!Post-load objects refactor

src/main/java/net/Indyuce/mmocore/api/load/PostLoadObject.java

@@ -0,0 +1,27 @@
+package net.Indyuce.mmocore.api.load;
+
+import org.bukkit.configuration.file.FileConfiguration;
+
+public abstract class PostLoadObject {
+	private FileConfiguration config;
+
+	/*
+	 * objects which must load some data afterwards, like quests which must load
+	 * their parent quests after all quests were initialized or classes which
+	 * must load their subclasses
+	 */
+	public PostLoadObject(FileConfiguration config) {
+		this.config = config;
+	}
+
+	public void postLoad() {
+		whenPostLoaded(config);
+
+		/*
+		 * clean config object for garbage collection
+		 */
+		config = null;
+	}
+
+	protected abstract void whenPostLoaded(FileConfiguration config);
+}

src/main/java/net/Indyuce/mmocore/api/player/PlayerData.java

@@ -32,8 +32,8 @@ import net.Indyuce.mmocore.api.event.PlayerRegenResourceEvent;
 import net.Indyuce.mmocore.api.player.attribute.PlayerAttribute;
 import net.Indyuce.mmocore.api.player.attribute.PlayerAttributes;
 import net.Indyuce.mmocore.api.player.profess.PlayerClass;
-import net.Indyuce.mmocore.api.player.profess.PlayerClass.Subclass;
 import net.Indyuce.mmocore.api.player.profess.SavedClassInformation;
+import net.Indyuce.mmocore.api.player.profess.Subclass;
 import net.Indyuce.mmocore.api.player.profess.resource.PlayerResource;
 import net.Indyuce.mmocore.api.player.social.FriendRequest;
 import net.Indyuce.mmocore.api.player.social.Party;

src/main/java/net/Indyuce/mmocore/api/player/profess/ClassOption.java

@@ -0,0 +1,40 @@
+package net.Indyuce.mmocore.api.player.profess;
+
+public enum ClassOption {
+
+	/*
+	 * is class by default
+	 */
+	DEFAULT,
+
+	/*
+	 * displays in the /class GUI
+	 */
+	DISPLAY(true),
+
+	/*
+	 * only regen resource when out of combat
+	 */
+	OFF_COMBAT_HEALTH_REGEN,
+	OFF_COMBAT_MANA_REGEN,
+	OFF_COMBAT_STAMINA_REGEN,
+	OFF_COMBAT_STELLIUM_REGEN;
+
+	private final boolean def;
+
+	private ClassOption() {
+		this(false);
+	}
+
+	private ClassOption(boolean def) {
+		this.def = def;
+	}
+
+	public boolean getDefault() {
+		return def;
+	}
+
+	public String getPath() {
+		return name().toLowerCase().replace("_", "-");
+	}
+}

src/main/java/net/Indyuce/mmocore/api/player/profess/PlayerClass.java

@@ -26,6 +26,7 @@ import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.AltChar;
 import net.Indyuce.mmocore.api.experience.source.type.ExperienceSource;
 import net.Indyuce.mmocore.api.load.MMOLoadException;
+import net.Indyuce.mmocore.api.load.PostLoadObject;
 import net.Indyuce.mmocore.api.player.ExpCurve;
 import net.Indyuce.mmocore.api.player.profess.event.EventTrigger;
 import net.Indyuce.mmocore.api.player.profess.resource.ManaDisplayOptions;
@@ -37,12 +38,11 @@ import net.Indyuce.mmocore.api.skill.Skill.SkillInfo;
 import net.Indyuce.mmocore.api.util.MMOCoreUtils;
 import net.Indyuce.mmocore.api.util.math.formula.LinearValue;
 import net.Indyuce.mmocore.api.util.math.particle.CastingParticle;
-import net.Indyuce.mmocore.manager.ClassManager;
 import net.mmogroup.mmolib.api.MMOLineConfig;
 import net.mmogroup.mmolib.version.VersionMaterial;
 
