diff --git a/src/main/java/net/Indyuce/mmocore/api/experience/PlayerProfessions.java b/src/main/java/net/Indyuce/mmocore/api/experience/PlayerProfessions.java
index ebe98084..81e4d533 100644
--- a/src/main/java/net/Indyuce/mmocore/api/experience/PlayerProfessions.java
+++ b/src/main/java/net/Indyuce/mmocore/api/experience/PlayerProfessions.java
@@ -114,7 +114,7 @@ public class PlayerProfessions {
 	}
 
 	public boolean hasReachedMaxLevel(Profession profession) {
-		return profession.getMaxLevel() > 0 && getLevel(profession) >= profession.getMaxLevel();
+		return profession.hasMaxLevel() && getLevel(profession) >= profession.getMaxLevel();
 	}
 
 	public void giveExperience(Profession profession, int value, Location loc) {
diff --git a/src/main/java/net/Indyuce/mmocore/api/experience/Profession.java b/src/main/java/net/Indyuce/mmocore/api/experience/Profession.java
index fbf949b0..46317d6f 100644
--- a/src/main/java/net/Indyuce/mmocore/api/experience/Profession.java
+++ b/src/main/java/net/Indyuce/mmocore/api/experience/Profession.java
@@ -35,21 +35,21 @@ public class Profession extends PostLoadObject {
 		Validate.notNull(name, "Could not load name");
 
 		expCurve = config.contains("exp-curve")
-				? MMOCore.plugin.experience.getOrThrow(config.get("exp-curve").toString().toLowerCase().replace("_", "-").replace(" ", "-"))
+				? MMOCore.plugin.experience.getOrThrow(
+						config.get("exp-curve").toString().toLowerCase().replace("_", "-").replace(" ", "-"))
 				: ExpCurve.DEFAULT;
 		experience = new LinearValue(config.getConfigurationSection("experience"));
 
-		maxLevel = config.contains("max-level")
-				? config.getInt("max-level")
-				: -1;
+		maxLevel = config.getInt("max-level");
 
 		if (config.contains("exp-sources"))
 			for (String key : config.getStringList("exp-sources"))
 				try {
-					MMOCore.plugin.professionManager.registerExpSource(MMOCore.plugin.loadManager.loadExperienceSource(new MMOLineConfig(key), this));
+					MMOCore.plugin.professionManager.registerExpSource(
+							MMOCore.plugin.loadManager.loadExperienceSource(new MMOLineConfig(key), this));
 				} catch (IllegalArgumentException exception) {
-					MMOCore.plugin.getLogger().log(Level.WARNING,
-							"Could not register exp source '" + key + "' from profession '" + id + "': " + exception.getMessage());
+					MMOCore.plugin.getLogger().log(Level.WARNING, "Could not register exp source '" + key
+							+ "' from profession '" + id + "': " + exception.getMessage());
 				}
 	}
 
@@ -68,14 +68,16 @@ public class Profession extends PostLoadObject {
 		if (config.contains("alchemy-experience")) {
 
 			MMOCore.plugin.alchemyManager.splash = 1 + config.getDouble("alchemy-experience.special.splash") / 100;
-			MMOCore.plugin.alchemyManager.lingering = 1 + config.getDouble("alchemy-experience.special.lingering") / 100;
+			MMOCore.plugin.alchemyManager.lingering = 1
+					+ config.getDouble("alchemy-experience.special.lingering") / 100;
 			MMOCore.plugin.alchemyManager.extend = 1 + config.getDouble("alchemy-experience.special.extend") / 100;
 			MMOCore.plugin.alchemyManager.upgrade = 1 + config.getDouble("alchemy-experience.special.upgrade") / 100;
 
