Update mcp to 0.16.0 and fix progress-token type

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

Author: tzolov

mcp-annotations/src/main/java/org/springaicommunity/mcp/context/DefaultMcpAsyncRequestContext.java

@@ -175,7 +175,7 @@ public Mono<CreateMessageResult> sample(Consumer<SamplingSpec> samplingSpec) {
 
 		var progressToken = this.request.progressToken();
 
-		if (!Utils.hasText(progressToken)) {
+		if (progressToken == null || (progressToken instanceof String pt && !Utils.hasText(pt))) {
 			logger.warn("Progress notification not supported by the client!");
 		}
 		return this.sample(McpSchema.CreateMessageRequest.builder()
@@ -220,13 +220,15 @@ public Mono<Void> progress(Consumer<ProgressSpec> progressSpec) {
 
 		progressSpec.accept(spec);
 
-		if (!Utils.hasText(this.request.progressToken())) {
+		var progressToken = this.request.progressToken();
+
+		if (progressToken == null || (progressToken instanceof String pt && !Utils.hasText(pt))) {
 			logger.warn("Progress notification not supported by the client!");
 			return Mono.empty();
 		}
 
-		return this.progress(new ProgressNotification(this.request.progressToken(), spec.progress, spec.total,
-				spec.message, spec.meta));
+		return this
+			.progress(new ProgressNotification(progressToken, spec.progress, spec.total, spec.message, spec.meta));
 	}
 
 	@Override

mcp-annotations/src/main/java/org/springaicommunity/mcp/context/DefaultMcpSyncRequestContext.java

@@ -270,13 +270,14 @@ public void progress(Consumer<ProgressSpec> progressSpec) {
 
 		progressSpec.accept(spec);
 
-		if (!Utils.hasText(this.request.progressToken())) {
+		var progressToken = this.request.progressToken();
+
+		if (progressToken == null || (progressToken instanceof String pt && !Utils.hasText(pt))) {
 			logger.warn("Progress notification not supported by the client!");
 			return;
 		}
 
-		this.progress(new ProgressNotification(this.request.progressToken(), spec.progress, spec.total, spec.message,
-				spec.meta));
+		this.progress(new ProgressNotification(progressToken, spec.progress, spec.total, spec.message, spec.meta));
 	}
 
 	@Override

pom.xml

@@ -56,7 +56,7 @@
 		<maven.compiler.source>17</maven.compiler.source>
 		<maven.compiler.target>17</maven.compiler.target>
 
-		<mcp.java.sdk.version>0.15.0</mcp.java.sdk.version>
+		<mcp.java.sdk.version>0.16.0</mcp.java.sdk.version>
 
 		<jsonschema.version>4.38.0</jsonschema.version>
 		<swagger-annotations.version>2.2.36</swagger-annotations.version>