-public class PlayerClass {
+public class PlayerClass extends PostLoadObject {
-	private final String name, id, fileName;
+	private final String name, id;
 	private final List<String> description = new ArrayList<>(), attrDescription = new ArrayList<>();
 	private final ItemStack icon;
 	private final Map<ClassOption, Boolean> options = new HashMap<>();
@@ -57,21 +57,17 @@ public class PlayerClass {
 	private final Map<PlayerResource, ResourceHandler> resourceHandlers = new HashMap<>();
 	private final Map<String, EventTrigger> eventTriggers = new HashMap<>();
 
-	private CastingParticle castParticle = new CastingParticle(Particle.SPELL_INSTANT);
+	private final CastingParticle castParticle;
-
-	/*
-	 * easy load
-	 */
-	private FileConfiguration loaded;
 
 	public PlayerClass(String id, FileConfiguration config) {
-		this.id = (fileName = id).toUpperCase().replace("-", "_").replace(" ", "_");
+		super(config);
-		this.loaded = config;
+
+		this.id = id.toUpperCase().replace("-", "_").replace(" ", "_");
 
 		name = ChatColor.translateAlternateColorCodes('&', config.getString("display.name"));
 		icon = MMOCoreUtils.readIcon(config.getString("display.item"));
 
-		if (config.contains("display.texture")) {
+		if (config.contains("display.texture"))
 			if (icon.getType() == VersionMaterial.PLAYER_HEAD.toMaterial()) {
 				ItemMeta meta = icon.getItemMeta();
 				try {
@@ -84,10 +80,8 @@ public class PlayerClass {
 					MMOCore.log(Level.WARNING, "[PlayerClasses:" + id + "] Could not apply playerhead texture: " + exception.getMessage());
 				}
 				icon.setItemMeta(meta);
-			} else {
+			} else
 				MMOCore.log(Level.WARNING, "[PlayerClasses:" + id + "] Could not add player head texture. The item is not a playerhead!");
-			}
-		}
 
 		for (String string : config.getStringList("display.lore"))
 			description.add(ChatColor.GRAY + ChatColor.translateAlternateColorCodes('&', string));
@@ -95,7 +89,7 @@ public class PlayerClass {
 			attrDescription.add(ChatColor.GRAY + ChatColor.translateAlternateColorCodes('&', string));
 		manaDisplay = new ManaDisplayOptions(config.getConfigurationSection("mana"));
 		maxLevel = config.getInt("max-level");
-		displayOrder = config.getInt("display-order");
+		displayOrder = config.getInt("display.order");
 
 		expCurve = config.contains("exp-curve")
 				? MMOCore.plugin.experience.getOrThrow(config.get("exp-curve").toString().toLowerCase().replace("_", "-").replace(" ", "-"))
@@ -119,12 +113,8 @@ public class PlayerClass {
 					MMOCore.log(Level.WARNING, "[PlayerClasses:" + id + "] Could not load skill info '" + key + "': " + exception.getMessage());
 				}
 
-		if (config.contains("cast-particle"))
+		castParticle = config.contains("cast-particle") ? new CastingParticle(config.getConfigurationSection("cast-particle"))
-			try {
+				: new CastingParticle(Particle.SPELL_INSTANT);
-				castParticle = new CastingParticle(config.getConfigurationSection("cast-particle"));
-			} catch (IllegalArgumentException exception) {
-				MMOCore.log(Level.WARNING, "[PlayerClasses:" + id + "] Could not read casting particle, using default: " + exception.getMessage());
-			}
 
 		if (config.contains("options"))
 			for (String key : config.getConfigurationSection("options").getKeys(false))
@@ -151,7 +141,6 @@ public class PlayerClass {
 					eventTriggers.put(format, new EventTrigger(format, config.getStringList("triggers." + key)));
 				} catch (IllegalArgumentException exception) {
 					MMOCore.log(Level.WARNING, "[PlayerClasses:" + id + "] " + exception.getMessage());
-					continue;
 				}
 			}
 
