Polish contribution

See gh-30587

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestResponseBodyMethodProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -21,8 +21,6 @@ import java.lang.reflect.Type;
 import java.net.URI;
 import java.util.List;
 
-import jakarta.servlet.http.HttpServletRequest;
-
 import org.springframework.core.Conventions;
 import org.springframework.core.MethodParameter;
 import org.springframework.core.annotation.AnnotatedElementUtils;
@@ -34,7 +32,6 @@ import org.springframework.http.converter.HttpMessageNotWritableException;
 import org.springframework.http.server.ServletServerHttpRequest;
 import org.springframework.http.server.ServletServerHttpResponse;
 import org.springframework.lang.Nullable;
-import org.springframework.util.Assert;
 import org.springframework.validation.BindingResult;
 import org.springframework.web.HttpMediaTypeNotAcceptableException;
 import org.springframework.web.HttpMediaTypeNotSupportedException;
@@ -157,7 +154,6 @@ public class RequestResponseBodyMethodProcessor extends AbstractMessageConverter
 			Type paramType) throws IOException, HttpMediaTypeNotSupportedException, HttpMessageNotReadableException {
 
 		ServletServerHttpRequest inputMessage = createInputMessage(webRequest);
-
 		Object arg = readWithMessageConverters(inputMessage, parameter, paramType);
 		if (arg == null && checkRequired(parameter)) {
 			throw new HttpMessageNotReadableException("Required request body is missing: " +