ErrorResponse support in Spring MVC exception hierarchy

All Spring MVC exceptions from spring-web, now implement ErrorResponse
and expose HTTP error response information, including an RFC 7807 body.

See gh-27052

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2015 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -21,10 +21,13 @@ import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 
 import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ProblemDetail;
+import org.springframework.web.ErrorResponse;
 
 /**
- * By default when the DispatcherServlet can't find a handler for a request it
- * sends a 404 response. However if its property "throwExceptionIfNoHandlerFound"
+ * By default, when the DispatcherServlet can't find a handler for a request it
+ * sends a 404 response. However, if its property "throwExceptionIfNoHandlerFound"
  * is set to {@code true} this exception is raised and may be handled with
  * a configured HandlerExceptionResolver.
  *
@@ -34,7 +37,7 @@ import org.springframework.http.HttpHeaders;
  * @see DispatcherServlet#noHandlerFound(HttpServletRequest, HttpServletResponse)
  */
 @SuppressWarnings("serial")
-public class NoHandlerFoundException extends ServletException {
+public class NoHandlerFoundException extends ServletException implements ErrorResponse {
 
 	private final String httpMethod;
 
@@ -42,6 +45,8 @@ public class NoHandlerFoundException extends ServletException {
 
 	private final HttpHeaders headers;
 
+	private final ProblemDetail detail = ProblemDetail.forRawStatusCode(getRawStatusCode());
+
 
 	/**
 	 * Constructor for NoHandlerFoundException.
@@ -57,6 +62,11 @@ public class NoHandlerFoundException extends ServletException {
 	}
 
 
+	@Override
+	public int getRawStatusCode() {
+		return HttpStatus.NOT_FOUND.value();
+	}
+
 	public String getHttpMethod() {
 		return this.httpMethod;
 	}
@@ -69,4 +79,9 @@ public class NoHandlerFoundException extends ServletException {
 		return this.headers;
 	}
 
+	@Override
+	public ProblemDetail getBody() {
+		return this.detail;
+	}
+
 }

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -206,7 +206,7 @@ class DefaultServerRequest implements ServerRequest {
 				return theConverter.read(clazz, this.serverHttpRequest);
 			}
 		}
-		throw new HttpMediaTypeNotSupportedException(contentType, getSupportedMediaTypes(bodyClass));
+		throw new HttpMediaTypeNotSupportedException(contentType, getSupportedMediaTypes(bodyClass), method());
 	}
 
 	private List<MediaType> getSupportedMediaTypes(Class<?> bodyClass) {

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -313,7 +313,7 @@ class DefaultServerRequestBuilder implements ServerRequest.Builder {
 					return theConverter.read(clazz, inputMessage);
 				}
 			}
-			throw new HttpMediaTypeNotSupportedException(contentType, Collections.emptyList());
+			throw new HttpMediaTypeNotSupportedException(contentType, Collections.emptyList(), method());
 		}
 
 		@Override

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -264,7 +264,8 @@ public abstract class RequestMappingInfoHandlerMapping extends AbstractHandlerMe
 					throw new HttpMediaTypeNotSupportedException(ex.getMessage());
 				}
 			}
-			throw new HttpMediaTypeNotSupportedException(contentType, new ArrayList<>(mediaTypes));
+			throw new HttpMediaTypeNotSupportedException(
+					contentType, new ArrayList<>(mediaTypes), HttpMethod.valueOf(request.getMethod()));
 		}
 
 		if (helper.hasProducesMismatch()) {

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

@@ -206,7 +206,7 @@ public abstract class AbstractMessageConverterMethodArgumentResolver implements
 				return null;
 			}
 			throw new HttpMediaTypeNotSupportedException(contentType,
-					getSupportedMediaTypes(targetClass != null ? targetClass : Object.class));
+					getSupportedMediaTypes(targetClass != null ? targetClass : Object.class), httpMethod);
 		}
 
 		MediaType selectedContentType = contentType;