diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/CompositeMeterRegistryConfiguration.java b/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/CompositeMeterRegistryConfiguration.java
index c10d413559..6a8c773572 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/CompositeMeterRegistryConfiguration.java
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/CompositeMeterRegistryConfiguration.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,6 +28,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnSingleCandi
 import org.springframework.boot.autoconfigure.condition.NoneNestedConditions;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Conditional;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Primary;
 
 /**
@@ -35,6 +36,7 @@ import org.springframework.context.annotation.Primary;
  *
  * @author Andy Wilkinson
  */
+@Configuration
 @Conditional(MultipleNonPrimaryMeterRegistriesCondition.class)
 class CompositeMeterRegistryConfiguration {
 
diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/jersey/JerseyManagementContextConfiguration.java b/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/jersey/JerseyManagementContextConfiguration.java
index 28668ad208..d5e0818872 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/jersey/JerseyManagementContextConfiguration.java
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/web/jersey/JerseyManagementContextConfiguration.java
@@ -23,12 +23,14 @@ import org.springframework.boot.autoconfigure.jersey.ResourceConfigCustomizer;
 import org.springframework.boot.autoconfigure.web.servlet.JerseyApplicationPath;
 import org.springframework.boot.web.servlet.ServletRegistrationBean;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 
 /**
  * Shared configuration for Jersey-based actuators regardless of management context type.
  *
  * @author Madhura Bhave
  */
+@Configuration
 class JerseyManagementContextConfiguration {
 
 	@Bean
diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/jersey/JerseyServerMetricsAutoConfigurationTests.java b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/jersey/JerseyServerMetricsAutoConfigurationTests.java
index 8fdc463200..07395b5edc 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/jersey/JerseyServerMetricsAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/jersey/JerseyServerMetricsAutoConfigurationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -45,6 +45,7 @@ import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
 import org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.web.client.RestTemplate;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -127,6 +128,7 @@ public class JerseyServerMetricsAutoConfigurationTests {
 				String.class);
 	}
 
+	@Configuration
 	static class ResourceConfiguration {
 
 		@Bean
@@ -147,6 +149,7 @@ public class JerseyServerMetricsAutoConfigurationTests {
 
 	}
 
+	@Configuration
 	static class CustomJerseyTagsProviderConfiguration {
 
 		@Bean
diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/scheduling/ScheduledTasksEndpointAutoConfigurationTests.java b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/scheduling/ScheduledTasksEndpointAutoConfigurationTests.java
index af55ebebfa..992c536eb7 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/scheduling/ScheduledTasksEndpointAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/scheduling/ScheduledTasksEndpointAutoConfigurationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,6 +24,7 @@ import org.springframework.boot.actuate.scheduling.ScheduledTasksEndpoint;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -60,6 +61,7 @@ public class ScheduledTasksEndpointAutoConfigurationTests {
 						.hasBean("customEndpoint"));
 	}
 
+	@Configuration
 	private static class CustomEndpointConfiguration {
 
 		@Bean
diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/security/servlet/AbstractEndpointRequestIntegrationTests.java b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/security/servlet/AbstractEndpointRequestIntegrationTests.java
index 812b7cf19b..dfcc805093 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/security/servlet/AbstractEndpointRequestIntegrationTests.java
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/security/servlet/AbstractEndpointRequestIntegrationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -96,6 +96,7 @@ public abstract class AbstractEndpointRequestIntegrationTests {
 		return "Basic " + Base64.getEncoder().encodeToString("user:password".getBytes());
 	}
 
+	@Configuration
 	static class BaseConfiguration {
 
 		@Bean
diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/web/servlet/WebMvcEndpointChildContextConfigurationTests.java b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/web/servlet/WebMvcEndpointChildContextConfigurationTests.java
index 20ebfcdebd..1b8a155a5d 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/web/servlet/WebMvcEndpointChildContextConfigurationTests.java
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/web/servlet/WebMvcEndpointChildContextConfigurationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,6 +22,7 @@ import org.springframework.boot.autoconfigure.web.servlet.DispatcherServletPath;
 import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
 import org.springframework.boot.web.servlet.filter.OrderedRequestContextFilter;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.web.context.request.RequestContextListener;
 import org.springframework.web.filter.RequestContextFilter;
 
