Some cleanup

api/src/main/java/com/viaversion/viaversion/api/command/ViaVersionCommand.java

@@ -32,7 +32,7 @@ public interface ViaVersionCommand {
      * @param command Your own SubCommand instance to handle it.
      * @throws Exception throws an exception when the subcommand already exists or if it's not valid, example: spacee
      */
-    void registerSubCommand(ViaSubCommand command) throws Exception;
+    void registerSubCommand(ViaSubCommand command);
 
     /**
      * Check if a subcommand is registered.

bukkit/src/main/java/com/viaversion/viaversion/bukkit/platform/BukkitViaLoader.java

@@ -48,6 +48,7 @@ import java.util.HashSet;
 import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
 import org.bukkit.Bukkit;
 import org.bukkit.Material;
 import org.bukkit.entity.Player;
@@ -111,8 +112,7 @@ public class BukkitViaLoader implements ViaPlatformLoader {
                 try {
                     new PlayerSneakListener(plugin, use1_9Fix, plugin.getConf().is1_14HitboxFix()).register();
                 } catch (ReflectiveOperationException e) {
-                    Via.getPlatform().getLogger().warning("Could not load hitbox fix - please report this on our GitHub");
+                    Via.getPlatform().getLogger().log(Level.WARNING, "Could not load hitbox fix - please report this on our GitHub", e);
-                    e.printStackTrace();
                 }
             }
         }
@@ -165,9 +165,7 @@ public class BukkitViaLoader implements ViaPlatformLoader {
                             return null;
                         }).get(10, TimeUnit.SECONDS);
                     } catch (Exception e) {
-                        Via.getPlatform().getLogger().severe("Error fetching hand item: " + e.getClass().getName());
+                        Via.getPlatform().getLogger().log(Level.SEVERE, "Error fetching hand item", e);
-                        if (Via.getManager().isDebug())
-                            e.printStackTrace();
                         return null;
                     }
                 }

bungee/src/main/java/com/viaversion/viaversion/bungee/commands/BungeeCommandHandler.java

@@ -17,17 +17,11 @@
  */
 package com.viaversion.viaversion.bungee.commands;
 
-import com.viaversion.viaversion.api.Via;
 import com.viaversion.viaversion.bungee.commands.subs.ProbeSubCmd;
 import com.viaversion.viaversion.commands.ViaCommandHandler;
 
 public class BungeeCommandHandler extends ViaCommandHandler {
     public BungeeCommandHandler() {
-        try {
         registerSubCommand(new ProbeSubCmd());
-        } catch (Exception e) {
-            Via.getPlatform().getLogger().severe("Failed to register Bungee subcommands");
-            e.printStackTrace();
-        }
     }
 }

bungee/src/main/java/com/viaversion/viaversion/bungee/providers/BungeeVersionProvider.java

@@ -28,27 +28,14 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import net.md_5.bungee.api.ProxyServer;
+import net.md_5.bungee.protocol.ProtocolConstants;
 
 public class BungeeVersionProvider extends BaseVersionProvider {
-    private static Class<?> ref;
-
-    static {
-        try {
-            ref = Class.forName("net.md_5.bungee.protocol.ProtocolConstants");
-        } catch (Exception e) {
-            Via.getPlatform().getLogger().severe("Could not detect the ProtocolConstants class");
-            e.printStackTrace();
-        }
-    }
 
     @Override
     public int getClosestServerProtocol(UserConnection user) throws Exception {
-        if (ref == null) {
-            return super.getClosestServerProtocol(user);
-        }
-
         // TODO Have one constant list forever until restart? (Might limit plugins if they change this)
-        List<Integer> list = ReflectionUtil.getStatic(ref, "SUPPORTED_VERSION_IDS", List.class);
+        List<Integer> list = ReflectionUtil.getStatic(ProtocolConstants.class, "SUPPORTED_VERSION_IDS", List.class);
         List<Integer> sorted = new ArrayList<>(list);
         Collections.sort(sorted);
 
