Add validation methods to challenge and challengeLevel.

Do not load into local cache invalid data. Add error warnings about it.

src/main/java/world/bentobox/challenges/ChallengesManager.java

@@ -279,6 +279,17 @@ public class ChallengesManager
             return false;
         }
 
+        if (!challenge.isValid())
+        {
+            if (!silent)
+            {
+                user.sendMessage("challenges.errors.invalid-challenge", "[challenge]", challenge.getUniqueId());
+            }
+
+            this.addon.logWarning("Data for challenge `" + challenge.getUniqueId() + "` is not valid. It could be NULL element in item-stack!");
+            return false;
+        }
+
         if (this.challengeCacheData.containsKey(challenge.getUniqueId()))
         {
             if (!overwrite)
@@ -352,6 +363,17 @@ public class ChallengesManager
             return false;
         }
 
+        if (!level.isValid())
+        {
+            if (!silent)
+            {
+                user.sendMessage("challenges.errors.invalid-level", "[level]", level.getUniqueId());
+            }
+
+            this.addon.logWarning("Data for level `" + level.getUniqueId() + "` is not valid. It could be NULL element in item-stack!");
+            return false;
+        }
+
         if (!this.isValidLevel(level))
         {
             if (user != null)

src/main/java/world/bentobox/challenges/database/object/Challenge.java

@@ -1,12 +1,7 @@
 package world.bentobox.challenges.database.object;
 
 
-import java.util.ArrayList;
+import java.util.*;
-import java.util.EnumMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
 import java.util.stream.Collectors;
 
 import org.bukkit.Material;
@@ -18,6 +13,7 @@ import org.eclipse.jdt.annotation.NonNull;
 import com.google.gson.annotations.Expose;
 import com.google.gson.annotations.JsonAdapter;
 
+import world.bentobox.bentobox.BentoBox;
 import world.bentobox.bentobox.database.objects.DataObject;
 import world.bentobox.bentobox.database.objects.Table;
 import world.bentobox.challenges.database.object.adapters.EntityCompatibilityAdapter;
@@ -1104,6 +1100,32 @@ public class Challenge implements DataObject
     }
 
 
+    /**
+     * This method checks if variable values are valid for current level.
+     * @return {@code true} if all object values are valid, {@code false} otherwise.
+     */
+    public boolean isValid()
+    {
+        return this.uniqueId != null &&
+            !this.uniqueId.isEmpty() &&
+            this.friendlyName != null &&
+            this.description != null &&
+            this.icon != null &&
+            this.challengeType != null &&
+            this.environment != null &&
+            this.level != null &&
+
+            this.requirements.isValid() &&
+
+            this.rewardText != null &&
+            this.rewardItems.stream().noneMatch(Objects::isNull) &&
+            this.rewardCommands != null &&
+
+            this.repeatRewardText != null &&
+            this.repeatItemReward.stream().noneMatch(Objects::isNull) &&
+            this.repeatRewardCommands != null;
+    }
+
     /**
      * Clone method that returns clone of current challenge.
      * @return Challenge that is cloned from current object.
@@ -1114,13 +1136,8 @@ public class Challenge implements DataObject
         Challenge clone;
 
         try
-        {
-            clone = (Challenge) super.clone();
-        }
-        catch (CloneNotSupportedException e)
         {
             clone = new Challenge();
-
             clone.setUniqueId(this.uniqueId);
             clone.setFriendlyName(this.friendlyName);
             clone.setDeployed(this.deployed);
@@ -1133,7 +1150,9 @@ public class Challenge implements DataObject
             clone.setRemoveWhenCompleted(this.removeWhenCompleted);
             clone.setRequirements(this.requirements.clone());
             clone.setRewardText(this.rewardText);
-            clone.setRewardItems(this.rewardItems.stream().map(ItemStack::clone).
+            clone.setRewardItems(
+                this.rewardItems.stream().
+                    map(ItemStack::clone).
                     collect(Collectors.toCollection(() -> new ArrayList<>(this.rewardItems.size()))));
             clone.setRewardExperience(this.rewardExperience);
             clone.setRewardMoney(this.rewardMoney);
@@ -1142,11 +1161,20 @@ public class Challenge implements DataObject
             clone.setRepeatRewardText(this.repeatRewardText);
             clone.setMaxTimes(this.maxTimes);
             clone.setRepeatExperienceReward(this.repeatExperienceReward);
-            clone.setRepeatItemReward(this.repeatItemReward.stream().map(ItemStack::clone).
+            clone.setRepeatItemReward(
+                this.repeatItemReward.stream().
+                    map(ItemStack::clone).
                     collect(Collectors.toCollection(() -> new ArrayList<>(this.repeatItemReward.size()))));
             clone.setRepeatMoneyReward(this.repeatMoneyReward);
             clone.setRepeatRewardCommands(new ArrayList<>(this.repeatRewardCommands));
         }
+        catch (Exception e)
+        {
+            BentoBox.getInstance().logError("Failed to clone Challenge " + this.uniqueId);
+            BentoBox.getInstance().logStacktrace(e);
+            clone = this;
+            this.deployed = false;
+        }
 
