fix java 17 related issue

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>

Author: tzolov

mcp/src/main/java/io/modelcontextprotocol/client/transport/HttpClientSseClientTransport.java

@@ -426,7 +426,12 @@ public Mono<Void> sendMessage(JSONRPCMessage message) {
 			try {
 				return this.serializeMessage(message)
 					.flatMap(body -> sendHttpPost(messageEndpointUri, body))
-					.doOnNext(this::logIfNotOk)
+					.doOnNext(response -> {
+						if (response.statusCode() != 200 && response.statusCode() != 201 && response.statusCode() != 202
+								&& response.statusCode() != 206) {
+							logger.error("Error sending message: {}", response.statusCode());
+						}
+					})
 					.doOnError(error -> {
 						if (!isClosing) {
 							logger.error("Error sending message: {}", error.getMessage());
@@ -465,13 +470,6 @@ private Mono<HttpResponse<Void>> sendHttpPost(final String endpoint, final Strin
 		return Mono.fromFuture(httpClient.sendAsync(request, HttpResponse.BodyHandlers.discarding()));
 	}
 
-	private void logIfNotOk(final HttpResponse<?> response) {
-		if (response.statusCode() != 200 && response.statusCode() != 201 && response.statusCode() != 202
-				&& response.statusCode() != 206) {
-			logger.error("Error sending message: {}", response.statusCode());
-		}
-	}
-
 	/**
 	 * Gracefully closes the transport connection.
 	 *