/java/org/springframework/beans/factory/xml/XmlBeanFactoryTestTypes.java

@@ -418,7 +418,7 @@ public String replaceMe(int someParam) {
 
 	@Override
 	public String replaceMe(String someParam) {
-		return "replaceMe:"  + someParam;
+		return "replaceMe:" + someParam;
 	}
 }
 

spring-context/src/test/java/org/springframework/cache/interceptor/ExpressionEvaluatorTests.java

@@ -121,7 +121,7 @@ public void unavailableReturnValue() {
 		EvaluationContext context = createEvaluationContext(CacheOperationExpressionEvaluator.RESULT_UNAVAILABLE);
 		assertThatExceptionOfType(VariableNotAvailableException.class).isThrownBy(() ->
 				new SpelExpressionParser().parseExpression("#result").getValue(context))
-			.satisfies(ex ->  assertThat(ex.getName()).isEqualTo("result"));
+			.satisfies(ex -> assertThat(ex.getName()).isEqualTo("result"));
 	}
 
 	@Test

spring-context/src/test/java/org/springframework/context/annotation/configuration/Spr10744Tests.java

@@ -122,7 +122,7 @@ public Foo foo() {
 	static class MyTestConfiguration extends MyConfiguration {
 
 		@Bean
-		@Scope(value = "myTestScope",  proxyMode = ScopedProxyMode.TARGET_CLASS)
+		@Scope(value = "myTestScope", proxyMode = ScopedProxyMode.TARGET_CLASS)
 		@Override
 		public Foo foo() {
 			return new Foo();

spring-context/src/test/java/org/springframework/context/annotation/spr12334/Spr12334Tests.java

@@ -69,7 +69,7 @@ static class TestImport implements ImportBeanDefinitionRegistrar {
 		private static AtomicInteger scanned = new AtomicInteger();
 
 		@Override
-		public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry)  {
+		public void registerBeanDefinitions(AnnotationMetadata metadata, BeanDefinitionRegistry registry) {
 			if (scanned.get() > 0) {
 				throw new IllegalStateException("Already scanned");
 			}

spring-context/src/test/java/org/springframework/context/annotation4/FactoryMethodComponent.java

@@ -37,7 +37,7 @@ public class FactoryMethodComponent {
 
 	private int i;
 
-	public static TestBean nullInstance()  {
+	public static TestBean nullInstance() {
 		return null;
 	}
 

spring-context/src/test/java/org/springframework/context/support/DefaultLifecycleProcessorTests.java

@@ -677,7 +677,7 @@ static TestLifecycleBean forShutdownTests(CopyOnWriteArrayList<Lifecycle> stoppe
 			return new TestLifecycleBean(null, stoppedBeans);
 		}
 
-		private TestLifecycleBean(CopyOnWriteArrayList<Lifecycle> startedBeans,  CopyOnWriteArrayList<Lifecycle> stoppedBeans) {
+		private TestLifecycleBean(CopyOnWriteArrayList<Lifecycle> startedBeans, CopyOnWriteArrayList<Lifecycle> stoppedBeans) {
 			this.startedBeans = startedBeans;
 			this.stoppedBeans = stoppedBeans;
 		}

spring-context/src/test/java/org/springframework/context/support/GenericApplicationContextTests.java

@@ -652,7 +652,7 @@ public BeanA(BeanB b, BeanC c) {
 		}
 	}
 
-	static class BeanB implements ApplicationContextAware  {
+	static class BeanB implements ApplicationContextAware {
 
 		ApplicationContext applicationContext;
 

spring-context/src/test/java/org/springframework/jmx/support/JmxUtilsTests.java

@@ -58,7 +58,7 @@ void isMBean() {
 	}
 
 	@Test
-	void isMBeanWithDynamicMBean()  {
+	void isMBeanWithDynamicMBean() {
 		DynamicMBean mbean = new TestDynamicMBean();
 		assertThat(JmxUtils.isMBean(mbean.getClass())).as("Dynamic MBean not detected correctly").isTrue();
 	}
@@ -76,24 +76,24 @@ void isMBeanWithStandardMBeanInherited() throws NotCompliantMBeanException {
 	}
 
