One line of code can make holes in the world, one line can fix them. (Fixes packet mem leak, also adds useful secret displayleaks command :) )

src/main/java/us/myles/ViaVersion/commands/ViaVersionCommand.java

@@ -1,5 +1,6 @@
 package us.myles.ViaVersion.commands;
 
+import io.netty.util.ResourceLeakDetector;
 import lombok.RequiredArgsConstructor;
 import org.bukkit.Bukkit;
 import org.bukkit.command.Command;
@@ -42,6 +43,13 @@ public class ViaVersionCommand implements CommandExecutor {
                 } else if (args[0].equalsIgnoreCase("debug")) {
                     plugin.setDebug(!plugin.isDebug());
                     sender.sendMessage(color("&6Debug mode is now " + (plugin.isDebug() ? "&aenabled" : "&cdisabled")));
+                } else if (args[0].equalsIgnoreCase("displayleaks")) {
+                    if (ResourceLeakDetector.getLevel() != ResourceLeakDetector.Level.ADVANCED) {
+                        ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.ADVANCED);
+                    } else {
+                        ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.DISABLED);
+                    }
+                    sender.sendMessage(color("&6Leak detector is now " + (ResourceLeakDetector.getLevel() == ResourceLeakDetector.Level.ADVANCED ? "&aenabled" : "&cdisabled")));
                 } else if (args[0].equalsIgnoreCase("dontbugme")) {
                     boolean newValue = !plugin.getConfig().getBoolean("checkforupdates", true);
                     plugin.getConfig().set("checkforupdates", newValue);
@@ -62,7 +70,7 @@ public class ViaVersionCommand implements CommandExecutor {
         return false;
     }
 
-    public void sendHelp(CommandSender sender){
+    public void sendHelp(CommandSender sender) {
         sender.sendMessage(color("&aViaVersion &c" + ViaVersion.getInstance().getVersion()));
         sender.sendMessage(color("&6Commands:"));
         sender.sendMessage(color("&2/viaversion list &7- &6Shows lists of all 1.9 clients and 1.8 clients."));

src/main/java/us/myles/ViaVersion/handlers/ViaDecodeHandler.java

@@ -47,6 +47,8 @@ public class ViaDecodeHandler extends ByteToMessageDecoder {
                 if (e.getCause() instanceof Exception) {
                     throw (Exception) e.getCause();
                 }
+            } finally {
+                bytebuf.release();
             }
         }
     }