         return clone;
     }

src/main/java/world/bentobox/challenges/database/object/ChallengeLevel.java

@@ -1,10 +1,7 @@
 package world.bentobox.challenges.database.object;
 
 
-import java.util.ArrayList;
+import java.util.*;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Set;
 import java.util.stream.Collectors;
 
 import org.bukkit.Material;
@@ -12,11 +9,13 @@ import org.bukkit.inventory.ItemStack;
 
 import com.google.gson.annotations.Expose;
 
+import world.bentobox.bentobox.BentoBox;
 import world.bentobox.bentobox.api.configuration.ConfigComment;
 import world.bentobox.bentobox.database.objects.DataObject;
 import world.bentobox.bentobox.database.objects.Table;
 import world.bentobox.challenges.ChallengesManager;
 
+
 /**
  * Represent a challenge level
  * @author tastybento
@@ -520,6 +519,25 @@ public class ChallengeLevel implements DataObject, Comparable<ChallengeLevel>
     }
 
 
+    /**
+     * This method checks if variable values are valid for current level.
+     * @return {@code true} if all object values are valid, {@code false} otherwise.
+     */
+    public boolean isValid()
+    {
+        return this.uniqueId != null &&
+            !this.uniqueId.isEmpty() &&
+            this.friendlyName != null &&
+            this.challenges != null &&
+            this.icon != null &&
+            this.world != null &&
+            this.unlockMessage != null &&
+            this.rewardText != null &&
+            this.rewardItems.stream().noneMatch(Objects::isNull) &&
+            this.rewardCommands != null;
+    }
+
+
     /**
      * Clone method that returns clone of current challengeLevel.
      * @return ChallengeLevel that is cloned from current object.
@@ -527,15 +545,10 @@ public class ChallengeLevel implements DataObject, Comparable<ChallengeLevel>
     @Override
     public ChallengeLevel clone()
     {
-        ChallengeLevel clone;
+        ChallengeLevel clone = new ChallengeLevel();
 
         try
         {
-            clone = (ChallengeLevel) super.clone();
-        }
-        catch (CloneNotSupportedException e)
-        {
-            clone = new ChallengeLevel();
             clone.setUniqueId(this.uniqueId);
             clone.setFriendlyName(this.friendlyName);
             clone.setIcon(this.icon.clone());
@@ -545,12 +558,21 @@ public class ChallengeLevel implements DataObject, Comparable<ChallengeLevel>
             clone.setWaiverAmount(this.waiverAmount);
             clone.setUnlockMessage(this.unlockMessage);
             clone.setRewardText(this.rewardText);
-            clone.setRewardItems(this.rewardItems.stream().map(ItemStack::clone).collect(Collectors.toCollection(() -> new ArrayList<>(this.rewardItems.size()))));
+            clone.setRewardItems(
+                this.rewardItems.stream().
+                    map(ItemStack::clone).
+                    collect(Collectors.toCollection(() -> new ArrayList<>(this.rewardItems.size()))));
             clone.setRewardExperience(this.rewardExperience);
             clone.setRewardMoney(this.rewardMoney);
             clone.setRewardCommands(new ArrayList<>(this.rewardCommands));
             clone.setChallenges(new HashSet<>(this.challenges));
         }
+        catch (Exception e)
+        {
+            BentoBox.getInstance().logError("Failed to clone ChallengeLevel " + this.uniqueId);
+            BentoBox.getInstance().logStacktrace(e);
+            clone = this;
+        }
 
         return clone;
     }

src/main/java/world/bentobox/challenges/database/object/requirements/InventoryRequirements.java

