add preference to allow users to set a specific port for the embedded mcp server

Author: martinlippert

eclipse-language-servers/org.springframework.tooling.boot.ls/src/org/springframework/tooling/boot/ls/Constants.java

@@ -60,6 +60,7 @@ public class Constants {
 
 	public static final String PREF_CODELENS_WEB_CONFIGS_ON_CONTROLLER_CLASSES = "boot-java.java.codelens-web-configs-on-controller-classes";
 
-	public static final String PREF_AI_ENABLE_MCP = "boot-java.ai.mcp-server-enabled";
+	public static final String PREF_AI_MCP_ENABLED = "boot-java.ai.mcp-server-enabled";
+	public static final String PREF_AI_MCP_PORT = "boot-java.ai.mcp-server-port";
 
 }

eclipse-language-servers/org.springframework.tooling.boot.ls/src/org/springframework/tooling/boot/ls/DelegatingStreamConnectionProvider.java

@@ -270,7 +270,8 @@ private void sendConfiguration() {
 		);
 
 		bootJavaObj.put("ai", Map.of(
-				"mcp-server-enabled", preferenceStore.getBoolean(Constants.PREF_AI_ENABLE_MCP)
+				"mcp-server-enabled", preferenceStore.getBoolean(Constants.PREF_AI_MCP_ENABLED),
+				"mcp-server-port", preferenceStore.getBoolean(Constants.PREF_AI_MCP_PORT) 
 			)
 		);
 

eclipse-language-servers/org.springframework.tooling.boot.ls/src/org/springframework/tooling/boot/ls/SpringBootLanguageServer.java

@@ -47,10 +47,15 @@ private List<String> getJVMArgs() {
 		args.add("-Dspring.config.location=classpath:/application.properties");
 
 		// disable embedded MCP server, depending on preference
-		if (BootLanguageServerPlugin.getDefault().getPreferenceStore().getBoolean(Constants.PREF_AI_ENABLE_MCP) == false) {
+		if (BootLanguageServerPlugin.getDefault().getPreferenceStore().getBoolean(Constants.PREF_AI_MCP_ENABLED) == false) {
 			args.add("-Dspring.main.web-application-type=NONE");
 		}
 
+		int mcpServerPort = BootLanguageServerPlugin.getDefault().getPreferenceStore().getInt(Constants.PREF_AI_MCP_PORT);
+		if (mcpServerPort >= 0 && mcpServerPort < 65536) {
+			args.add("-Dserver.port=" + mcpServerPort);
+		}
+
 		addCustomJVMArgs(args);
 
 		return args;

eclipse-language-servers/org.springframework.tooling.boot.ls/src/org/springframework/tooling/boot/ls/prefs/AiConfigPreferencePage.java

@@ -12,6 +12,7 @@
 
 import org.eclipse.jface.preference.BooleanFieldEditor;
 import org.eclipse.jface.preference.FieldEditorPreferencePage;
+import org.eclipse.jface.preference.StringFieldEditor;
 import org.eclipse.swt.widgets.Composite;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPreferencePage;
@@ -24,10 +25,6 @@ public AiConfigPreferencePage() {
 		super(GRID);
 	}
 
-	@Override
-	protected void adjustGridLayout() {
-	}
-
 	@Override
 	public void init(IWorkbench workbench) {
 		setPreferenceStore(BootLanguageServerPlugin.getDefault().getPreferenceStore());
@@ -36,8 +33,8 @@ public void init(IWorkbench workbench) {
 	@Override
 	protected void createFieldEditors() {
 		Composite fieldEditorParent = getFieldEditorParent();
-		addField(new BooleanFieldEditor(Constants.PREF_AI_ENABLE_MCP, "Enable embedded MCP server", fieldEditorParent));
+		addField(new BooleanFieldEditor(Constants.PREF_AI_MCP_ENABLED, "Enable embedded MCP server", fieldEditorParent));
+		addField(new StringFieldEditor(Constants.PREF_AI_MCP_PORT, "Port used by the embedded MCP server", fieldEditorParent));
 	}
 
-
 }

eclipse-language-servers/org.springframework.tooling.boot.ls/src/org/springframework/tooling/boot/ls/prefs/PrefsInitializer.java

@@ -69,7 +69,8 @@ public void initializeDefaultPreferences() {
 		preferenceStore.setDefault(Constants.PREF_CODELENS_QUERY_METHODS, true);
 		preferenceStore.setDefault(Constants.PREF_CODELENS_WEB_CONFIGS_ON_CONTROLLER_CLASSES, true);
 
-		preferenceStore.setDefault(Constants.PREF_AI_ENABLE_MCP, true);
+		preferenceStore.setDefault(Constants.PREF_AI_MCP_ENABLED, true);
+		preferenceStore.setDefault(Constants.PREF_AI_MCP_PORT, 0);
 	}
 
 }

vscode-extensions/vscode-spring-boot/lib/Main.ts

@@ -48,11 +48,16 @@ export function activate(context: ExtensionContext): Thenable<ExtensionAPI> {
 
     const specificVmArgs = ["-Dspring.config.location=classpath:/application.properties"];
 
-    const workspaceConfig = workspace.getConfiguration("boot-java.ai");
-    if (workspaceConfig.get("mcp-server-enabled") === false) {
+    const aiPreferencesConfig = workspace.getConfiguration("boot-java.ai");
+    if (aiPreferencesConfig.get("mcp-server-enabled") === false) {
         specificVmArgs.push("-Dspring.main.web-application-type=NONE");
     }
 
+    var mcpServerPort = aiPreferencesConfig.get<number>("mcp-server-port", 0);
+    if (mcpServerPort >= 0 && mcpServerPort <= 655536) {
+        specificVmArgs.push("-Dserver.port=" + mcpServerPort);
+    }
+
     let options : commons.ActivatorOptions = {
         DEBUG: false,
         CONNECT_TO_LS: false,

vscode-extensions/vscode-spring-boot/package.json

@@ -586,6 +586,11 @@
             "type": "boolean",
             "default": true,
             "description": "Enable embedded MCP server"
+          },
+          "boot-java.ai.mcp-server-port": {
+            "type": "integer",
+            "default": 0,
+            "description": "Port used by the embedded MCP serverr"
           }
         }
       },