Polishing contribution

Closes gh-29868

spring-web/src/main/java/org/springframework/http/ProblemDetail.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 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.
@@ -206,7 +206,8 @@ public class ProblemDetail {
 	 * are rendered as top level key-value pairs in the output JSON. Otherwise,
 	 * they are rendered as a {@code "properties"} sub-map.
 	 * @param name the property name
-	 * @param value the property value
+	 * @param value the property value, possibly {@code null} if the intent is
+	 * to include a property with its value set to "null"
 	 * @see org.springframework.http.converter.json.ProblemDetailJacksonMixin
 	 */
 	public void setProperty(String name, @Nullable Object value) {

spring-web/src/main/java/org/springframework/http/converter/json/ProblemDetailJacksonMixin.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 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.

spring-web/src/main/java/org/springframework/web/DefaultErrorResponseBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 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.
@@ -122,7 +122,7 @@ final class DefaultErrorResponseBuilder implements ErrorResponse.Builder {
 	}
 
 	@Override
-	public ErrorResponse.Builder property(String name, Object value) {
+	public ErrorResponse.Builder property(String name, @Nullable Object value) {
 		this.problemDetail.setProperty(name, value);
 		return this;
 	}

spring-web/src/main/java/org/springframework/web/ErrorResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 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.
@@ -265,7 +265,7 @@ public interface ErrorResponse {
 		 * property} on the underlying {@code ProblemDetail}.
 		 * @return the same builder instance
 		 */
-		Builder property(String name, Object value);
+		Builder property(String name, @Nullable Object value);
 
 		/**
 		 * Build the {@code ErrorResponse} instance.

spring-web/src/test/java/org/springframework/http/converter/json/ProblemDetailJacksonMixinTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 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.