Added and fixed existing Javadoc, configured Javadoc validation

src/main/java/envoy/client/ui/Startup.java

@@ -22,7 +22,7 @@ import envoy.schema.User;
  * Project: <strong>envoy-client</strong><br>
  * File: <strong>Startup.java</strong><br>
  * Created: <strong>12 Oct 2019</strong><br>
- * 
+ *
  * @author Leon Hofmeister
  * @author Maximilian K&auml;fer
  * @author Kai S. K. Engelbart
@@ -32,6 +32,16 @@ public class Startup {
 
 	private static final Logger logger = EnvoyLog.getLogger(Startup.class.getSimpleName());
 
+	/**
+	 * Loads the application by first loading the configuration, then acquiring a
+	 * user name and connecting to the server. If the server cannot be reached,
+	 * offline mode is entered if possible. After that, a {@link ChatWindow}
+	 * instance is initialized and then displayed to the user. Upon application
+	 * exit, settings and the local database are saved.
+	 *
+	 * @param args the command line arguments may contain configuration parameters
+	 *             and are parsed by the {@link Config} class
+	 */
 	public static void main(String[] args) {
 		Config config = Config.getInstance();
 
@@ -127,7 +137,7 @@ public class Startup {
 				e.printStackTrace();
 			}
 		});
-		
+
 		// Save Settings and LocalDB on shutdown
 		Runtime.getRuntime().addShutdownHook(new Thread(() -> {
 			try {