Polish: lamdbas containing only one statement should not nest this statement in a block

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

@@ -347,9 +347,7 @@ public abstract class CacheAspectSupport extends AbstractCacheInvoker
 				Object key = generateKey(context, CacheOperationExpressionEvaluator.NO_RESULT);
 				Cache cache = context.getCaches().iterator().next();
 				try {
-					return wrapCacheValue(method, cache.get(key, () -> {
-						return unwrapReturnValue(invokeOperation(invoker));
-					}));
+					return wrapCacheValue(method, cache.get(key, () -> unwrapReturnValue(invokeOperation(invoker))));
 				}
 				catch (Cache.ValueRetrievalException ex) {
 					// The invoker wraps any Throwable in a ThrowableWrapper instance so we

spring-jms/src/main/java/org/springframework/jms/core/JmsTemplate.java

@@ -653,16 +653,12 @@ public class JmsTemplate extends JmsDestinationAccessor implements JmsOperations
 
 	@Override
 	public void convertAndSend(Destination destination, final Object message) throws JmsException {
-		send(destination, session -> {
-			return getRequiredMessageConverter().toMessage(message, session);
-		});
+		send(destination, session -> getRequiredMessageConverter().toMessage(message, session));
 	}
 
 	@Override
 	public void convertAndSend(String destinationName, final Object message) throws JmsException {
-		send(destinationName, session -> {
-			return getRequiredMessageConverter().toMessage(message, session);
-		});
+		send(destinationName, session -> getRequiredMessageConverter().toMessage(message, session));
 	}
 
 	@Override
@@ -742,9 +738,7 @@ public class JmsTemplate extends JmsDestinationAccessor implements JmsOperations
 	@Override
 	@Nullable
 	public Message receiveSelected(final Destination destination, @Nullable final String messageSelector) throws JmsException {
-		return execute(session -> {
-			return doReceive(session, destination, messageSelector);
-		}, true);
+		return execute(session -> doReceive(session, destination, messageSelector), true);
 	}
 
 	@Override

spring-web/src/main/java/org/springframework/http/codec/xml/XmlEventDecoder.java

@@ -110,9 +110,7 @@ public class XmlEventDecoder extends AbstractDecoder<XMLEvent> {
 							InputStream is = dataBuffer.asInputStream();
 							Iterator eventReader = inputFactory.createXMLEventReader(is);
 							return Flux.fromIterable((Iterable<XMLEvent>) () -> eventReader)
-									.doFinally(t -> {
-										DataBufferUtils.release(dataBuffer);
-									});
+									.doFinally(t -> DataBufferUtils.release(dataBuffer));
 						}
 						catch (XMLStreamException ex) {
 							return Mono.error(ex);

spring-webflux/src/main/java/org/springframework/web/reactive/function/client/ExchangeFilterFunctions.java

@@ -91,10 +91,8 @@ public abstract class ExchangeFilterFunctions {
 				clientRequest -> credentialsFunction.apply(clientRequest).map(
 						credentials -> {
 							ClientRequest authorizedRequest = ClientRequest.from(clientRequest)
-									.headers(headers -> {
-										headers.set(HttpHeaders.AUTHORIZATION,
-												authorization(credentials));
-									})
+									.headers(headers -> headers.set(HttpHeaders.AUTHORIZATION,
+                                            authorization(credentials)))
 									.build();
 							return Mono.just(authorizedRequest);
 						})

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/support/RouterFunctionMapping.java

@@ -114,9 +114,7 @@ public class RouterFunctionMapping extends AbstractHandlerMapping implements Ini
 
 		List<RouterFunction<?>> routerFunctions = routerFunctions();
 		if (!CollectionUtils.isEmpty(routerFunctions) && logger.isInfoEnabled()) {
-			routerFunctions.forEach(routerFunction -> {
-				logger.info("Mapped " + routerFunction);
-			});
+			routerFunctions.forEach(routerFunction -> logger.info("Mapped " + routerFunction));
 		}
 		this.routerFunction = routerFunctions.stream()
 				.reduce(RouterFunction::andOther)