@@ -72,6 +73,7 @@ public class WebMvcEndpointChildContextConfigurationTests {
 								.isEqualTo("/"));
 	}
 
+	@Configuration
 	static class ExistingConfig {
 
 		@Bean
@@ -81,6 +83,7 @@ public class WebMvcEndpointChildContextConfigurationTests {
 
 	}
 
+	@Configuration
 	static class RequestContextListenerConfig {
 
 		@Bean
diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/WebMvcMetricsIntegrationTests.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/WebMvcMetricsIntegrationTests.java
index 7777bead33..383a5cd677 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/WebMvcMetricsIntegrationTests.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/WebMvcMetricsIntegrationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -114,6 +114,7 @@ public class WebMvcMetricsIntegrationTests {
 					"http.server.requests", true);
 		}
 
+		@Configuration
 		@RestController
 		@RequestMapping("/api")
 		@Timed
diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/scheduling/ScheduledTasksEndpointTests.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/scheduling/ScheduledTasksEndpointTests.java
index c4940a7831..3261d7d4ef 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/scheduling/ScheduledTasksEndpointTests.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/scheduling/ScheduledTasksEndpointTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,6 +30,7 @@ import org.springframework.boot.actuate.scheduling.ScheduledTasksEndpoint.FixedR
 import org.springframework.boot.actuate.scheduling.ScheduledTasksEndpoint.ScheduledTasksReport;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.scheduling.Trigger;
 import org.springframework.scheduling.annotation.EnableScheduling;
 import org.springframework.scheduling.annotation.Scheduled;
@@ -166,6 +167,7 @@ public class ScheduledTasksEndpointTests {
 				.accept(context.getBean(ScheduledTasksEndpoint.class).scheduledTasks()));
 	}
 
+	@Configuration
 	@EnableScheduling
 	private static class BaseConfiguration {
 
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration.java
index 6f9c4ddd72..63d25d933c 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -26,6 +26,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.jdbc.DatabaseDriver;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.util.StringUtils;
 
 /**
@@ -46,6 +47,7 @@ abstract class DataSourceConfiguration {
 	/**
 	 * Tomcat Pool DataSource configuration.
 	 */
+	@Configuration
 	@ConditionalOnClass(org.apache.tomcat.jdbc.pool.DataSource.class)
 	@ConditionalOnMissingBean(DataSource.class)
 	@ConditionalOnProperty(name = "spring.datasource.type", havingValue = "org.apache.tomcat.jdbc.pool.DataSource", matchIfMissing = true)
@@ -72,6 +74,7 @@ abstract class DataSourceConfiguration {
 	/**
 	 * Hikari DataSource configuration.
 	 */
+	@Configuration
 	@ConditionalOnClass(HikariDataSource.class)
 	@ConditionalOnMissingBean(DataSource.class)
 	@ConditionalOnProperty(name = "spring.datasource.type", havingValue = "com.zaxxer.hikari.HikariDataSource", matchIfMissing = true)
@@ -93,6 +96,7 @@ abstract class DataSourceConfiguration {
 	/**
 	 * DBCP DataSource configuration.
 	 */
+	@Configuration
 	@ConditionalOnClass(org.apache.commons.dbcp2.BasicDataSource.class)
 	@ConditionalOnMissingBean(DataSource.class)
 	@ConditionalOnProperty(name = "spring.datasource.type", havingValue = "org.apache.commons.dbcp2.BasicDataSource", matchIfMissing = true)
@@ -111,6 +115,7 @@ abstract class DataSourceConfiguration {
 	/**
 	 * Generic DataSource configuration.
 	 */
+	@Configuration
 	@ConditionalOnMissingBean(DataSource.class)
 	@ConditionalOnProperty(name = "spring.datasource.type")
 	static class Generic {
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/ReactiveWebServerFactoryConfiguration.java b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/ReactiveWebServerFactoryConfiguration.java
index 9ed9c3c6dd..6a605ed5c8 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/ReactiveWebServerFactoryConfiguration.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/reactive/ReactiveWebServerFactoryConfiguration.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -95,6 +95,7 @@ abstract class ReactiveWebServerFactoryConfiguration {
 