 	@Test
-	void notAnMBean()  {
+	void notAnMBean() {
 		assertThat(JmxUtils.isMBean(Object.class)).as("Object incorrectly identified as an MBean").isFalse();
 	}
 
 	@Test
-	void simpleMBean()  {
+	void simpleMBean() {
 		Foo foo = new Foo();
 		assertThat(JmxUtils.isMBean(foo.getClass())).as("Simple MBean not detected correctly").isTrue();
 	}
 
 	@Test
-	void simpleMXBean()  {
+	void simpleMXBean() {
 		FooX foo = new FooX();
 		assertThat(JmxUtils.isMBean(foo.getClass())).as("Simple MXBean not detected correctly").isTrue();
 	}
 
 	@Test
-	void simpleMBeanThroughInheritance()  {
+	void simpleMBeanThroughInheritance() {
 		Bar bar = new Bar();
 		Abc abc = new Abc();
 		assertThat(JmxUtils.isMBean(bar.getClass())).as("Simple MBean (through inheritance) not detected correctly").isTrue();

spring-context/src/test/java/org/springframework/scheduling/support/CronExpressionTests.java

@@ -1357,7 +1357,7 @@ public void daylightSaving() {
 	@Test
 	public void various() {
 		CronExpression cronExpression = CronExpression.parse("3-57 13-28 17,18 1,15 3-12 6#1");
-		LocalDateTime last =     LocalDateTime.of(2022, 9, 15, 17, 44, 11);
+		LocalDateTime last = LocalDateTime.of(2022, 9, 15, 17, 44, 11);
 		LocalDateTime expected = LocalDateTime.of(2022, 10, 1, 17, 13, 3);
 		LocalDateTime actual = cronExpression.next(last);
 		assertThat(actual).isNotNull();

spring-context/src/testFixtures/java/org/springframework/context/testfixture/cache/AbstractValueAdaptingCacheTests.java

@@ -26,7 +26,7 @@
  * @author Stephane Nicoll
  */
 public abstract class AbstractValueAdaptingCacheTests<T extends AbstractValueAdaptingCache>
-		extends AbstractCacheTests<T>  {
+		extends AbstractCacheTests<T> {
 
 	protected static final String CACHE_NAME_NO_NULL = "testCacheNoNull";
 

spring-context/src/testFixtures/java/org/springframework/context/testfixture/cache/beans/AnnotatedClassCacheableService.java

@@ -205,7 +205,7 @@ public Object multiCache(Object arg1) {
 	}
 
 	@Override
-	@Caching(evict = { @CacheEvict("primary"), @CacheEvict(cacheNames = "secondary", key = "#a0"),  @CacheEvict(cacheNames = "primary", key = "#p0 + 'A'") })
+	@Caching(evict = { @CacheEvict("primary"), @CacheEvict(cacheNames = "secondary", key = "#a0"), @CacheEvict(cacheNames = "primary", key = "#p0 + 'A'") })
 	public Object multiEvict(Object arg1) {
 		return this.counter.getAndIncrement();
 	}

spring-core-test/src/main/java/org/springframework/aot/agent/InstrumentedBridgeMethods.java

@@ -479,7 +479,7 @@ public static ResourceBundle resourcebundlegetBundle(String baseName, Locale tar
 		return result;
 	}
 
-	public static ResourceBundle resourcebundlegetBundle( String baseName, Locale targetLocale,	ResourceBundle.Control control) {
+	public static ResourceBundle resourcebundlegetBundle(String baseName, Locale targetLocale, ResourceBundle.Control control) {
 		RecordedInvocation.Builder builder = RecordedInvocation.of(InstrumentedMethod.RESOURCEBUNDLE_GETBUNDLE).withArguments(baseName, targetLocale, control);
 		ResourceBundle result = null;
 		try {

spring-core/src/main/java/org/springframework/aot/hint/support/KotlinDetectorRuntimeHints.java

@@ -26,7 +26,7 @@
  * @author Brian Clozel
  * @since 6.1
  */
-class KotlinDetectorRuntimeHints  implements RuntimeHintsRegistrar {
+class KotlinDetectorRuntimeHints implements RuntimeHintsRegistrar {
 
