Improve exception message if endpoint can't be found

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/jersey/JerseyWebEndpointManagementContextConfiguration.java

@@ -103,7 +103,8 @@ class JerseyWebEndpointManagementContextConfiguration {
 		ExposableWebEndpoint health = webEndpoints.stream()
 			.filter((endpoint) -> endpoint.getEndpointId().equals(HEALTH_ENDPOINT_ID))
 			.findFirst()
-			.get();
+			.orElseThrow(
+					() -> new IllegalStateException("No endpoint with id '%s' found".formatted(HEALTH_ENDPOINT_ID)));
 		return new JerseyAdditionalHealthEndpointPathsManagementResourcesRegistrar(health, healthEndpointGroups);
 	}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/reactive/WebFluxEndpointManagementContextConfiguration.java

@@ -120,7 +120,8 @@ public class WebFluxEndpointManagementContextConfiguration {
 		ExposableWebEndpoint health = webEndpoints.stream()
 			.filter((endpoint) -> endpoint.getEndpointId().equals(HealthEndpoint.ID))
 			.findFirst()
-			.get();
+			.orElseThrow(
+					() -> new IllegalStateException("No endpoint with id '%s' found".formatted(HealthEndpoint.ID)));
 		return new AdditionalHealthEndpointPathsWebFluxHandlerMapping(new EndpointMapping(""), health,
 				groups.getAllWithAdditionalPath(WebServerNamespace.MANAGEMENT));
 	}
@@ -162,16 +163,16 @@ public class WebFluxEndpointManagementContextConfiguration {
 
 		@Override
 		public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
-			if (bean instanceof ServerCodecConfigurer) {
-				process((ServerCodecConfigurer) bean);
+			if (bean instanceof ServerCodecConfigurer serverCodecConfigurer) {
+				process(serverCodecConfigurer);
 			}
 			return bean;
 		}
 
 		private void process(ServerCodecConfigurer configurer) {
 			for (HttpMessageWriter<?> writer : configurer.getWriters()) {
-				if (writer instanceof EncoderHttpMessageWriter) {
-					process(((EncoderHttpMessageWriter<?>) writer).getEncoder());
+				if (writer instanceof EncoderHttpMessageWriter<?> encoderHttpMessageWriter) {
+					process((encoderHttpMessageWriter).getEncoder());
 				}
 			}
 		}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/endpoint/web/servlet/WebMvcEndpointManagementContextConfiguration.java

@@ -115,7 +115,8 @@ public class WebMvcEndpointManagementContextConfiguration {
 		ExposableWebEndpoint health = webEndpoints.stream()
 			.filter((endpoint) -> endpoint.getEndpointId().equals(HealthEndpoint.ID))
 			.findFirst()
-			.get();
+			.orElseThrow(
+					() -> new IllegalStateException("No endpoint with id '%s' found".formatted(HealthEndpoint.ID)));
 		return new AdditionalHealthEndpointPathsWebMvcHandlerMapping(health,
 				groups.getAllWithAdditionalPath(WebServerNamespace.MANAGEMENT));
 	}
@@ -157,8 +158,8 @@ public class WebMvcEndpointManagementContextConfiguration {
 		@Override
 		public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
 			for (HttpMessageConverter<?> converter : converters) {
-				if (converter instanceof MappingJackson2HttpMessageConverter) {
-					configure((MappingJackson2HttpMessageConverter) converter);
+				if (converter instanceof MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter) {
+					configure(mappingJackson2HttpMessageConverter);
 				}
 			}
 		}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/health/HealthEndpointReactiveWebExtensionConfiguration.java

@@ -70,7 +70,8 @@ class HealthEndpointReactiveWebExtensionConfiguration {
 			ExposableWebEndpoint health = webEndpoints.stream()
 				.filter((endpoint) -> endpoint.getEndpointId().equals(HealthEndpoint.ID))
 				.findFirst()
-				.get();
+				.orElseThrow(
+						() -> new IllegalStateException("No endpoint with id '%s' found".formatted(HealthEndpoint.ID)));
 			return new AdditionalHealthEndpointPathsWebFluxHandlerMapping(new EndpointMapping(""), health,
 					groups.getAllWithAdditionalPath(WebServerNamespace.SERVER));
 		}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/health/HealthEndpointWebExtensionConfiguration.java

@@ -81,7 +81,8 @@ class HealthEndpointWebExtensionConfiguration {
 		return webEndpoints.stream()
 			.filter((endpoint) -> endpoint.getEndpointId().equals(HealthEndpoint.ID))
 			.findFirst()
-			.get();
+			.orElseThrow(
+					() -> new IllegalStateException("No endpoint with id '%s' found".formatted(HealthEndpoint.ID)));
 	}
 
 	@ConditionalOnBean(DispatcherServlet.class)