 	}
 
+	@Configuration
 	@ConditionalOnMissingBean(ReactiveWebServerFactory.class)
 	@ConditionalOnClass({ Undertow.class })
 	static class EmbeddedUndertow {
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/batch/BatchAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/batch/BatchAutoConfigurationTests.java
index 76f0900fcc..b1a5fa901c 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/batch/BatchAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/batch/BatchAutoConfigurationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -307,6 +307,7 @@ public class BatchAutoConfigurationTests {
 
 	}
 
+	@Configuration
 	@EnableBatchProcessing
 	protected static class NamedJobConfigurationWithRegisteredJob {
 
@@ -348,6 +349,7 @@ public class BatchAutoConfigurationTests {
 
 	}
 
+	@Configuration
 	@EnableBatchProcessing
 	protected static class NamedJobConfigurationWithLocalJob {
 
@@ -379,6 +381,7 @@ public class BatchAutoConfigurationTests {
 
 	}
 
+	@Configuration
 	@EnableBatchProcessing
 	protected static class JobConfiguration {
 
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/JndiDataSourceAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/JndiDataSourceAutoConfigurationTests.java
index e491a21b0b..547e8f9a00 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/JndiDataSourceAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/JndiDataSourceAutoConfigurationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,6 +32,7 @@ import org.springframework.boot.autoconfigure.jndi.TestableInitialContextFactory
 import org.springframework.boot.test.util.TestPropertyValues;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.jmx.export.MBeanExporter;
 import org.springframework.test.util.ReflectionTestUtils;
 
@@ -161,7 +162,8 @@ public class JndiDataSourceAutoConfigurationTests {
 		TestableInitialContextFactory.bind(name, dataSource);
 	}
 
-	private static class MBeanExporterConfiguration {
+	@Configuration
+	static class MBeanExporterConfiguration {
 
 		@Bean
 		MBeanExporter mbeanExporter() {
@@ -170,7 +172,8 @@ public class JndiDataSourceAutoConfigurationTests {
 
 	}
 
-	private static class AnotherMBeanExporterConfiguration {
+	@Configuration
+	static class AnotherMBeanExporterConfiguration {
 
 		@Bean
 		MBeanExporter anotherMbeanExporter() {
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfigurationIntegrationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfigurationIntegrationTests.java
index 54841becdd..35eeab6e48 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfigurationIntegrationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfigurationIntegrationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java
index 7823151052..d06994d454 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/MongoAutoConfigurationTests.java
@@ -111,6 +111,7 @@ public class MongoAutoConfigurationTests {
 
 	}
 
+	@Configuration
 	static class FallbackMongoClientConfig {
 
 		@Bean
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/MultipartAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/MultipartAutoConfigurationTests.java
index d6e15333fc..a23ca55c54 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/MultipartAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/MultipartAutoConfigurationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -382,6 +382,7 @@ public class MultipartAutoConfigurationTests {
 
 	}
 
+	@Configuration
 	public static class WebServerWithCustomMultipartResolver {
 
 		@Bean
@@ -391,6 +392,7 @@ public class MultipartAutoConfigurationTests {
 
 	}
 
+	@Configuration
 	public static class ContainerWithCommonsMultipartResolver {
 
 		@Bean
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/websocket/servlet/WebSocketServletAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/websocket/servlet/WebSocketServletAutoConfigurationTests.java
index ce30dcff1e..10bbc44c2d 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/websocket/servlet/WebSocketServletAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/websocket/servlet/WebSocketServletAutoConfigurationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -75,6 +75,7 @@ public class WebSocketServletAutoConfigurationTests {
 
