Actually Java 11

.idea/misc.xml

@@ -8,5 +8,5 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="temurin-21" project-jdk-type="JavaSDK" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="temurin-11" project-jdk-type="JavaSDK" />
 </project>

src/main/java/eu/m724/jarupdater/download/SimpleDownloader.java

@@ -17,7 +17,6 @@ import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.security.SignatureException;
 import java.util.Arrays;
-import java.util.HexFormat;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionException;
 
@@ -59,12 +58,12 @@ public class SimpleDownloader implements Downloader {
 							}
 						}
 					
-						if (!Arrays.equals(messageDigest.digest(), HexFormat.of().parseHex(sha256hex)))
+						if (!Arrays.equals(messageDigest.digest(), hexStringToByteArray(sha256hex)))
 							throw new SignatureException(); // This is not outside try because impact is too small to justify more code
 						
 						return downloadedFile;
 						
-					} catch (IOException | NoSuchAlgorithmException | SignatureException e) { // TODO nosuchalgo should not be thrown
+					} catch (IOException | NoSuchAlgorithmException | SignatureException e) {
 						throw new CompletionException(e);
 					}
 
@@ -85,4 +84,13 @@ public class SimpleDownloader implements Downloader {
 		});
 	}
 
+	private static byte[] hexStringToByteArray(String s) {
+		int len = s.length();
+		byte[] data = new byte[len / 2];
+		for (int i = 0; i < len; i += 2) {
+			data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+					+ Character.digit(s.charAt(i + 1), 16));
+		}
+		return data;
+	}
 }

src/main/java/eu/m724/jarupdater/live/GiteaMetadataDAO.java

@@ -1,20 +1,18 @@
 package eu.m724.jarupdater.live;
 
+import com.google.gson.Gson;
+import eu.m724.jarupdater.object.Version;
+
 import java.io.IOException;
 import java.net.ProxySelector;
 import java.net.URI;
 import java.net.http.HttpClient;
 import java.net.http.HttpRequest;
 import java.net.http.HttpResponse;
-import java.net.http.HttpClient.Redirect;
-import java.net.http.HttpResponse.BodyHandlers;
 import java.util.List;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionException;
-
+import java.util.stream.Collectors;
-import com.google.gson.Gson;
-
-import eu.m724.jarupdater.object.Version;
 
 public class GiteaMetadataDAO implements MetadataDAO {
 	private final String url;
@@ -32,9 +30,9 @@ public class GiteaMetadataDAO implements MetadataDAO {
 
         return makeRequest(url).thenApply(response -> {
 			if (response.statusCode() != 200)
-                throw new CompletionException(new IOException("Server returned status code %d".formatted(response.statusCode())));
+                throw new CompletionException(new IOException("Server returned status code " + response.statusCode()));
 
-            return response.body().lines().toList();
+            return response.body().lines().collect(Collectors.toList());
         });
 	}
 
@@ -46,7 +44,7 @@ public class GiteaMetadataDAO implements MetadataDAO {
 
         return makeRequest(url).thenApply(response -> {
             if (response.statusCode() != 200)
-                throw new CompletionException(new IOException("Server returned status code %d".formatted(response.statusCode())));
+                throw new CompletionException(new IOException("Server returned status code " + response.statusCode()));
             // not throwing nosuchversionexecpion because it's not possible to tell if the server is broken or it really doesn't exist
 
             return new Gson().fromJson(response.body(), Version.class);
@@ -61,12 +59,11 @@ public class GiteaMetadataDAO implements MetadataDAO {
 				.build();
 
 		HttpClient.Builder httpClientBuilder = HttpClient.newBuilder()
-				.followRedirects(Redirect.NORMAL)
+				.followRedirects(HttpClient.Redirect.NORMAL)
 				.proxy(ProxySelector.getDefault());
 
-		try (HttpClient httpClient = httpClientBuilder.build()) {
+		HttpClient httpClient = httpClientBuilder.build();
-			return httpClient.sendAsync(request, BodyHandlers.ofString());
+		return httpClient.sendAsync(request, HttpResponse.BodyHandlers.ofString());
-		}
 	}
 	
 	private String getFileUrl(String... paths) {

src/main/java/eu/m724/jarupdater/object/NoSuchVersionException.java

@@ -1,13 +1,8 @@
 package eu.m724.jarupdater.object;
 
 import java.io.IOException;
-import java.io.Serial;
 
 public class NoSuchVersionException extends IOException {
-
-	@Serial
-	private static final long serialVersionUID = 8435964987348892266L;
-	
 	public NoSuchVersionException(String version) {
 		super(version);
 	}