@@ -79,7 +66,7 @@ public class BungeeVersionProvider extends BaseVersionProvider {
     public static int getLowestSupportedVersion() {
         List<Integer> list;
         try {
-            list = ReflectionUtil.getStatic(ref, "SUPPORTED_VERSION_IDS", List.class);
+            list = ReflectionUtil.getStatic(ProtocolConstants.class, "SUPPORTED_VERSION_IDS", List.class);
             return list.get(0);
         } catch (NoSuchFieldException | IllegalAccessException e) {
             e.printStackTrace();

common/src/main/java/com/viaversion/viaversion/ViaManagerImpl.java

@@ -49,6 +49,7 @@ import java.util.Arrays;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
+import java.util.logging.Level;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
@@ -99,8 +100,7 @@ public class ViaManagerImpl implements ViaManager {
         try {
             injector.inject();
         } catch (Exception e) {
-            platform.getLogger().severe("ViaVersion failed to inject:");
+            platform.getLogger().log(Level.SEVERE, "ViaVersion failed to inject:", e);
-            e.printStackTrace();
             return;
         }
 
@@ -196,8 +196,7 @@ public class ViaManagerImpl implements ViaManager {
 
             protocolManager.setServerProtocol(versionInfo);
         } catch (Exception e) {
-            platform.getLogger().severe("ViaVersion failed to get the server protocol!");
+            platform.getLogger().log(Level.SEVERE, "ViaVersion failed to get the server protocol!", e);
-            e.printStackTrace();
         }
     }
 
@@ -207,8 +206,7 @@ public class ViaManagerImpl implements ViaManager {
         try {
             injector.uninject();
         } catch (Exception e) {
-            platform.getLogger().severe("ViaVersion failed to uninject:");
+            platform.getLogger().log(Level.SEVERE, "ViaVersion failed to uninject:", e);
-            e.printStackTrace();
         }
 
         loader.unload();
@@ -228,8 +226,7 @@ public class ViaManagerImpl implements ViaManager {
         try {
             version = Integer.parseInt(versionString);
         } catch (NumberFormatException e) {
-            platform.getLogger().warning("Failed to determine Java version; could not parse: " + versionString);
+            platform.getLogger().log(Level.WARNING, "Failed to determine Java version; could not parse: " + versionString, e);
-            e.printStackTrace();
             return;
         }
 

common/src/main/java/com/viaversion/viaversion/platform/LegacyViaInjector.java

@@ -32,6 +32,7 @@ import io.netty.channel.ChannelPipeline;
 import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.logging.Level;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public abstract class LegacyViaInjector implements ViaInjector {
@@ -141,8 +142,7 @@ public abstract class LegacyViaInjector implements ViaInjector {
                     ReflectionUtil.set(bootstrapAcceptor, "childHandler", ((WrappedChannelInitializer) initializer).original());
                 }
             } catch (Exception e) {
-                Via.getPlatform().getLogger().severe("Failed to remove injection handler, reload won't work with connections, please reboot!");
+                Via.getPlatform().getLogger().log(Level.SEVERE, "Failed to remove injection handler, reload won't work with connections, please reboot!", e);
-                e.printStackTrace();
             }
         }
 

common/src/main/java/com/viaversion/viaversion/protocol/ProtocolManagerImpl.java

@@ -82,6 +82,7 @@ import it.unimi.dsi.fastutil.ints.Int2ObjectLinkedOpenHashMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectSortedMap;
+import java.util.logging.Level;
 import org.checkerframework.checker.nullness.qual.Nullable;
 import us.myles.ViaVersion.api.protocol.ProtocolRegistry;
 
@@ -514,8 +515,7 @@ public class ProtocolManagerImpl implements ProtocolManager {
 
     private Function<Throwable, Void> mappingLoaderThrowable(Class<? extends Protocol> protocolClass) {
         return throwable -> {
-            Via.getPlatform().getLogger().severe("Error during mapping loading of " + protocolClass.getSimpleName());
+            Via.getPlatform().getLogger().log(Level.SEVERE, "Error during mapping loading of " + protocolClass.getSimpleName(), throwable);
-            throwable.printStackTrace();
             return null;
         };
     }

