chore: Added more logging information to MCVersionMappingCacheImpl

framework/platforms/mc-platform/src/main/java/io/fairyproject/mc/version/cache/MCVersionMappingCacheImpl.java

@@ -5,6 +5,7 @@
 import com.google.gson.stream.JsonReader;
 import io.fairyproject.Fairy;
 import io.fairyproject.log.Log;
+import io.fairyproject.util.exceptionally.SneakyThrowUtil;
 import lombok.RequiredArgsConstructor;
 import org.jetbrains.annotations.NotNull;
 
@@ -13,6 +14,7 @@
 import java.io.InputStreamReader;
 import java.net.URL;
 import java.net.URLConnection;
+import java.net.UnknownHostException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.StandardOpenOption;
@@ -41,9 +43,21 @@ public JsonArray read() {
 
     @Override
     public @NotNull JsonArray load() throws IOException {
-        URLConnection urlConnection = new URL("https://raw.githubusercontent.com/PrismarineJS/minecraft-data/master/data/pc/common/protocolVersions.json").openConnection();
-        // load the output of the connection into a json array
-        return gson.fromJson(new JsonReader(new InputStreamReader(urlConnection.getInputStream())), JsonArray.class);
+        String url = "https://raw.githubusercontent.com/PrismarineJS/minecraft-data/master/data/pc/common/protocolVersions.json";
+
+        try {
+            URLConnection urlConnection = new URL(url).openConnection();
+            // load the output of the connection into a json array
+            return gson.fromJson(new JsonReader(new InputStreamReader(urlConnection.getInputStream())), JsonArray.class);
+        } catch (UnknownHostException e) {
+            io.fairyproject.log.Log.error("Unable to locate raw.githubusercontent.com, please check your internet connection.");
+            io.fairyproject.log.Log.error("If you are behind a proxy, please make sure to configure it properly.");
+            io.fairyproject.log.Log.error("If you are using a firewall, please make sure to whitelist the connection.");
+            io.fairyproject.log.Log.error("Fairy is trying to load " + url + " to get the latest protocol versions, please whitelist it at least once.");
+
+            SneakyThrowUtil.sneakyThrow(e);
+            return null;
+        }
     }
 
     @Override