diff --git a/index.html b/index.html
index ee11923aa..90a68733a 100644
--- a/index.html
+++ b/index.html
@@ -24,7 +24,7 @@ <h3>Python language client and language server</h3>
         <a href="packages/examples/python.html">Client for Python Pyright Language Server</a>
         <h3>Groovy language client and language server</h3>
         Please execute <b><code>npm run start:example:server:groovy</code></b> beforehand:<br>
-        <a href="packages/examples/groovy.html">Client for Node.js Language Server</a>
+        <a href="packages/examples/groovy.html">Client for Groovy Language Server</a>
         <h3>Langium client and language server</h3>
         <a href="packages/examples/statemachine_client.html">Client & Statemachine LS (Web Worker)</a><br>
         Localizations: <a href="packages/examples/statemachine_client.html?locale=de">German</a> <a href="packages/examples/statemachine_client.html?locale=fr">French</a> and <a href="packages/examples/statemachine_client.html?locale=es">Spanish</a><br>
diff --git a/packages/examples/.gitignore b/packages/examples/.gitignore
index 0388e142d..3d9c982b2 100644
--- a/packages/examples/.gitignore
+++ b/packages/examples/.gitignore
@@ -1 +1,2 @@
 resources/themes
+src/groovy/server/groovy-language-server-all.jar
diff --git a/packages/examples/src/common/model.ts b/packages/examples/src/common/model.ts
index caaaab0d4..ce910feca 100644
--- a/packages/examples/src/common/model.ts
+++ b/packages/examples/src/common/model.ts
@@ -4,11 +4,18 @@
  * ------------------------------------------------------------------------------------------ */
 import * as cp from 'child_process';
 import { ServerOptions } from 'ws';
+
+export enum LanguageCli {
+    /** https://nodejs.org/api/cli.html  */
+    node = 'node',
+    /** https://docs.oracle.com/en/java/javase/21/docs/specs/man/java.html */
+    java = 'java'
+}
 export interface LanguageServerRunConfig {
     serverName: string;
     pathName: string;
     serverPort: number;
-    runCommand: string; // 'node', 'java' , etc.
+    runCommand: LanguageCli;
     runCommandArgs: string[];
     wsServerOptions: ServerOptions,
     spawnOptions?: cp.SpawnOptions;
diff --git a/packages/examples/src/groovy/config.ts b/packages/examples/src/groovy/config.ts
index 2b8e17289..6e5a7f7e6 100644
--- a/packages/examples/src/groovy/config.ts
+++ b/packages/examples/src/groovy/config.ts
@@ -4,6 +4,6 @@
  * ------------------------------------------------------------------------------------------ */
 
 export const groovyConfig = {
-    port: 3001,
+    port: 3002,
     path: '/groovy'
 };
diff --git a/packages/examples/src/groovy/server/main.ts b/packages/examples/src/groovy/server/main.ts
index 733ee8d32..672333588 100644
--- a/packages/examples/src/groovy/server/main.ts
+++ b/packages/examples/src/groovy/server/main.ts
@@ -6,13 +6,14 @@
 import { runLanguageServer } from '../../common/language-server-runner.js';
 import { resolve } from 'path';
 import { groovyConfig } from '../config.js';
+import { LanguageCli } from '../../common/model.js';
 export const runGroovyLanguageServer = (baseDir: string, relativeDir: string) => {
     const processRunPath = resolve(baseDir, relativeDir);
     runLanguageServer({
         serverName: 'GROOVY',
         pathName: groovyConfig.path,
         serverPort: groovyConfig.port,
-        runCommand: 'java',
+        runCommand: LanguageCli.java,
         runCommandArgs: [
             '-jar',
             processRunPath
diff --git a/packages/examples/src/json/server/main.ts b/packages/examples/src/json/server/main.ts
index 738927af8..0b2b86c82 100644
--- a/packages/examples/src/json/server/main.ts
+++ b/packages/examples/src/json/server/main.ts
@@ -4,6 +4,7 @@
  * ------------------------------------------------------------------------------------------ */
 import { runLanguageServer } from '../../common/language-server-runner.js';
 import { resolve } from 'path';
+import { LanguageCli } from '../../common/model.js';
 
 export const runJsonServer = (baseDir: string, relativeDir: string) => {
     const processRunPath = resolve(baseDir, relativeDir);
@@ -11,7 +12,7 @@ export const runJsonServer = (baseDir: string, relativeDir: string) => {
         serverName: 'JSON',
         pathName: '/sampleServer',
         serverPort: 30000,
-        runCommand: 'node',
+        runCommand: LanguageCli.node,
         runCommandArgs: [
             processRunPath,
             '--stdio'
diff --git a/packages/examples/src/python/server/main.ts b/packages/examples/src/python/server/main.ts
index d88304e3c..13b9d0e02 100644
--- a/packages/examples/src/python/server/main.ts
+++ b/packages/examples/src/python/server/main.ts
@@ -6,6 +6,7 @@
 import { resolve } from 'path';
 import { runLanguageServer } from '../../common/language-server-runner.js';
 import { IncomingMessage } from 'http';
+import { LanguageCli } from '../../common/model.js';
 
 export const runPythonServer = (baseDir: string, relativeDir: string) => {
     const processRunPath = resolve(baseDir, relativeDir);
@@ -13,7 +14,7 @@ export const runPythonServer = (baseDir: string, relativeDir: string) => {
         serverName: 'PYRIGHT',
         pathName: '/pyright',
         serverPort: 30001,
-        runCommand: 'node',
+        runCommand: LanguageCli.node,
         runCommandArgs: [
             processRunPath,
             '--stdio'