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_11to1_10/metadata/MetadataRewriter1_11To1_10.java

@@ -34,6 +34,7 @@ import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPac
 import com.viaversion.viaversion.rewriter.EntityRewriter;
 import java.util.List;
 import java.util.Optional;
+import java.util.logging.Level;
 
 public class MetadataRewriter1_11To1_10 extends EntityRewriter<ClientboundPackets1_9_3, Protocol1_11To1_10> {
 
@@ -230,7 +231,7 @@ public class MetadataRewriter1_11To1_10 extends EntityRewriter<ClientboundPacket
             if (!Via.getConfig().isSuppressMetadataErrors() || Via.getManager().isDebug()) {
                 Via.getPlatform().getLogger().warning("An error occurred with entity type rewriter");
                 Via.getPlatform().getLogger().warning("Metadata: " + metadata);
-                e.printStackTrace();
+                Via.getPlatform().getLogger().log(Level.WARNING, "Error: ", e);
             }
         }
 

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_12to1_11_1/TranslateRewriter.java

@@ -25,6 +25,7 @@ import com.viaversion.viaversion.api.connection.UserConnection;
 import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.data.AchievementTranslationMapping;
 import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
 import com.viaversion.viaversion.rewriter.ComponentRewriter;
+import java.util.logging.Level;
 
 public class TranslateRewriter {
 
@@ -91,8 +92,7 @@ public class TranslateRewriter {
                 hoverEvent.addProperty("action", "show_text");
                 hoverEvent.add("value", baseArray);
             } catch (Exception e) {
-                Via.getPlatform().getLogger().warning("Error rewriting show_achievement: " + hoverEvent);
+                Via.getPlatform().getLogger().log(Level.WARNING, "Error rewriting show_achievement: " + hoverEvent, e);
-                e.printStackTrace();
                 JsonObject invalidText = new JsonObject();
                 invalidText.addProperty("text", "Invalid statistic/achievement!");
                 invalidText.addProperty("color", "red");

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/ChatRewriter.java

@@ -26,6 +26,7 @@ import com.viaversion.viaversion.libs.kyori.adventure.text.format.TextDecoration
 import com.viaversion.viaversion.libs.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
 import com.viaversion.viaversion.libs.kyori.adventure.text.serializer.gson.legacyimpl.NBTLegacyHoverEventSerializer;
 import com.viaversion.viaversion.libs.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
+import java.util.logging.Level;
 
 public final class ChatRewriter {
     public static final GsonComponentSerializer HOVER_GSON_SERIALIZER = GsonComponentSerializer.builder().emitLegacyHoverEvent().legacyHoverEventSerializer(NBTLegacyHoverEventSerializer.get()).build();
@@ -62,8 +63,7 @@ public final class ChatRewriter {
             Component component = HOVER_GSON_SERIALIZER.deserialize(value);
             return LegacyComponentSerializer.legacySection().serialize(component);
         } catch (Exception e) {
-            Via.getPlatform().getLogger().warning("Error converting json text to legacy: " + value);
+            Via.getPlatform().getLogger().log(Level.WARNING, "Error converting json text to legacy: " + value, e);
-            e.printStackTrace();
             return "";
         }
     }

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/data/ComponentRewriter1_13.java

@@ -32,6 +32,7 @@ import com.viaversion.viaversion.api.protocol.Protocol;
 import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
 import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.Protocol1_13To1_12_2;
 import com.viaversion.viaversion.rewriter.ComponentRewriter;
+import java.util.logging.Level;
 
 public class ComponentRewriter1_13<C extends ClientboundPacketType> extends ComponentRewriter<C> {
 
