GH-1620: show the port the embedded MCP server is running at via a message - as in intermediate step

Author: martinlippert

headless-services/spring-boot-language-server/src/main/java/org/springframework/ide/vscode/boot/mcp/EmbeddedMcpServer.java

@@ -0,0 +1,38 @@
+/*******************************************************************************
+ * Copyright (c) 2025 Broadcom
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * https://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Broadcom - initial API and implementation
+ *******************************************************************************/
+package org.springframework.ide.vscode.boot.mcp;
+
+import org.eclipse.lsp4j.MessageParams;
+import org.eclipse.lsp4j.MessageType;
+import org.springframework.boot.web.servlet.context.ServletWebServerInitializedEvent;
+import org.springframework.context.event.EventListener;
+import org.springframework.ide.vscode.commons.languageserver.util.SimpleLanguageServer;
+import org.springframework.stereotype.Component;
+
+@Component
+public class EmbeddedMcpServer {
+	
+	private SimpleLanguageServer server;
+
+	public EmbeddedMcpServer(SimpleLanguageServer server) {
+		this.server = server;
+	}
+	
+    @EventListener
+    public void onApplicationEvent(final ServletWebServerInitializedEvent event) {
+        int port = event.getWebServer().getPort();
+        
+        server.doOnInitialized(() -> {
+        	server.getClient().showMessage(new MessageParams(MessageType.Info, "Embedded Spring Tools MCP server started at port: " + port));
+        });
+    }
+
+}

headless-services/spring-boot-language-server/src/main/resources/application.properties

@@ -19,5 +19,6 @@ spring.ai.mcp.server.enabled=true
 spring.ai.mcp.server.stdio=false
 spring.ai.mcp.server.name=spring-language-server-mcp
 spring.ai.mcp.server.version=2.0.0
+
 server.port=0
 server.address=localhost