@@ -10,6 +10,7 @@ package world.bentobox.challenges.database.object.requirements;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Collectors;
 
 import org.bukkit.inventory.ItemStack;
@@ -85,6 +86,19 @@ public class InventoryRequirements extends Requirements
 // ---------------------------------------------------------------------
 
 
+	/**
+	 * Method isValid returns if given requirement data is valid or not.
+	 *
+	 * @return {@code true} if data is valid, {@code false} otherwise.
+	 */
+	@Override
+	public boolean isValid()
+	{
+		return super.isValid() &&
+			this.requiredItems != null && this.requiredItems.stream().noneMatch(Objects::isNull);
+	}
+
+
 	/**
 	 * Method Requirements#clone allows to clone Requirements object, to avoid changing content when it is necessary
 	 * to use it.

src/main/java/world/bentobox/challenges/database/object/requirements/IslandRequirements.java

@@ -7,10 +7,7 @@
 package world.bentobox.challenges.database.object.requirements;
 
 
-import java.util.EnumMap;
+import java.util.*;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.Map;
 
 import org.bukkit.Material;
 import org.bukkit.entity.EntityType;
@@ -153,6 +150,20 @@ public class IslandRequirements extends Requirements
 // ---------------------------------------------------------------------
 
 
+	/**
+	 * Method isValid returns if given requirement data is valid or not.
+	 *
+	 * @return {@code true} if data is valid, {@code false} otherwise.
+	 */
+	@Override
+	public boolean isValid()
+	{
+		return super.isValid() &&
+			this.requiredBlocks != null && this.requiredBlocks.keySet().stream().noneMatch(Objects::isNull) &&
+			this.requiredEntities != null && this.requiredEntities.keySet().stream().noneMatch(Objects::isNull);
+	}
+
+
 	/**
 	 * Method Requirements#clone allows to clone Requirements object, to avoid changing content when it is necessary
 	 * to use it.

src/main/java/world/bentobox/challenges/database/object/requirements/Requirements.java

@@ -59,6 +59,16 @@ public abstract class Requirements
 // ---------------------------------------------------------------------
 
 
+	/**
+	 * Method isValid returns if given requirement data is valid or not.
+	 * @return {@code true} if data is valid, {@code false} otherwise.
+	 */
+	public boolean isValid()
+	{
+		return this.requiredPermissions != null;
+	}
+
+
 	/**
 	 * Method Requirements#clone allows to clone Requirements object, to avoid changing content when it is necessary
 	 * to use it.

src/main/java/world/bentobox/challenges/panel/CommonGUI.java

@@ -1006,11 +1006,13 @@ public abstract class CommonGUI
             }
             else if (meta instanceof TropicalFishBucketMeta)
             {
-                result.add(this.user.getTranslation("challenges.gui.item-description.fish-meta",
+                if (((TropicalFishBucketMeta) meta).hasVariant())
+                {
+                    result.add(this.user.getTranslation("challenges.gui.item-description.fish-meta",
                         "[pattern]", Util.prettifyText(((TropicalFishBucketMeta) meta).getPattern().name()),
                         "[pattern-color]", Util.prettifyText(((TropicalFishBucketMeta) meta).getPatternColor().name()),
                         "[body-color]", Util.prettifyText(((TropicalFishBucketMeta) meta).getBodyColor().name())));
-                // parse ne
+                }
             }
 
             if (meta.hasEnchants())

src/main/resources/locales/en-US.yml

@@ -595,6 +595,8 @@ challenges:
         missing-level: '&c Challenge Level [level] is not defined in the database. It may cause errors!'
         missing-arguments: '&c Command is missing arguments.'
         no-multiple-permission: "&c You do not have permission to complete this challenge multiple times at once."
+        invalid-level: "&c Level [level] contains invalid data. It will not be loaded from database!"
+        invalid-challenge: "&c Challenge [challenge] contains invalid data. It will not be loaded from database!"
 protection:
     flags:
         CHALLENGES_ISLAND_PROTECTION: