diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/reactive/ReactiveManagementContextFactory.java b/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/reactive/ReactiveManagementContextFactory.java
index 860659cce20..2fa7986003d 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/reactive/ReactiveManagementContextFactory.java
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/reactive/ReactiveManagementContextFactory.java
@@ -17,9 +17,6 @@
 package org.springframework.boot.actuate.autoconfigure.web.reactive;
 
 import java.lang.reflect.Modifier;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
 
 import org.springframework.beans.FatalBeanException;
 import org.springframework.beans.factory.NoSuchBeanDefinitionException;
@@ -32,6 +29,7 @@ import org.springframework.boot.web.reactive.context.AnnotationConfigReactiveWeb
 import org.springframework.boot.web.reactive.server.ReactiveWebServerFactory;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.util.ObjectUtils;
 
 /**
  * A {@link ManagementContextFactory} for reactive web applications.
@@ -45,9 +43,9 @@ class ReactiveManagementContextFactory implements ManagementContextFactory {
 			ApplicationContext parent, Class<?>... configClasses) {
 		AnnotationConfigReactiveWebServerApplicationContext child = new AnnotationConfigReactiveWebServerApplicationContext();
 		child.setParent(parent);
-		List<Class<?>> combinedClasses = new ArrayList<>(Arrays.asList(configClasses));
-		combinedClasses.add(ReactiveWebServerAutoConfiguration.class);
-		child.register(combinedClasses.toArray(new Class<?>[combinedClasses.size()]));
+		Class<?>[] combinedClasses = ObjectUtils.addObjectToArray(configClasses,
+				ReactiveWebServerAutoConfiguration.class);
+		child.register(combinedClasses);
 		registerReactiveWebServerFactory(parent, child);
 		return child;
 	}
diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/web/reactive/ReactiveManagementContextFactoryTests.java b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/web/reactive/ReactiveManagementContextFactoryTests.java
index 30e6e0e0292..78623ff38e1 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/web/reactive/ReactiveManagementContextFactoryTests.java
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/web/reactive/ReactiveManagementContextFactoryTests.java
@@ -41,15 +41,18 @@ public class ReactiveManagementContextFactoryTests {
 	private AnnotationConfigReactiveWebServerApplicationContext parent = new AnnotationConfigReactiveWebServerApplicationContext();
 
 	@Test
-	public void createManagementContextShouldCreateChildContextWithConfigClasses() throws Exception {
+	public void createManagementContextShouldCreateChildContextWithConfigClasses()
+			throws Exception {
 		this.parent.register(ParentConfiguration.class);
 		this.parent.refresh();
-		AnnotationConfigReactiveWebServerApplicationContext childContext = (AnnotationConfigReactiveWebServerApplicationContext) this.factory.createManagementContext(this.parent,
-				TestConfiguration1.class, TestConfiguration2.class);
+		AnnotationConfigReactiveWebServerApplicationContext childContext = (AnnotationConfigReactiveWebServerApplicationContext) this.factory
+				.createManagementContext(this.parent, TestConfiguration1.class,
+						TestConfiguration2.class);
 		childContext.refresh();
 		assertThat(childContext.getBean(TestConfiguration1.class)).isNotNull();
 		assertThat(childContext.getBean(TestConfiguration2.class)).isNotNull();
-		assertThat(childContext.getBean(ReactiveWebServerAutoConfiguration.class)).isNotNull();
+		assertThat(childContext.getBean(ReactiveWebServerAutoConfiguration.class))
+				.isNotNull();
 	}
 
 	@Configuration
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/SpringApplicationTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/SpringApplicationTests.java
index 57c5c33c1bd..b3669488bc6 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/SpringApplicationTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/SpringApplicationTests.java
@@ -410,8 +410,8 @@ public class SpringApplicationTests {
 				ExampleReactiveWebConfig.class);
 		application.setWebApplicationType(WebApplicationType.REACTIVE);
 		this.context = application.run();
-		assertThat(this.context).isInstanceOf(
-				AnnotationConfigReactiveWebServerApplicationContext.class);
+		assertThat(this.context)
+				.isInstanceOf(AnnotationConfigReactiveWebServerApplicationContext.class);
 	}
 
 	@Test