 			for (String key : config.getConfigurationSection("alchemy-experience.effects").getKeys(false))
 				try {
 					PotionType type = PotionType.valueOf(key.toUpperCase().replace("-", "_").replace(" ", "_"));
-					MMOCore.plugin.alchemyManager.registerBaseExperience(type, config.getDouble("alchemy-experience.effects." + key));
+					MMOCore.plugin.alchemyManager.registerBaseExperience(type,
+							config.getDouble("alchemy-experience.effects." + key));
 				} catch (IllegalArgumentException exception) {
 					MMOCore.log(Level.WARNING, "[PlayerProfessions:" + id + "] Could not read potion type from " + key);
 				}
@@ -84,8 +86,10 @@ public class Profession extends PostLoadObject {
 		if (config.contains("base-enchant-exp"))
 			for (String key : config.getConfigurationSection("base-enchant-exp").getKeys(false))
 				try {
-					Enchantment enchant = MMOLib.plugin.getVersion().getWrapper().getEnchantmentFromString(key.toLowerCase().replace("-", "_"));
-					MMOCore.plugin.enchantManager.registerBaseExperience(enchant, config.getDouble("base-enchant-exp." + key));
+					Enchantment enchant = MMOLib.plugin.getVersion().getWrapper()
+							.getEnchantmentFromString(key.toLowerCase().replace("-", "_"));
+					MMOCore.plugin.enchantManager.registerBaseExperience(enchant,
+							config.getDouble("base-enchant-exp." + key));
 				} catch (IllegalArgumentException exception) {
 					MMOCore.log(Level.WARNING, "[PlayerProfessions:" + id + "] Could not read enchant from " + key);
 				}
@@ -94,7 +98,8 @@ public class Profession extends PostLoadObject {
 			for (String key : config.getConfigurationSection("repair-exp").getKeys(false))
 				try {
 					Material material = Material.valueOf(key.toUpperCase().replace("-", "_").replace(" ", "_"));
-					MMOCore.plugin.smithingManager.registerBaseExperience(material, config.getDouble("repair-exp." + key));
+					MMOCore.plugin.smithingManager.registerBaseExperience(material,
+							config.getDouble("repair-exp." + key));
 				} catch (IllegalArgumentException exception) {
 					MMOCore.log(Level.WARNING, "[PlayerProfessions:" + id + "] Could not read material from " + key);
 				}
@@ -128,6 +133,10 @@ public class Profession extends PostLoadObject {
 		return maxLevel;
 	}
 
+	public boolean hasMaxLevel() {
+		return maxLevel > 0;
+	}
+
 	public int calculateExperience(int x) {
 		return (int) experience.calculate(x);
 	}
diff --git a/src/main/java/net/Indyuce/mmocore/manager/QuestManager.java b/src/main/java/net/Indyuce/mmocore/manager/QuestManager.java
index c371e0f8..3bce6953 100644
--- a/src/main/java/net/Indyuce/mmocore/manager/QuestManager.java
+++ b/src/main/java/net/Indyuce/mmocore/manager/QuestManager.java
@@ -1,6 +1,7 @@
 package net.Indyuce.mmocore.manager;
 
 import java.io.File;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.LinkedHashMap;
 import java.util.Map;
@@ -14,11 +15,10 @@ import net.Indyuce.mmocore.api.quest.Quest;
 
 public class QuestManager extends MMOManager {
 	private final Map<String, Quest> quests = new LinkedHashMap<>();
-
+	
 	public void load(File file) {
 		if (file.isDirectory())
-			for (File subfile : file.listFiles())
-				load(subfile);
+			Arrays.asList(file.listFiles()).stream().sorted().forEach(subfile -> load(subfile));
 		else
 			try {
 				register(new Quest(file.getName().substring(0, file.getName().length() - 4), YamlConfiguration.loadConfiguration(file)));
diff --git a/src/main/java/net/Indyuce/mmocore/manager/SkillManager.java b/src/main/java/net/Indyuce/mmocore/manager/SkillManager.java
index d7ed9396..02748fc8 100644
--- a/src/main/java/net/Indyuce/mmocore/manager/SkillManager.java
+++ b/src/main/java/net/Indyuce/mmocore/manager/SkillManager.java
@@ -33,11 +33,14 @@ public class SkillManager {
 
 		if (skills.isEmpty())
 			try {
+				JarFile jarFile = new JarFile(MMOCore.plugin.getJarFile());
 				JarEntry entry;
-				for (Enumeration<JarEntry> en = new JarFile(MMOCore.plugin.getJarFile()).entries(); en.hasMoreElements();)
-					if ((entry = en.nextElement()).getName().startsWith("net/Indyuce/mmocore/skill/") && !entry.isDirectory()
-							&& !entry.getName().contains("$"))
-						register((Skill) Class.forName(entry.getName().replace("/", ".").replace(".class", "")).newInstance());
+				for (Enumeration<JarEntry> en = jarFile.entries(); en.hasMoreElements();)
+					if ((entry = en.nextElement()).getName().startsWith("net/Indyuce/mmocore/skill/")
+							&& !entry.isDirectory() && !entry.getName().contains("$"))
+						register((Skill) Class.forName(entry.getName().replace("/", ".").replace(".class", ""))
+								.newInstance());
+				jarFile.close();
 			} catch (IOException | InstantiationException | IllegalAccessException | ClassNotFoundException exception) {
 				exception.printStackTrace();
 				MMOCore.log(Level.WARNING, "Could not load skills! Careful with player data :(");