 	}
 
+	@Configuration
 	static class CommonConfiguration {
 
 		@Bean
diff --git a/spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/integrationtest/HttpTunnelIntegrationTests.java b/spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/integrationtest/HttpTunnelIntegrationTests.java
index 335bbdd46a..3444f0ca33 100644
--- a/spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/integrationtest/HttpTunnelIntegrationTests.java
+++ b/spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/integrationtest/HttpTunnelIntegrationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -128,6 +128,7 @@ public class HttpTunnelIntegrationTests {
 
 	}
 
+	@Configuration
 	static class TunnelConfiguration {
 
 		@Bean
diff --git a/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/cloudfoundry/CloudFoundryCustomContextPathExample.java b/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/cloudfoundry/CloudFoundryCustomContextPathExample.java
index 2672a0b5b6..10b99fe4ed 100644
--- a/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/cloudfoundry/CloudFoundryCustomContextPathExample.java
+++ b/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/cloudfoundry/CloudFoundryCustomContextPathExample.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,12 +34,14 @@ import org.apache.catalina.startup.Tomcat;
 import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
 import org.springframework.boot.web.servlet.ServletContextInitializer;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 
 /**
  * Example configuration for custom context path in Cloud Foundry.
  *
  * @author Johnny Lim
  */
+@Configuration
 public class CloudFoundryCustomContextPathExample {
 
 	// tag::configuration[]
diff --git a/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/web/security/CustomWebFluxSecurityExample.java b/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/web/security/CustomWebFluxSecurityExample.java
index 7ee3ac5ee0..9c5c9360da 100644
--- a/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/web/security/CustomWebFluxSecurityExample.java
+++ b/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/web/security/CustomWebFluxSecurityExample.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,6 +18,7 @@ package org.springframework.boot.docs.web.security;
 
 import org.springframework.boot.autoconfigure.security.reactive.PathRequest;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.security.config.web.server.ServerHttpSecurity;
 import org.springframework.security.web.server.SecurityWebFilterChain;
 
@@ -26,6 +27,7 @@ import org.springframework.security.web.server.SecurityWebFilterChain;
  *
  * @author Madhura Bhave
  */
+@Configuration
 public class CustomWebFluxSecurityExample {
 
 	// @formatter:off
diff --git a/spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/servlet/SpringBootMockMvcBuilderCustomizerTests.java b/spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/servlet/SpringBootMockMvcBuilderCustomizerTests.java
index 2946d513d5..7fb6b8504e 100644
--- a/spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/servlet/SpringBootMockMvcBuilderCustomizerTests.java
+++ b/spring-boot-project/spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/servlet/SpringBootMockMvcBuilderCustomizerTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -28,6 +28,7 @@ import org.junit.Test;
 
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.mock.web.MockServletContext;
 import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.test.web.servlet.setup.DefaultMockMvcBuilder;
@@ -65,6 +66,7 @@ public class SpringBootMockMvcBuilderCustomizerTests {
 		assertThat(filters).containsExactlyInAnyOrder(testFilter, otherTestFilter);
 	}
 
+	@Configuration
 	static class ServletConfiguration {
 
 		@Bean
@@ -74,6 +76,7 @@ public class SpringBootMockMvcBuilderCustomizerTests {
 
 	}
 
+	@Configuration
 	static class FilterConfiguration {
 
 		@Bean
diff --git a/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/ImportsContextCustomizerFactoryTests.java b/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/ImportsContextCustomizerFactoryTests.java
index ac9ab7eea1..a792b7fcef 100644
--- a/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/ImportsContextCustomizerFactoryTests.java
+++ b/spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/ImportsContextCustomizerFactoryTests.java
@@ -23,6 +23,7 @@ import org.junit.Test;
 
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.context.annotation.Import;
 import org.springframework.stereotype.Component;
 import org.springframework.test.context.ContextCustomizer;
@@ -130,6 +131,7 @@ public class ImportsContextCustomizerFactoryTests {
 
 	}
 
+	@Configuration
 	@Import(ImportedBean.class)
 	static class TestWithImportAndBeanMethod {
 
