Upgrade to Java 21

.gitignore

@@ -10,3 +10,4 @@ MadCommander.log*
 *.iml
 pom.xml.versionsBackup
 tags 
+.vscode/

README.md

@@ -8,7 +8,7 @@ NeoCommander
 
 ### Requirements
 
-  * Java SE 17
+  * Java 21
   * Graphical user interface environment
 
 ### How to build
@@ -19,8 +19,8 @@ mvn package
 
 ### How to run
 
-```sh
-java -jar target/NeoCommander-1.4.11-jar-with-dependencies.jar
+```shell
+java -jar target/NeoCommander-1.4.12-jar-with-dependencies.jar
 ```
 
 or double click on the jar file using your default file manager.

pom.xml

@@ -3,7 +3,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>com.santiagolizardo.neocommander</groupId>
 	<artifactId>NeoCommander</artifactId>
-	<version>1.4.11</version>
+	<version>1.4.12</version>
 	<packaging>jar</packaging>
 	<name>NeoCommander</name>
 	<url>https://github.com/santiagolizardo/neocommander</url>
@@ -35,13 +35,13 @@
 				<artifactId>maven-compiler-plugin</artifactId>
                 <version>3.8.1</version>
                 <configuration>
-                    <release>17</release>
+                    <release>21</release>
                     <compilerArgs>
                         <arg>-Xlint:deprecation</arg>
                         <arg>-Xlint:unchecked</arg>
                     </compilerArgs>
-                    <source>17</source>
-                    <target>17</target>
+                    <source>21</source>
+                    <target>21</target>
                 </configuration>
 			</plugin>
 			<plugin>

src/main/java/com/santiagolizardo/madcommander/AppConstants.java

@@ -18,13 +18,13 @@
 
 public final class AppConstants {
 
-	private AppConstants() {
-		
-	}
-	
-	public final static String APP_NAME = "NeoCommander";
-	public final static String APP_VERSION = "1.4.9";
-	public final static String APP_URL = "https://github.com/santiagolizardo/neocommander";
-	public final static String DOWNLOAD_URL = "https://github.com/santiagolizardo/neocommander/releases";
+  private AppConstants() {
+
+  }
+
+  public final static String APP_NAME = "NeoCommander";
+  public final static String APP_VERSION = "1.4.12";
+  public final static String APP_URL = "https://github.com/santiagolizardo/neocommander";
+  public final static String DOWNLOAD_URL = "https://github.com/santiagolizardo/neocommander/releases";
 
 }

src/main/java/com/santiagolizardo/madcommander/resources/languages/Translator.java

@@ -16,14 +16,14 @@
  */
 package com.santiagolizardo.madcommander.resources.languages;
 
-import org.xnap.commons.i18n.I18n;
-import org.xnap.commons.i18n.I18nFactory;
-
 import java.util.Locale;
 import java.util.MissingResourceException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
+import org.xnap.commons.i18n.I18n;
+import org.xnap.commons.i18n.I18nFactory;
+
 public class Translator {
 
 	private static final Logger logger = Logger.getLogger(Translator.class
@@ -32,7 +32,7 @@ public class Translator {
 	private static I18n i18n;
 
 	public static void start(String language) {
-		Locale locale = new Locale(language);
+		Locale locale = Locale.forLanguageTag(language);
 
 		try {
 			i18n = I18nFactory.getI18n(Translator.class, locale);
@@ -52,7 +52,7 @@ public static String tr(String text) {
 			return text;
 		}
 	}
-	
+
 	public static String trn(String text, String pluralText, long number) {
 		if (null == i18n)
 			return text;
@@ -63,5 +63,5 @@ public static String trn(String text, String pluralText, long number) {
 			logger.log(Level.WARNING, "Missing translation: {0}", mre.getKey());
 			return text;
 		}
-	}	
+	}
 }

src/main/java/com/santiagolizardo/madcommander/util/UpdateManager.java

@@ -16,17 +16,18 @@
  */
 package com.santiagolizardo.madcommander.util;
 
-import com.santiagolizardo.madcommander.AppConstants;
-import com.santiagolizardo.madcommander.util.gui.DialogFactory;
-
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.net.URI;
+import java.net.URISyntaxException;
 import java.net.URL;
 
+import com.santiagolizardo.madcommander.AppConstants;
+import com.santiagolizardo.madcommander.util.gui.DialogFactory;
 
 public final class UpdateManager extends Thread {
-	
+
 	public static void checkForUpdate() {
 		UpdateManager updateManager = new UpdateManager();
 		updateManager.start();
@@ -39,9 +40,10 @@ private UpdateManager() {
 	@Override
 	public void run() {
 		try {
-			URL url = new URL("http://madcommander.sourceforge.net/version.html");
+			URL url = new URI("http://madcommander.sourceforge.net/version.html").toURL();
 			String version;
-			try (InputStreamReader reader = new InputStreamReader(url.openStream()); BufferedReader buffer = new BufferedReader(reader)) {
+			try (InputStreamReader reader = new InputStreamReader(url.openStream());
+					BufferedReader buffer = new BufferedReader(reader)) {
 				version = buffer.readLine();
 			}
 			int serverVersion = Integer
@@ -61,7 +63,7 @@ public void run() {
 						"There are no updates availables.");
 			}
 
-		} catch (IOException | NumberFormatException e) {
+		} catch (IOException | NumberFormatException | URISyntaxException e) {
 			DialogFactory.showErrorMessage(null, e.getMessage());
 		}