@@ -178,13 +167,15 @@ public class PlayerClass {
 	 * used to generate display class
 	 */
 	public PlayerClass(String id, String name, Material material) {
+		super(null);
+
 		this.id = id;
 		this.name = name;
-		this.fileName = id;
 		manaDisplay = new ManaDisplayOptions(ChatColor.BLUE, "Mana", AltChar.listSquare.charAt(0));
 		maxLevel = 0;
 		displayOrder = 0;
 		expCurve = ExpCurve.DEFAULT;
+		castParticle = new CastingParticle(Particle.SPELL_INSTANT);
 
 		this.icon = new ItemStack(material);
 		setOption(ClassOption.DISPLAY, false);
@@ -194,11 +185,12 @@ public class PlayerClass {
 			resourceHandlers.put(resource, new ResourceHandler(resource));
 	}
 
-	public void loadSubclasses(ClassManager manager) {
+	@Override
-		if (loaded.contains("subclasses"))
+	protected void whenPostLoaded(FileConfiguration config) {
-			for (String key : loaded.getConfigurationSection("subclasses").getKeys(false))
+		if (config.contains("subclasses"))
-				subclasses.add(new Subclass(manager.get(key.toUpperCase().replace("-", "_").replace(" ", "_")), loaded.getInt("subclasses." + key)));
+			for (String key : config.getConfigurationSection("subclasses").getKeys(false))
-		loaded = null;
+				subclasses.add(new Subclass(MMOCore.plugin.classManager.get(key.toUpperCase().replace("-", "_").replace(" ", "_")),
+						config.getInt("subclasses." + key)));
 	}
 
 	public String getId() {
@@ -229,10 +221,6 @@ public class PlayerClass {
 		return expCurve;
 	}
 
-	public String getFileName() {
-		return fileName;
-	}
-
 	public ItemStack getIcon() {
 		return icon.clone();
 	}
@@ -305,61 +293,4 @@ public class PlayerClass {
 	public boolean equals(Object obj) {
 		return obj != null && obj instanceof PlayerClass && ((PlayerClass) obj).id.equals(id);
 	}
-
-	public class Subclass {
-		private PlayerClass profess;
-		private int level;
-
-		public Subclass(PlayerClass profess, int level) {
-			this.profess = profess;
-			this.level = level;
-		}
-
-		public PlayerClass getProfess() {
-			return profess;
-		}
-
-		public int getLevel() {
-			return level;
-		}
-	}
-
-	public enum ClassOption {
-
-		/*
-		 * is class by default
-		 */
-		DEFAULT,
-
-		/*
-		 * displays in the /class GUI
-		 */
-		DISPLAY(true),
-
-		/*
-		 * only regen resource when out of combat
-		 */
-		OFF_COMBAT_HEALTH_REGEN,
-		OFF_COMBAT_MANA_REGEN,
-		OFF_COMBAT_STAMINA_REGEN,
-		OFF_COMBAT_STELLIUM_REGEN;
-
-		private final boolean def;
-
-		private ClassOption() {
-			this(false);
-		}
-
-		private ClassOption(boolean def) {
-			this.def = def;
-		}
-
-		public boolean getDefault() {
-			return def;
-		}
-
-		public String getPath() {
-			return name().toLowerCase().replace("_", "-");
-		}
-	}
 }

src/main/java/net/Indyuce/mmocore/api/player/profess/SavedClassInformation.java

@@ -12,7 +12,6 @@ import com.google.gson.JsonObject;
 
 import net.Indyuce.mmocore.api.player.PlayerData;
 import net.Indyuce.mmocore.api.player.attribute.PlayerAttribute;
-import net.Indyuce.mmocore.api.player.profess.PlayerClass.ClassOption;
 import net.Indyuce.mmocore.api.skill.Skill;
 
