Bump Classic4J to use maven central release.

gradle.properties

@@ -15,7 +15,7 @@ archives_base_name=viafabricplus
 
 # base lib
 raknet_transport_version=1.0.0.CR1-SNAPSHOT
-classic4j_version=2.0.1-SNAPSHOT
+classic4j_version=2.0.1
 
 # viaversion (and required) libs
 viaversion_version=4.9.0-23w40a-SNAPSHOT

src/main/java/de/florianmichael/viafabricplus/ViaFabricPlus.java

@@ -73,6 +73,7 @@ public void init() {
         // Load overriding jars first so other code can access the new classes
         ViaJarReplacer.loadOverridingJars();
 
+        // PreLoad Callback (for example to register new protocols)
         PreLoadCallback.EVENT.invoker().onLoad();
 
         // Classic Stuff

src/main/java/de/florianmichael/viafabricplus/protocolhack/provider/vialegacy/ViaFabricPlusClassicMPPassProvider.java

@@ -19,22 +19,28 @@
 
 import com.viaversion.viaversion.api.connection.UserConnection;
 import de.florianmichael.classic4j.BetaCraftHandler;
+import de.florianmichael.viafabricplus.ViaFabricPlus;
 import de.florianmichael.viafabricplus.integration.Classic4JImpl;
 import de.florianmichael.viafabricplus.base.settings.groups.AuthenticationSettings;
 import net.raphimc.vialegacy.protocols.classic.protocola1_0_15toc0_28_30.providers.ClassicMPPassProvider;
 import net.raphimc.vialegacy.protocols.release.protocol1_7_2_5to1_6_4.storage.HandshakeStorage;
 
 public class ViaFabricPlusClassicMPPassProvider extends ClassicMPPassProvider {
-
     public static String classiCubeMPPass;
 
     @Override
     public String getMpPass(UserConnection user) {
-        if (classiCubeMPPass != null) return classiCubeMPPass;
+        if (classiCubeMPPass != null) {
+            return classiCubeMPPass;
+        }
 
         if (AuthenticationSettings.INSTANCE.useBetaCraftAuthentication.getValue()) {
             final HandshakeStorage handshakeStorage = user.get(HandshakeStorage.class);
-            return BetaCraftHandler.requestMPPass(user.getProtocolInfo().getUsername(), handshakeStorage.getHostname(), handshakeStorage.getPort(), Classic4JImpl.JOIN_SERVER_CALL);
+            if (handshakeStorage == null) {
+                return super.getMpPass(user);
+            }
+            return BetaCraftHandler.requestMPPass(user.getProtocolInfo().getUsername(), handshakeStorage.getHostname(), handshakeStorage.getPort(), Classic4JImpl.JOIN_SERVER_CALL, throwable ->
+                    ViaFabricPlus.LOGGER.error("Error occurred while requesting the MP-Pass to verify session", throwable));
         } else {
             return super.getMpPass(user);
         }