Add debug output to TinyProtocol

SpigotCore/SpigotCore_Main/src/com/comphenix/tinyprotocol/TinyProtocol.java

@@ -356,6 +356,8 @@ public class TinyProtocol {
 
         // Lookup channel again
         if (channel == null) {
+            System.out.println(((CraftPlayer) player).getHandle());
+            System.out.println(((CraftPlayer) player).getHandle().connection);
             Channel playerChannel = ((CraftPlayer) player).getHandle().connection.connection.channel;
             channelLookup.put(player.getName(), channel = playerChannel);
         }

SpigotCore/SpigotCore_Main/src/de/steamwar/core/CheckpointUtilsJ9.java

@@ -24,6 +24,7 @@ import de.steamwar.Reflection;
 import de.steamwar.sql.internal.Statement;
 import io.netty.channel.ChannelFuture;
 import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.server.network.ServerConnectionListener;
 import org.bukkit.Bukkit;
 import org.bukkit.craftbukkit.CraftWorld;
@@ -79,11 +80,14 @@ class CheckpointUtilsJ9 {
                 return;
             }
 
+            e.printStackTrace();
+
             Bukkit.shutdown();
 
             if (!message.contains("Can't dump ghost file") && !message.contains("Can't create link remap")) // File/Jar has been updated
                 throw new SecurityException(e);
         } finally {
+            if (true) return;
             // Delete checkpoint
             try (Stream<Path> stream = Files.walk(path)) {
                 stream.sorted(Comparator.reverseOrder()).map(Path::toFile).forEach(File::delete);
@@ -108,6 +112,7 @@ class CheckpointUtilsJ9 {
         ServerConnectionListener serverConnection = MinecraftServer.getServer().getConnection();
         List<?> channels = channelFutures.get(serverConnection);
         for (Object future : channels) {
+            System.out.println(((ChannelFuture) future).channel() + ": " + ((ChannelFuture) future).channel().pipeline().names());
             ((ChannelFuture) future).channel().close().syncUninterruptibly();
         }
         channels.clear();
@@ -143,10 +148,15 @@ class CheckpointUtilsJ9 {
         // Reopen socket
         serverConnection.startTcpServerListener(InetAddress.getLoopbackAddress(), port);
         for (Object future : channels) {
+            System.out.println(((ChannelFuture) future).channel() + ": " + ((ChannelFuture) future).channel().pipeline().names());
             ((ChannelFuture) future).channel().config().setAutoRead(true);
         }
 
         Bukkit.getPluginManager().callEvent(new CRIUWakeupEvent());
         Core.getInstance().getLogger().log(Level.INFO, "Checkpoint restored");
+
+        for (ServerPlayer player : MinecraftServer.getServer().getPlayerList().players) {
+            System.out.println(player);
+        }
     }
 }