 public class SavedClassInformation {

src/main/java/net/Indyuce/mmocore/api/player/profess/Subclass.java

@@ -0,0 +1,23 @@
+package net.Indyuce.mmocore.api.player.profess;
+
+import org.apache.commons.lang.Validate;
+
+public class Subclass {
+	private final PlayerClass profess;
+	private final int level;
+
+	public Subclass(PlayerClass profess, int level) {
+		Validate.notNull(profess, "Subclass cannot be null");
+
+		this.profess = profess;
+		this.level = level;
+	}
+
+	public PlayerClass getProfess() {
+		return profess;
+	}
+
+	public int getLevel() {
+		return level;
+	}
+}

src/main/java/net/Indyuce/mmocore/api/player/profess/resource/PlayerResource.java

@@ -6,7 +6,7 @@ import java.util.function.Function;
 import org.bukkit.attribute.Attribute;
 
 import net.Indyuce.mmocore.api.player.PlayerData;
-import net.Indyuce.mmocore.api.player.profess.PlayerClass.ClassOption;
+import net.Indyuce.mmocore.api.player.profess.ClassOption;
 import net.Indyuce.mmocore.api.player.stats.StatType;
 
 public enum PlayerResource {

src/main/java/net/Indyuce/mmocore/api/quest/Quest.java

@@ -14,70 +14,50 @@ import org.bukkit.configuration.file.FileConfiguration;
 import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.experience.Profession;
 import net.Indyuce.mmocore.api.load.MMOLoadException;
+import net.Indyuce.mmocore.api.load.PostLoadObject;
 import net.Indyuce.mmocore.api.player.PlayerData;
 import net.Indyuce.mmocore.api.quest.objective.Objective;
-import net.Indyuce.mmocore.manager.QuestManager;
 import net.mmogroup.mmolib.api.MMOLineConfig;
 
-public class Quest {
+public class Quest extends PostLoadObject {
 	private final String id;
 
-	private String name;
+	private final String name;
-	private List<Quest> parents = new ArrayList<>();
+	private final List<Quest> parents = new ArrayList<>();
-	private List<Objective> objectives = new ArrayList<>();
+	private final List<Objective> objectives = new ArrayList<>();
-	private List<String> lore;
+	private final List<String> lore;
 
-	private int mainLevelRestriction;
+	private final int mainLevelRestriction;
-	private Map<Profession, Integer> levelRestrictions = new HashMap<>();
+	private final Map<Profession, Integer> levelRestrictions = new HashMap<>();
 
 	// cooldown in millis
-	private long cooldown;
+	private final long cooldown;
-
-	/*
-	 * cached to load other info to enable parent quests.
-	 */
-	private FileConfiguration loaded;
 
 	public Quest(String id, FileConfiguration config) {
+		super(config);
+
 		this.id = id.toLowerCase().replace("_", "-").replace(" ", "-");
-		loaded = config;
+		cooldown = (long) (config.contains("delay") ? config.getDouble("delay") * 60 * 60 * 1000 : -1);
-	}
+		name = config.getString("name");
+		lore = config.getStringList("lore");
 
-	/*
+		mainLevelRestriction = config.getInt("level-req.main");
-	 * forced to request a Questmanager instance because the one in the main
-	 * MMOCore class has not been initialized yet, so it can't be accessed using
-	 * MMOCore.plugin.questManager
-	 */
-	public void load(QuestManager manager) {
-		cooldown = (long) (loaded.contains("delay") ? loaded.getDouble("delay") * 60 * 60 * 1000 : -1);
 
