Polish contribution

See gh-27544

spring-core/src/main/java/org/springframework/core/io/ByteArrayResource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2021 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.
@@ -126,7 +126,7 @@ public class ByteArrayResource extends AbstractResource {
 	 */
 	@Override
 	public int hashCode() {
-		return Arrays.hashCode(byteArray);
+		return Arrays.hashCode(this.byteArray);
 	}
 
 }