Replace lambdas with method reference or call

Closes gh-14937

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/condition/ConditionsReportEndpoint.java

@@ -123,8 +123,7 @@ public class ConditionsReportEndpoint {
 			this.negativeMatches = new LinkedHashMap<>();
 			this.exclusions = report.getExclusions();
 			this.unconditionalClasses = report.getUnconditionalClasses();
-			report.getConditionAndOutcomesBySource().forEach(
-					(source, conditionAndOutcomes) -> add(source, conditionAndOutcomes));
+			report.getConditionAndOutcomesBySource().forEach(this::add);
 			this.parentId = (context.getParent() != null) ? context.getParent().getId()
 					: null;
 		}

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/annotation/EndpointDiscoverer.java

@@ -26,6 +26,7 @@ import java.util.Map;
 import java.util.Objects;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.stream.Collectors;
 
@@ -147,7 +148,7 @@ public abstract class EndpointDiscoverer<E extends ExposableEndpoint<O>, O exten
 
 	private void addExtensionBeans(Collection<EndpointBean> endpointBeans) {
 		Map<EndpointId, EndpointBean> byId = endpointBeans.stream()
-				.collect(Collectors.toMap(EndpointBean::getId, (bean) -> bean));
+				.collect(Collectors.toMap(EndpointBean::getId, Function.identity()));
 		String[] beanNames = BeanFactoryUtils.beanNamesForAnnotationIncludingAncestors(
 				this.applicationContext, EndpointExtension.class);
 		for (String beanName : beanNames) {

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/web/PathMapper.java

@@ -49,7 +49,7 @@ public interface PathMapper {
 	 */
 	@Deprecated
 	static PathMapper useEndpointId() {
-		return (id) -> id.toString();
+		return EndpointId::toString;
 	}
 
 	/**

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cassandra/CassandraAutoConfiguration.java

@@ -80,8 +80,7 @@ public class CassandraAutoConfiguration {
 		map.from(this::getSocketOptions).to(builder::withSocketOptions);
 		map.from(properties::isSsl).whenTrue().toCall(builder::withSSL);
 		map.from(this::getPoolingOptions).to(builder::withPoolingOptions);
-		map.from(properties::getContactPoints)
-				.as((list) -> StringUtils.toStringArray(list))
+		map.from(properties::getContactPoints).as(StringUtils::toStringArray)
 				.to(builder::addContactPoints);
 		map.from(properties::isJmxEnabled).whenFalse()
 				.toCall(builder::withoutJMXReporting);