-		if (loaded.contains("parent"))
+		if (config.contains("level-req"))
-			for (String parent : loaded.getStringList("parent"))
+			for (String key : config.getConfigurationSection("level-req").getKeys(false))
-				try {
-					parents.add(manager.get(parent));
-				} catch (NullPointerException exception) {
-					MMOCore.plugin.getLogger().log(Level.WARNING, "Couldn't find quest ID '" + parent + "'");
-				}
-
-		name = loaded.getString("name");
-		lore = loaded.getStringList("lore");
-
-		mainLevelRestriction = loaded.getInt("level-req.main");
-
-		if (loaded.contains("level-req"))
-			for (String key : loaded.getConfigurationSection("level-req").getKeys(false))
 				if (!key.equals("main"))
 					try {
-						String id = key.toLowerCase().replace("_", "-");
+						String id1 = key.toLowerCase().replace("_", "-");
-						Validate.isTrue(MMOCore.plugin.professionManager.has(id));
+						Validate.isTrue(MMOCore.plugin.professionManager.has(id1), "Could not find profession called '" + id1 + "'");
-						levelRestrictions.put(MMOCore.plugin.professionManager.get(id), loaded.getInt("level-req." + key));
+						levelRestrictions.put(MMOCore.plugin.professionManager.get(id1), config.getInt("level-req." + key));
 					} catch (IllegalArgumentException exception) {
-						MMOCore.plugin.getLogger().log(Level.WARNING, "[Quests:" + id + "] Couldn't find profession '" + key + "'");
+						MMOCore.plugin.getLogger().log(Level.WARNING,
+								"Could not load level requirement '" + key + "' from quest '" + id + "': " + exception.getMessage());
 					}
 
-		for (String key : loaded.getConfigurationSection("objectives").getKeys(false))
+		for (String key : config.getConfigurationSection("objectives").getKeys(false))
 			try {
-				ConfigurationSection section = loaded.getConfigurationSection("objectives." + key);
+				ConfigurationSection section = config.getConfigurationSection("objectives." + key);
 				Validate.notNull(section, "Could not find config section");
 
 				String format = section.getString("type");
@@ -87,8 +67,17 @@ public class Quest {
 			} catch (MMOLoadException exception) {
 				exception.printConsole("Quests:" + id, "objective");
 			}
+	}
 
-		loaded = null;
+	@Override
+	protected void whenPostLoaded(FileConfiguration config) {
+		if (config.contains("parent"))
+			for (String parent : config.getStringList("parent"))
+				try {
+					parents.add(MMOCore.plugin.questManager.get(parent));
+				} catch (NullPointerException exception) {
+					MMOCore.plugin.getLogger().log(Level.WARNING, "Couldn't find quest ID '" + parent + "'");
+				}
 	}
 
 	public String getId() {

src/main/java/net/Indyuce/mmocore/api/util/MMOCoreUtils.java

@@ -55,16 +55,12 @@ public class MMOCoreUtils {
 		return material == VersionMaterial.PLAYER_HEAD.toMaterial() || material == VersionMaterial.PLAYER_WALL_HEAD.toMaterial();
 	}
 
-	public static ItemStack readIcon(String string) {
+	public static ItemStack readIcon(String string) throws IllegalArgumentException {
-		try {
+		Validate.notNull(string, "String cannot be null");
-			Validate.notNull(string, "String cannot be null");
+
-			String[] split = string.split("\\:");
+		String[] split = string.split("\\:");
-			Material material = Material.valueOf(split[0].toUpperCase().replace("-", "_").replace(" ", "_"));
+		Material material = Material.valueOf(split[0].toUpperCase().replace("-", "_").replace(" ", "_"));
-			return split.length > 1 ? MMOLib.plugin.getVersion().getWrapper().textureItem(material, Integer.parseInt(split[1]))
+		return split.length > 1 ? MMOLib.plugin.getVersion().getWrapper().textureItem(material, Integer.parseInt(split[1])) : new ItemStack(material);
-					: new ItemStack(material);
-		} catch (IllegalArgumentException exception) {
-			return new ItemStack(Material.BARRIER);
-		}
 	}
 
