ResponseEntityExceptionHandler handles AsyncRequestNotUsableException

Closes gh-33225

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

@@ -48,6 +48,7 @@ import org.springframework.web.bind.annotation.ControllerAdvice;
 import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.context.request.ServletWebRequest;
 import org.springframework.web.context.request.WebRequest;
+import org.springframework.web.context.request.async.AsyncRequestNotUsableException;
 import org.springframework.web.context.request.async.AsyncRequestTimeoutException;
 import org.springframework.web.method.annotation.HandlerMethodValidationException;
 import org.springframework.web.multipart.MaxUploadSizeExceededException;
@@ -135,7 +136,8 @@ public abstract class ResponseEntityExceptionHandler implements MessageSourceAwa
 			HttpMessageNotReadableException.class,
 			HttpMessageNotWritableException.class,
 			MethodValidationException.class,
-			BindException.class
+			BindException.class,
+			AsyncRequestNotUsableException.class
 		})
 	@Nullable
 	public final ResponseEntity<Object> handleException(Exception ex, WebRequest request) throws Exception {
@@ -197,8 +199,11 @@ public abstract class ResponseEntityExceptionHandler implements MessageSourceAwa
 		else if (ex instanceof HttpMessageNotWritableException theEx) {
 			return handleHttpMessageNotWritable(theEx, headers, HttpStatus.INTERNAL_SERVER_ERROR, request);
 		}
-		else if (ex instanceof MethodValidationException subEx) {
-			return handleMethodValidationException(subEx, headers, HttpStatus.INTERNAL_SERVER_ERROR, request);
+		else if (ex instanceof MethodValidationException theEx) {
+			return handleMethodValidationException(theEx, headers, HttpStatus.INTERNAL_SERVER_ERROR, request);
+		}
+		else if (ex instanceof AsyncRequestNotUsableException theEx) {
+			return handleAsyncRequestNotUsableException(theEx, request);
 		}
 		else {
 			// Unknown exception, typically a wrapper with a common MVC exception as cause
@@ -568,6 +573,22 @@ public abstract class ResponseEntityExceptionHandler implements MessageSourceAwa
 		return handleExceptionInternal(ex, body, headers, status, request);
 	}
 
+	/**
+	 * Customize the handling of {@link AsyncRequestNotUsableException}.
+	 * <p>By default, return {@code null} since the response is not usable.
+	 * @param ex the exception to handle
+	 * @param request the current request
+	 * @return a {@code ResponseEntity} for the response to use, possibly
+	 * {@code null} when the response is already committed
+	 * @since 6.2
+	 */
+	@Nullable
+	protected ResponseEntity<Object> handleAsyncRequestNotUsableException(
+			AsyncRequestNotUsableException ex, WebRequest request) {
+
+		return null;
+	}
+
 	/**
 	 * Convenience method to create a {@link ProblemDetail} for any exception
 	 * that doesn't implement {@link ErrorResponse}, also performing a