Nullability refinements

spring-context/src/main/java/org/springframework/validation/support/BindingAwareConcurrentModel.java

 /*
- * 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.
@@ -18,6 +18,7 @@ package org.springframework.validation.support;
 
 import java.util.Map;
 
+import org.springframework.lang.Nullable;
 import org.springframework.ui.ConcurrentModel;
 import org.springframework.validation.BindingResult;
 
@@ -36,17 +37,19 @@ import org.springframework.validation.BindingResult;
  * @author Rossen Stoyanchev
  * @since 5.0
  * @see BindingResult
+ * @see BindingAwareModelMap
  */
 @SuppressWarnings("serial")
 public class BindingAwareConcurrentModel extends ConcurrentModel {
 
 	@Override
-	public Object put(String key, Object value) {
+	@Nullable
+	public Object put(String key, @Nullable Object value) {
 		removeBindingResultIfNecessary(key, value);
 		return super.put(key, value);
 	}
 
-	private void removeBindingResultIfNecessary(String key, Object value) {
+	private void removeBindingResultIfNecessary(String key, @Nullable Object value) {
 		if (!key.startsWith(BindingResult.MODEL_KEY_PREFIX)) {
 			String resultKey = BindingResult.MODEL_KEY_PREFIX + key;
 			BindingResult result = (BindingResult) get(resultKey);

spring-context/src/main/java/org/springframework/validation/support/BindingAwareModelMap.java

 /*
- * Copyright 2002-2017 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.
@@ -18,6 +18,7 @@ package org.springframework.validation.support;
 
 import java.util.Map;
 
+import org.springframework.lang.Nullable;
 import org.springframework.ui.ExtendedModelMap;
 import org.springframework.validation.BindingResult;
 
@@ -39,7 +40,7 @@ import org.springframework.validation.BindingResult;
 public class BindingAwareModelMap extends ExtendedModelMap {
 
 	@Override
-	public Object put(String key, Object value) {
+	public Object put(String key, @Nullable Object value) {
 		removeBindingResultIfNecessary(key, value);
 		return super.put(key, value);
 	}
@@ -50,7 +51,7 @@ public class BindingAwareModelMap extends ExtendedModelMap {
 		super.putAll(map);
 	}
 
-	private void removeBindingResultIfNecessary(Object key, Object value) {
+	private void removeBindingResultIfNecessary(Object key, @Nullable Object value) {
 		if (key instanceof String) {
 			String attributeName = (String) key;
 			if (!attributeName.startsWith(BindingResult.MODEL_KEY_PREFIX)) {

spring-webmvc/src/main/java/org/springframework/web/servlet/function/support/RouterFunctionMapping.java

@@ -73,7 +73,6 @@ public class RouterFunctionMapping extends AbstractHandlerMapping implements Ini
 	private boolean detectHandlerFunctionsInAncestorContexts = false;
 
 
-
 	/**
 	 * Create an empty {@code RouterFunctionMapping}.
 	 * <p>If this constructor is used, this mapping will detect all
@@ -91,6 +90,7 @@ public class RouterFunctionMapping extends AbstractHandlerMapping implements Ini
 		this.routerFunction = routerFunction;
 	}
 
+
 	/**
 	 * Set the router function to map to.
 	 * <p>If this property is used, no application context detection will occur.
@@ -111,6 +111,10 @@ public class RouterFunctionMapping extends AbstractHandlerMapping implements Ini
 		return this.routerFunction;
 	}
 
+	/**
+	 * Set the message body converters to use.
+	 * <p>These converters are used to convert from and to HTTP requests and responses.
+	 */
 	public void setMessageConverters(List<HttpMessageConverter<?>> messageConverters) {
 		this.messageConverters = messageConverters;
 	}
@@ -127,6 +131,7 @@ public class RouterFunctionMapping extends AbstractHandlerMapping implements Ini
 		this.detectHandlerFunctionsInAncestorContexts = detectHandlerFunctionsInAncestorContexts;
 	}
 
+
 	@Override
 	public void afterPropertiesSet() throws Exception {
 		if (this.routerFunction == null) {
@@ -204,8 +209,9 @@ public class RouterFunctionMapping extends AbstractHandlerMapping implements Ini
 		this.messageConverters = messageConverters;
 	}
 
-	@Nullable
+
 	@Override
+	@Nullable
 	protected Object getHandlerInternal(HttpServletRequest servletRequest) throws Exception {
 		if (this.routerFunction != null) {
 			ServerRequest request = ServerRequest.create(servletRequest, this.messageConverters);
@@ -219,8 +225,10 @@ public class RouterFunctionMapping extends AbstractHandlerMapping implements Ini
 	}
 
 	private void setAttributes(HttpServletRequest servletRequest, ServerRequest request,
-			HandlerFunction<?> handlerFunction) {
-		PathPattern matchingPattern = (PathPattern) servletRequest.getAttribute(RouterFunctions.MATCHING_PATTERN_ATTRIBUTE);
+			@Nullable HandlerFunction<?> handlerFunction) {
+
+		PathPattern matchingPattern =
+				(PathPattern) servletRequest.getAttribute(RouterFunctions.MATCHING_PATTERN_ATTRIBUTE);
 		if (matchingPattern != null) {
 			servletRequest.removeAttribute(RouterFunctions.MATCHING_PATTERN_ATTRIBUTE);
 			servletRequest.setAttribute(BEST_MATCHING_PATTERN_ATTRIBUTE, matchingPattern.getPatternString());

spring-webmvc/src/main/java/org/springframework/web/servlet/handler/AbstractHandlerMethodMapping.java

@@ -369,6 +369,7 @@ public abstract class AbstractHandlerMethodMapping<T> extends AbstractHandlerMap
 	 * Look up a handler method for the given request.
 	 */
 	@Override
+	@Nullable
 	protected HandlerMethod getHandlerInternal(HttpServletRequest request) throws Exception {
 		String lookupPath = initLookupPath(request);
 		this.mappingRegistry.acquireReadLock();

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

@@ -34,6 +34,7 @@ import org.springframework.http.HttpMethod;
 import org.springframework.http.InvalidMediaTypeException;
 import org.springframework.http.MediaType;
 import org.springframework.http.server.PathContainer;
+import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 import org.springframework.util.MultiValueMap;
@@ -117,6 +118,7 @@ public abstract class RequestMappingInfoHandlerMapping extends AbstractHandlerMe
 	}
 
 	@Override
+	@Nullable
 	protected HandlerMethod getHandlerInternal(HttpServletRequest request) throws Exception {
 		request.removeAttribute(PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE);
 		try {

spring-websocket/src/main/java/org/springframework/web/socket/server/support/WebSocketHandlerMapping.java

@@ -97,11 +97,12 @@ public class WebSocketHandlerMapping extends SimpleUrlHandlerMapping implements
 		return this.running;
 	}
 
-	@Nullable
+
 	@Override
+	@Nullable
 	protected Object getHandlerInternal(HttpServletRequest request) throws Exception {
 		Object handler = super.getHandlerInternal(request);
-		return matchWebSocketUpgrade(handler, request) ? handler : null;
+		return (matchWebSocketUpgrade(handler, request) ? handler : null);
 	}
 
 	private boolean matchWebSocketUpgrade(@Nullable Object handler, HttpServletRequest request) {