Clean up warnings across code base

spring-web-reactive/src/main/java/org/springframework/web/reactive/function/BodyExtractors.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -16,7 +16,6 @@
 
 package org.springframework.web.reactive.function;
 
-import java.util.Collections;
 import java.util.List;
 import java.util.function.Function;
 import java.util.function.Supplier;

spring-web-reactive/src/main/java/org/springframework/web/reactive/resource/ContentVersionStrategy.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -20,7 +20,6 @@ import java.io.IOException;
 
 import org.springframework.core.io.Resource;
 import org.springframework.util.DigestUtils;
-import org.springframework.util.FileCopyUtils;
 
 /**
  * A {@code VersionStrategy} that calculates an Hex MD5 hashes from the content

spring-web-reactive/src/main/java/org/springframework/web/reactive/resource/ResourceTransformerChain.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -16,8 +16,6 @@
 
 package org.springframework.web.reactive.resource;
 
-import java.io.IOException;
-
 import reactor.core.publisher.Mono;
 
 import org.springframework.core.io.Resource;

spring-web-reactive/src/main/java/org/springframework/web/reactive/result/method/annotation/ModelAttributeMethodArgumentResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -26,7 +26,6 @@ import org.springframework.beans.BeanUtils;
 import org.springframework.core.MethodParameter;
 import org.springframework.core.ReactiveAdapter;
 import org.springframework.core.ReactiveAdapterRegistry;
-import org.springframework.core.ReactiveTypeDescriptor;
 import org.springframework.core.ResolvableType;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.util.Assert;

spring-web-reactive/src/main/java/org/springframework/web/reactive/result/method/annotation/RequestParamMapMethodArgumentResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -21,7 +21,6 @@ import java.util.Optional;
 
 import org.springframework.core.MethodParameter;
 import org.springframework.util.Assert;
-import org.springframework.util.LinkedMultiValueMap;
 import org.springframework.util.MultiValueMap;
 import org.springframework.util.StringUtils;
 import org.springframework.web.bind.annotation.RequestParam;

spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/WebSocketHandler.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -15,9 +15,6 @@
  */
 package org.springframework.web.reactive.socket;
 
-import java.util.Collections;
-import java.util.List;
-
 import reactor.core.publisher.Mono;
 
 /**

spring-web-reactive/src/test/java/org/springframework/web/reactive/config/ResourceHandlerRegistryTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -28,7 +28,6 @@ import reactor.test.StepVerifier;
 
 import org.springframework.cache.concurrent.ConcurrentMapCache;
 import org.springframework.context.support.GenericApplicationContext;
-import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.support.DataBufferTestUtils;
 import org.springframework.http.CacheControl;
 import org.springframework.http.HttpMethod;

spring-web-reactive/src/test/java/org/springframework/web/reactive/result/view/HttpMessageWriterViewTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2016 the original author or authors.
+ * Copyright 2002-2017 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.
@@ -29,7 +29,6 @@ import org.junit.Test;
 import reactor.test.StepVerifier;
 
 import org.springframework.core.codec.CharSequenceEncoder;
-import org.springframework.core.io.buffer.DataBuffer;
 import org.springframework.core.io.buffer.support.DataBufferTestUtils;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.MediaType;