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/BeanCurrentlyInCreationFailureAnalyzerTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/BeanCurrentlyInCreationFailureAnalyzerTests.java
index 812f6d1c41..2cabd980d2 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/BeanCurrentlyInCreationFailureAnalyzerTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/BeanCurrentlyInCreationFailureAnalyzerTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -226,6 +226,7 @@ public class BeanCurrentlyInCreationFailureAnalyzerTests {
 			return new BeanOne();
 		}
 
+		@org.springframework.context.annotation.Configuration
 		public static class BeanTwoConfiguration {
 
 			@SuppressWarnings("unused")
@@ -239,6 +240,7 @@ public class BeanCurrentlyInCreationFailureAnalyzerTests {
 
 		}
 
+		@org.springframework.context.annotation.Configuration
 		public static class BeanThreeConfiguration {
 
 			@Bean
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/InvalidConfigurationPropertyNameFailureAnalyzerTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/InvalidConfigurationPropertyNameFailureAnalyzerTests.java
index 616337ee44..a535027042 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/InvalidConfigurationPropertyNameFailureAnalyzerTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/InvalidConfigurationPropertyNameFailureAnalyzerTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,6 +24,7 @@ import org.springframework.boot.context.properties.EnableConfigurationProperties
 import org.springframework.boot.diagnostics.FailureAnalysis;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -60,6 +61,7 @@ public class InvalidConfigurationPropertyNameFailureAnalyzerTests {
 		}
 	}
 
+	@Configuration
 	@EnableConfigurationProperties(InvalidPrefixProperties.class)
 	static class InvalidPrefixConfiguration {
 
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/NoUniqueBeanDefinitionFailureAnalyzerTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/NoUniqueBeanDefinitionFailureAnalyzerTests.java
index 7c79be2925..ac509d9a43 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/NoUniqueBeanDefinitionFailureAnalyzerTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/diagnostics/analyzer/NoUniqueBeanDefinitionFailureAnalyzerTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -153,6 +153,7 @@ public class NoUniqueBeanDefinitionFailureAnalyzerTests {
 
 	}
 
+	@Configuration
 	static class ParentProducer {
 
 		@Bean
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/ServletContextInitializerBeansTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/ServletContextInitializerBeansTests.java
index fd316220e0..476500f9bf 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/ServletContextInitializerBeansTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/ServletContextInitializerBeansTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,6 +30,7 @@ import org.junit.Test;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -74,6 +75,7 @@ public class ServletContextInitializerBeansTests {
 		this.context = new AnnotationConfigApplicationContext(configuration);
 	}
 
+	@Configuration
 	static class ServletConfiguration {
 
 		@Bean
@@ -83,6 +85,7 @@ public class ServletContextInitializerBeansTests {
 
 	}
 
+	@Configuration
 	static class FilterConfiguration {
 
 		@Bean
@@ -92,6 +95,7 @@ public class ServletContextInitializerBeansTests {
 
 	}
 
+	@Configuration
 	static class TestConfiguration {
 
 		@Bean
diff --git a/spring-boot-samples/spring-boot-sample-parent-context/src/main/java/sample/parent/SampleParentContextApplication.java b/spring-boot-samples/spring-boot-sample-parent-context/src/main/java/sample/parent/SampleParentContextApplication.java
index 2b0f879a49..258778ad05 100644
--- a/spring-boot-samples/spring-boot-sample-parent-context/src/main/java/sample/parent/SampleParentContextApplication.java
+++ b/spring-boot-samples/spring-boot-sample-parent-context/src/main/java/sample/parent/SampleParentContextApplication.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,6 +24,7 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.integration.channel.DirectChannel;
 import org.springframework.integration.dsl.IntegrationFlow;
 import org.springframework.integration.dsl.IntegrationFlows;
@@ -41,6 +42,7 @@ public class SampleParentContextApplication {
 				.child(SampleParentContextApplication.class).run(args);
 	}
 
+	@Configuration
 	@EnableAutoConfiguration
 	protected static class Parent {