 	@Override
 	public void registerHints(RuntimeHints hints, ClassLoader classLoader) {

spring-core/src/main/java/org/springframework/core/annotation/AnnotationAwareOrderComparator.java

@@ -92,7 +92,7 @@ public Integer getPriority(Object obj) {
 			return OrderUtils.getPriority(clazz);
 		}
 		Integer priority = OrderUtils.getPriority(obj.getClass());
-		if (priority == null  && obj instanceof DecoratingProxy decoratingProxy) {
+		if (priority == null && obj instanceof DecoratingProxy decoratingProxy) {
 			return getPriority(decoratingProxy.getDecoratedClass());
 		}
 		return priority;

spring-core/src/main/java/org/springframework/core/io/UrlResource.java

@@ -129,7 +129,7 @@ public UrlResource(String path) throws MalformedURLException {
 	 * @throws MalformedURLException if the given URL specification is not valid
 	 * @see java.net.URI#URI(String, String, String)
 	 */
-	public UrlResource(String protocol, String location) throws MalformedURLException  {
+	public UrlResource(String protocol, String location) throws MalformedURLException {
 		this(protocol, location, null);
 	}
 
@@ -145,7 +145,7 @@ public UrlResource(String protocol, String location) throws MalformedURLExceptio
 	 * @throws MalformedURLException if the given URL specification is not valid
 	 * @see java.net.URI#URI(String, String, String)
 	 */
-	public UrlResource(String protocol, String location, @Nullable String fragment) throws MalformedURLException  {
+	public UrlResource(String protocol, String location, @Nullable String fragment) throws MalformedURLException {
 		try {
 			this.uri = new URI(protocol, location, fragment);
 			this.url = this.uri.toURL();

spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferUtils.java

@@ -1074,7 +1074,7 @@ private void read() {
 			DataBuffer.ByteBufferIterator iterator = dataBuffer.writableByteBuffers();
 			Assert.state(iterator.hasNext(), "No ByteBuffer available");
 			ByteBuffer byteBuffer = iterator.next();
-			Attachment attachment = new Attachment(dataBuffer,  iterator);
+			Attachment attachment = new Attachment(dataBuffer, iterator);
 			this.channel.read(byteBuffer, this.position.get(), attachment, this);
 		}
 

spring-core/src/main/java/org/springframework/core/serializer/support/SerializingConverter.java

@@ -56,7 +56,7 @@ public SerializingConverter(Serializer<Object> serializer) {
 	 */
 	@Override
 	public byte[] convert(Object source) {
-		try  {
+		try {
 			return this.serializer.serializeToByteArray(source);
 		}
 		catch (Throwable ex) {

spring-core/src/main/java/org/springframework/util/xml/SimpleNamespaceContext.java

@@ -90,7 +90,7 @@ else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(namespaceUri)) {
 		}
 		else {
 			Set<String> prefixes = this.namespaceUriToPrefixes.get(namespaceUri);
-			return (prefixes != null ?  Collections.unmodifiableSet(prefixes) : Collections.emptySet());
+			return (prefixes != null ? Collections.unmodifiableSet(prefixes) : Collections.emptySet());
 		}
 	}
 

spring-core/src/test/java/org/springframework/core/BridgeMethodResolverTests.java

@@ -252,7 +252,7 @@ void spr3304() throws Exception {
 		Method bridgedMethod = MegaMessageProducerImpl.class.getDeclaredMethod("receive", MegaMessageEvent.class);
 		assertThat(bridgedMethod.isBridge()).isFalse();
 
-		Method bridgeMethod  = MegaMessageProducerImpl.class.getDeclaredMethod("receive", MegaEvent.class);
+		Method bridgeMethod = MegaMessageProducerImpl.class.getDeclaredMethod("receive", MegaEvent.class);
 		assertThat(bridgeMethod.isBridge()).isTrue();
 
 		assertThat(BridgeMethodResolver.findBridgedMethod(bridgeMethod)).isEqualTo(bridgedMethod);