 	public static int getWorth(ItemStack[] items) {

src/main/java/net/Indyuce/mmocore/gui/ClassSelect.java

@@ -17,8 +17,8 @@ import org.bukkit.inventory.meta.ItemMeta;
 import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.ConfigMessage;
 import net.Indyuce.mmocore.api.player.PlayerData;
+import net.Indyuce.mmocore.api.player.profess.ClassOption;
 import net.Indyuce.mmocore.api.player.profess.PlayerClass;
-import net.Indyuce.mmocore.api.player.profess.PlayerClass.ClassOption;
 import net.Indyuce.mmocore.gui.api.EditableInventory;
 import net.Indyuce.mmocore.gui.api.GeneratedInventory;
 import net.Indyuce.mmocore.gui.api.item.InventoryItem;

src/main/java/net/Indyuce/mmocore/gui/SubclassSelect.java

@@ -15,7 +15,7 @@ import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.ConfigMessage;
 import net.Indyuce.mmocore.api.player.PlayerData;
 import net.Indyuce.mmocore.api.player.profess.PlayerClass;
-import net.Indyuce.mmocore.api.player.profess.PlayerClass.Subclass;
+import net.Indyuce.mmocore.api.player.profess.Subclass;
 import net.Indyuce.mmocore.gui.api.EditableInventory;
 import net.Indyuce.mmocore.gui.api.GeneratedInventory;
 import net.Indyuce.mmocore.gui.api.item.InventoryItem;
@@ -61,6 +61,8 @@ public class SubclassSelect extends EditableInventory {
 				return null;
 
 			PlayerClass profess = generated.subclasses.get(n).getProfess();
+			
+			
 			ItemStack item = profess.getIcon();
 			ItemMeta meta = item.getItemMeta();
 			meta.setDisplayName(ChatColor.translateAlternateColorCodes('&', name).replace("{name}", profess.getName()));
@@ -97,7 +99,8 @@ public class SubclassSelect extends EditableInventory {
 		public SubclassSelectionInventory(PlayerData playerData, EditableInventory editable) {
 			super(playerData, editable);
 
-			subclasses = playerData.getProfess().getSubclasses().stream().filter(sub -> playerData.getLevel() >= sub.getLevel()).collect(Collectors.toList());
+			subclasses = playerData.getProfess().getSubclasses().stream().filter(sub -> playerData.getLevel() >= sub.getLevel())
+					.collect(Collectors.toList());
 		}
 
 		@Override

src/main/java/net/Indyuce/mmocore/manager/ClassManager.java

@@ -15,8 +15,8 @@ import org.bukkit.event.HandlerList;
 
 import net.Indyuce.mmocore.MMOCore;
 import net.Indyuce.mmocore.api.player.PlayerData;
+import net.Indyuce.mmocore.api.player.profess.ClassOption;
 import net.Indyuce.mmocore.api.player.profess.PlayerClass;
-import net.Indyuce.mmocore.api.player.profess.PlayerClass.ClassOption;
 import net.Indyuce.mmocore.api.player.profess.event.EventTriggerHandler;
 import net.Indyuce.mmocore.api.player.profess.event.trigger.AttackEventTrigger;
 import net.Indyuce.mmocore.api.player.profess.event.trigger.BlockBrokenTrigger;
@@ -82,11 +82,18 @@ public class ClassManager extends MMOManager {
 				String id = file.getName().substring(0, file.getName().length() - 4);
 				register(new PlayerClass(id, YamlConfiguration.loadConfiguration(file)));
 			} catch (IllegalArgumentException exception) {
-				MMOCore.plugin.getLogger().log(Level.WARNING, "Could not load class " + file.getName() + ": " + exception.getMessage());
+				MMOCore.plugin.getLogger().log(Level.WARNING, "Could not load class '" + file.getName() + "': " + exception.getMessage());
 			}
 