@@ -56,8 +57,7 @@ public class ComponentRewriter1_13<C extends ClientboundPacketType> extends Comp
             tag = SNBT.deserializeCompoundTag(text);
         } catch (Exception e) {
             if (!Via.getConfig().isSuppressConversionWarnings() || Via.getManager().isDebug()) {
-                Via.getPlatform().getLogger().warning("Error reading NBT in show_item:" + text);
+                Via.getPlatform().getLogger().log(Level.WARNING, "Error reading NBT in show_item:" + text, e);
-                e.printStackTrace();
             }
             return;
         }
@@ -89,8 +89,7 @@ public class ComponentRewriter1_13<C extends ClientboundPacketType> extends Comp
             object.addProperty("text", serializedNBT);
             hoverEvent.add("value", array);
         } catch (Exception e) {
-            Via.getPlatform().getLogger().warning("Error writing NBT in show_item:" + text);
+            Via.getPlatform().getLogger().log(Level.WARNING, "Error writing NBT in show_item:" + text, e);
-            e.printStackTrace();
         }
     }
 

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_16_2to1_16_1/data/MappingData.java

@@ -28,6 +28,7 @@ import com.viaversion.viaversion.api.data.MappingDataLoader;
 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.logging.Level;
 
 public class MappingData extends MappingDataBase {
     private final Map<String, CompoundTag> dimensionDataMap = new HashMap<>();
@@ -42,8 +43,7 @@ public class MappingData extends MappingDataBase {
         try {
             dimensionRegistry = NBTIO.readTag(MappingDataLoader.getResource("dimension-registry-1.16.2.nbt"));
         } catch (final IOException e) {
-            Via.getPlatform().getLogger().severe("Error loading dimension registry:");
+            Via.getPlatform().getLogger().log(Level.SEVERE, "Error loading dimension registry:", e);
-            e.printStackTrace();
         }
 
         // Data of each dimension

common/src/main/java/com/viaversion/viaversion/protocols/protocol1_20_3to1_20_2/Protocol1_20_3To1_20_2.java

@@ -71,6 +71,7 @@ import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 import java.util.UUID;
+import java.util.logging.Level;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
 public final class Protocol1_20_3To1_20_2 extends AbstractProtocol<ClientboundPackets1_20_2, ClientboundPackets1_20_3, ServerboundPackets1_20_2, ServerboundPackets1_20_3> {
@@ -348,8 +349,7 @@ public final class Protocol1_20_3To1_20_2 extends AbstractProtocol<ClientboundPa
         try {
             return convertToJson(null, tag);
         } catch (final Exception e) {
-            Via.getPlatform().getLogger().severe("Error converting component: " + tag);
+            Via.getPlatform().getLogger().log(Level.SEVERE, "Error converting component: " + tag, e);
-            e.printStackTrace();
             return new JsonPrimitive("<error>");
         }
     }
@@ -358,8 +358,7 @@ public final class Protocol1_20_3To1_20_2 extends AbstractProtocol<ClientboundPa
         try {
             return convertToTag(component);
         } catch (final Exception e) {
-            Via.getPlatform().getLogger().severe("Error converting component: " + component);
+            Via.getPlatform().getLogger().log(Level.SEVERE, "Error converting component: " + component, e);
-            e.printStackTrace();
             return new StringTag("<error>");
         }
     }

common/src/main/java/com/viaversion/viaversion/rewriter/EntityRewriter.java

@@ -50,6 +50,7 @@ import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 import org.checkerframework.checker.nullness.qual.Nullable;
@@ -598,7 +599,7 @@ public abstract class EntityRewriter<C extends ClientboundPacketType, T extends
                     + " for " + (type != null ? type.name() : "untracked") + " entity type: " + metadata);
             logger.severe(metadataList.stream().sorted(Comparator.comparingInt(Metadata::id))
                     .map(Metadata::toString).collect(Collectors.joining("\n", "Full metadata: ", "")));
-            e.printStackTrace();
+            logger.log(Level.SEVERE, "Error: ", e);
         }
     }
 }

velocity/src/main/java/com/viaversion/viaversion/velocity/command/VelocityCommandHandler.java

@@ -24,11 +24,7 @@ import java.util.List;
 
 public class VelocityCommandHandler extends ViaCommandHandler implements SimpleCommand {
     public VelocityCommandHandler() {
-        try {
         registerSubCommand(new ProbeSubCmd());
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
     }
 
     @Override