diff --git a/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/web/graphql/runtimewiring/GreetingController.java b/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/web/graphql/runtimewiring/GreetingController.java
index 698ab840457..0e5b61be63d 100644
--- a/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/web/graphql/runtimewiring/GreetingController.java
+++ b/spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/web/graphql/runtimewiring/GreetingController.java
@@ -1,5 +1,5 @@
/*
- * Copyright 2002-present the original author or authors.
+ * Copyright 2012-present 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/src/main/java/org/springframework/boot/context/metrics/buffering/BufferedStartupStep.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/metrics/buffering/BufferedStartupStep.java
index 4903873ef37..36748a24d7d 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/metrics/buffering/BufferedStartupStep.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/metrics/buffering/BufferedStartupStep.java
@@ -1,5 +1,5 @@
/*
- * Copyright 2002-present the original author or authors.
+ * Copyright 2012-present 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/src/main/java/org/springframework/boot/context/metrics/buffering/BufferingApplicationStartup.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/metrics/buffering/BufferingApplicationStartup.java
index 147c0322bf9..f1c522174be 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/metrics/buffering/BufferingApplicationStartup.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/metrics/buffering/BufferingApplicationStartup.java
@@ -1,5 +1,5 @@
/*
- * Copyright 2002-present the original author or authors.
+ * Copyright 2012-present 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/src/main/java/org/springframework/boot/context/metrics/buffering/StartupTimeline.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/metrics/buffering/StartupTimeline.java
index de36a6312eb..20f67bcf41b 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/metrics/buffering/StartupTimeline.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/metrics/buffering/StartupTimeline.java
@@ -1,5 +1,5 @@
/*
- * Copyright 2002-present the original author or authors.
+ * Copyright 2012-present 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/src/main/java/org/springframework/boot/context/properties/ConstructorBound.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConstructorBound.java
index 2ba6f21d75b..36c2063ea52 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConstructorBound.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/properties/ConstructorBound.java
@@ -1,5 +1,5 @@
/*
- * Copyright 2019-present the original author or authors.
+ * Copyright 2012-present 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/src/main/java/org/springframework/boot/convert/PeriodStyle.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/PeriodStyle.java
index 30392a9220f..c97f038f5e2 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/PeriodStyle.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/PeriodStyle.java
@@ -1,5 +1,5 @@
/*
- * Copyright 2002-present the original author or authors.
+ * Copyright 2012-present 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/src/main/java/org/springframework/boot/convert/PeriodToStringConverter.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/PeriodToStringConverter.java
index b285d6911d6..dd8eac02122 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/PeriodToStringConverter.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/convert/PeriodToStringConverter.java
@@ -1,5 +1,5 @@
/*
- * Copyright 2002-present the original author or authors.
+ * Copyright 2012-present 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/src/checkstyle/checkstyle.xml b/src/checkstyle/checkstyle.xml
index 3142d702fa6..ae5dea7a02c 100644
--- a/src/checkstyle/checkstyle.xml
+++ b/src/checkstyle/checkstyle.xml
@@ -7,6 +7,9 @@
+
+
+