-		map.values().forEach(profess -> profess.loadSubclasses(this));
+		for (PlayerClass profess : map.values())
-		defaultClass = map.values().stream().filter(profess -> profess.hasOption(ClassOption.DEFAULT)).findFirst().orElse(new PlayerClass("HUMAN", "Human", Material.LEATHER_BOOTS));
+			try {
+				profess.postLoad();
+			} catch (IllegalArgumentException exception) {
+				MMOCore.plugin.getLogger().log(Level.WARNING, "Could not post-load class '" + profess.getId() + "': " + exception.getMessage());
+			}
+
+		defaultClass = map.values().stream().filter(profess -> profess.hasOption(ClassOption.DEFAULT)).findFirst()
+				.orElse(new PlayerClass("HUMAN", "Human", Material.LEATHER_BOOTS));
 
 		/*
 		 * register event triggers

src/main/java/net/Indyuce/mmocore/manager/CustomBlockManager.java

@@ -5,6 +5,7 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.function.Function;
 import java.util.logging.Level;
@@ -44,15 +45,16 @@ public class CustomBlockManager extends MMOManager {
 	private final List<Condition> customMineConditions = new ArrayList<>();
 
 	/*
-	 * list of functions which let
+	 * list of functions which let MMOCore recognize what block a player is
+	 * currently breaking
 	 */
-	private final List<Function<Block, BlockType>> blockTypes = new ArrayList<>();
+	private final List<Function<Block, Optional<BlockType>>> blockTypes = new ArrayList<>();
 
 	public CustomBlockManager() {
-		registerBlockType(block -> MMOCoreUtils.isPlayerHead(block.getType()) ? new SkullBlockType(block) : null);
+		registerBlockType(block -> MMOCoreUtils.isPlayerHead(block.getType()) ? Optional.of(new SkullBlockType(block)) : Optional.empty());
 	}
 
-	public void registerBlockType(Function<Block, BlockType> function) {
+	public void registerBlockType(Function<Block, Optional<BlockType>> function) {
 		blockTypes.add(function);
 	}
 
@@ -65,10 +67,10 @@ public class CustomBlockManager extends MMOManager {
 	}
 
 	public BlockType findBlockType(Block block) {
-		for (Function<Block, BlockType> blockType : blockTypes) {
+		for (Function<Block, Optional<BlockType>> blockType : blockTypes) {
-			BlockType type = blockType.apply(block);
+			Optional<BlockType> type = blockType.apply(block);
-			if (type != null)
+			if (type.isPresent())
-				return type;
+				return type.get();
 		}
 
 		return new VanillaBlockType(block);

src/main/java/net/Indyuce/mmocore/manager/QuestManager.java

@@ -6,6 +6,7 @@ import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.logging.Level;
 
+import org.apache.commons.lang.Validate;
 import org.bukkit.configuration.file.YamlConfiguration;
 
 import net.Indyuce.mmocore.MMOCore;
@@ -34,6 +35,11 @@ public class QuestManager extends MMOManager {
 		return quests.get(id);
 	}
 
+	public Quest getOrThrow(String id) {
+		Validate.isTrue(quests.containsKey(id), "Could not find quest with ID '" + id + "'");
+		return get(id);
+	}
+
 	public Collection<Quest> getAll() {
 		return quests.values();
 	}
@@ -41,7 +47,12 @@ public class QuestManager extends MMOManager {
 	@Override
 	public void reload() {
 		load(new File(MMOCore.plugin.getDataFolder() + "/quests"));
-		quests.values().forEach(quest -> quest.load(this));
+		for (Quest quest : quests.values())
+			try {
+				quest.postLoad();
+			} catch (IllegalArgumentException exception) {
+				MMOCore.plugin.getLogger().log(Level.WARNING, "Could not post-load quest '" + quest.getId() + "' :" + exception.getMessage());
+			}
 	}
 
 	@Override