Some more adjustments for MC 1.20.1

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/Database.java

@@ -121,14 +121,14 @@ public void close()
 		catch(IllegalStateException ignored) {}
 		catch(Exception e)
 		{
-			e.printStackTrace();
+			plugin.getLogger().log(Level.SEVERE, "Failed to initialize database.", e);
 		}
 		return null;
 	}
 
 	public void backup(@NotNull Backpack backpack)
 	{
-		writeBackup(backpack.getOwner().getName(), getPlayerFormattedUUID(backpack.getOwner()), itsSerializer.getUsedSerializer(), itsSerializer.serialize(backpack.getInventory()));
+		writeBackup(backpack.getOwner().getName(), getPlayerFormattedUUID(backpack.getOwnerId()), itsSerializer.getUsedSerializer(), itsSerializer.serialize(backpack.getInventory()));
 	}
 
 	protected void writeBackup(@Nullable String userName, @NotNull String userIdentifier, final int usedSerializer, final byte[] data)
@@ -172,7 +172,12 @@ public ArrayList<String> getBackups()
 
 	protected String getPlayerFormattedUUID(OfflinePlayer player)
 	{
-		return (useUUIDSeparators) ? player.getUniqueId().toString() : player.getUniqueId().toString().replace("-", "");
+		return getPlayerFormattedUUID(player.getUniqueId());
+	}
+
+	protected String getPlayerFormattedUUID(UUID uuid)
+	{
+		return (useUUIDSeparators) ? uuid.toString() : uuid.toString().replace("-", "");
 	}
 
 	public @NotNull Collection<Backpack> getLoadedBackpacks()
@@ -238,7 +243,6 @@ public void getBackpack(final OfflinePlayer player, final Callback<at.pcgamingfr
 
 	public void unloadBackpack(Backpack backpack)
 	{
-		plugin.getLogger().log(Level.INFO, "Unloading backpack of {0} ({1})", new Object[] {backpack.getOwner().getName(), backpack.getOwner().getUniqueId()});
 		if (forceSaveOnUnload)
 		{
 			backpack.forceSave();
@@ -247,7 +251,7 @@ public void unloadBackpack(Backpack backpack)
 		{
 			backpack.save();
 		}
-		backpacks.remove(backpack.getOwner().getUniqueId());
+		backpacks.remove(backpack.getOwnerId());
 	}
 
 	public void asyncLoadBackpack(final OfflinePlayer player)

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/Files.java

@@ -30,6 +30,8 @@
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
+import java.util.UUID;
+import java.util.logging.Level;
 import java.util.logging.Logger;
 
 public class Files extends Database
@@ -68,13 +70,13 @@ private void checkFiles()
 		if(allFiles == null) return;
 		for (File file : allFiles)
 		{
-			if(maxAge > 0 && System.currentTimeMillis() - file.lastModified() > maxAge) // Check if the file is older then x days
+			if(maxAge > 0 && System.currentTimeMillis() - file.lastModified() > maxAge) // Check if the file is older than x days
 			{
 				if(!file.delete())
 				{
 					plugin.getLogger().warning("Failed to delete file (" + file.getAbsolutePath() + ").");
 				}
-				continue; // We don't have to check if the file name is correct cause we have the deleted the file
+				continue; // We don't have to check if the file name is correct because we have the deleted the file
 			}
 			int len = file.getName().length() - EXT.length();
 			if(len <= 16) // It's a player name
@@ -110,16 +112,16 @@ private void checkFiles()
 		}
 	}
 	
-	private String getFileName(OfflinePlayer player)
+	private String getFileName(UUID uuid)
 	{
-		return getPlayerFormattedUUID(player) + EXT;
+		return getPlayerFormattedUUID(uuid) + EXT;
 	}
 	
 	// DB Functions
 	@Override
 	public void saveBackpack(Backpack backpack)
 	{
-		File save = new File(saveFolder, getFileName(backpack.getOwner()));
+		File save = new File(saveFolder, getFileName(backpack.getOwnerId()));
 		try(FileOutputStream fos = new FileOutputStream(save))
 		{
 			fos.write(itsSerializer.getUsedSerializer());
@@ -128,7 +130,7 @@ public void saveBackpack(Backpack backpack)
 		}
 		catch(Exception e)
 		{
-			e.printStackTrace();
+			plugin.getLogger().log(Level.SEVERE, "Failed to save backpack.", e);
 		}
 	}
 
@@ -161,7 +163,7 @@ protected void loadBackpack(final OfflinePlayer player, final Callback<Backpack>
 			}
 			catch(Exception e)
 			{
-				e.printStackTrace();
+				logger.log(Level.WARNING, "Failed to read backpack.", e);
 			}
 		}
 		return null;

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/SQL.java

@@ -203,7 +203,7 @@ public void saveBackpack(final Backpack backpack)
 	{
 		final byte[] data = itsSerializer.serialize(backpack.getInventory());
 		final int id = backpack.getOwnerDatabaseId(), usedSerializer = itsSerializer.getUsedSerializer();
-		final String nameOrUUID = getPlayerFormattedUUID(backpack.getOwner()), name = backpack.getOwner().getName();
+		final String nameOrUUID = getPlayerFormattedUUID(backpack.getOwnerId()), name = backpack.getOwner().getName();
 
 		Runnable runnable = () -> {
 			try(Connection connection = getConnection())

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/UnCacheStrategies/Interval.java

@@ -37,7 +37,7 @@ public void run()
 	{
 		for(Backpack backpack : cache.getLoadedBackpacks())
 		{
-			if(!backpack.getOwner().isOnline() && !backpack.isOpen())
+			if(backpack.getOwnerPlayer() == null && !backpack.isOpen())
 			{
 				this.cache.unloadBackpack(backpack);
 			}

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Database/UnCacheStrategies/IntervalChecked.java

@@ -22,6 +22,7 @@
 import at.pcgamingfreaks.Minepacks.Bukkit.Minepacks;
 
 import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
 
 public class IntervalChecked extends UnCacheStrategy implements Runnable
 {
@@ -42,7 +43,8 @@ public void run()
 		long currentTime = System.currentTimeMillis() - delay;
 		for(Backpack backpack : cache.getLoadedBackpacks())
 		{
-			if(!backpack.getOwner().isOnline() && backpack.getOwner().getLastPlayed() < currentTime && !backpack.isOpen())
+			OfflinePlayer owner = backpack.getOwner();
+			if(!owner.isOnline() && owner.getLastPlayed() < currentTime && !backpack.isOpen())
 			{
 				this.cache.unloadBackpack(backpack);
 			}

Minepacks/src/at/pcgamingfreaks/Minepacks/Bukkit/Listener/BackpackEventListener.java

@@ -55,14 +55,13 @@ public void onClose(InventoryCloseEvent event)
 				backpack.save();
 			}
 			backpack.close(closer);
-			if(event.getPlayer().getUniqueId().equals(backpack.getOwner().getUniqueId()))
+			if(event.getPlayer().getUniqueId().equals(backpack.getOwnerId()))
 			{
 				messageOwnBackpackClose.send(closer);
 			}
 			else
 			{
-				OfflinePlayer owner = backpack.getOwner();
+				messageOtherBackpackClose.send(closer, backpack.getOwner());
-				messageOtherBackpackClose.send(closer, owner);
 			}
 			if(closeSound != null)
 			{