Solved UUID problem in ConfigurationSerializable?

Hello,
I solved that problem by converting the list of uuids into a list of strings, but not im getting another error.
If i do /dog , it will create and save my dog in the config, then if i do /reload it will work without errors, and then if i do again /reload it will throw an error. This is bad because, if i try to add a dog to my list of dogs using /add-dog it wont be saved into the config unless i do this before the first /relaod, cuz then it will keep throwing me an error on console and i wont be able to store any more data (Problem is with serialize).

Dog

Code:

package me.gonmarte;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import org.bukkit.configuration.serialization.ConfigurationSerializable;

public class Dog implements ConfigurationSerializable{
  
    public int age;
    public String name;
    public ArrayList<UUID> dogs;
  
    public Dog(String name, int age){
        this.dogs = new ArrayList<>();
        this.name=name;
        this.age = age;
        dogs.add(UUID.randomUUID());
    }
  
    @SuppressWarnings("unchecked")
    public Dog(Map<String, Object> map){
        this.age = (int) map.get("age");
        this.name = (String) map.get("name");
        this.dogs = (ArrayList<UUID>) map.get("dogs");
    }

    @Override
    public Map<String, Object> serialize() {
        Map<String, Object> map = new HashMap<>();
        map.put("age", this.age);
        map.put("name", this.name);
        map.put("dogs", toStringList());
        return map;
    }
  
    public ArrayList<String> toStringList(){
        ArrayList<String> list = new ArrayList<>();
        for(UUID uuid : dogs){
            list.add(uuid.toString());
        }
        return list;
    }
}

Main

Code:

package me.gonmarte;

import java.io.*;
import java.util.UUID;

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.configuration.InvalidConfigurationException;
import org.bukkit.configuration.file.YamlConfiguration;
import org.bukkit.configuration.serialization.ConfigurationSerialization;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin{
        
    public File ClansData = new File("plugins/" + File.separator + "Clans", "ClansData.yml");
    public YamlConfiguration cd;
    @Override
    public void onEnable() {
        ConfigurationSerialization.registerClass(Dog.class);
        cd = YamlConfiguration.loadConfiguration(ClansData);
        loadFiles();
    }
  
    @Override
    public void onDisable() {
        saveFiles();
    }
  
  
    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if(command.getName().equalsIgnoreCase("dog")){
            Dog myDog = new Dog("Billy" , 15);
            cd.set("dog", myDog);
            return true;
}else if(command.getName().equalsIgnoreCase("add-dog")){
    Dog dog = (Dog) cd.get("dog");
    dog.dogs.add(UUID.randomUUID());
    return true;
      
    }else if(command.getName().equalsIgnoreCase("mydog")){
    Dog dog = (Dog) cd.get("dog");
    sender.sendMessage(dog.name + dog.age + dog.dogs);
}
        return false;
}
  
  public void saveFiles() {
  try {
    this.cd.save(this.ClansData);
  } catch (IOException e) {
    e.printStackTrace();
  
  }
}

public void loadFiles() {
  if (this.ClansData.exists())
    try {
      
      this.cd.load(this.ClansData);
    
    }catch(IOException e){
       e.printStackTrace();
    
    } catch (InvalidConfigurationException e) {
        e.printStackTrace();
    }else{
  
       try {
    
           this.cd.save(this.ClansData);
  
       } catch (IOException e) {
    
           e.printStackTrace();
    }
    }

}
}

Error:

Code:

java.lang.ClassCastException : java.lang.String cannot be cast to java.util.UUID
    at me.gonmarte.Dog.toStringList(Dog.java:41)
    at me.gonmarte.Dog.serialize(Dog.java:35)

@I Al Istannen

 

A few things here;

1. Where do you call this serialize and deserialize code?
2. Are any errors being produced?
3. How do you deserialize the data?

 

Thats what he wants to know xD

 

OP made that super unclear lol

 

Exactly xD

I solved it, but now im getting another problem

 

@Gonmarte
Well, for saving I would create a new List<String> and save all the UUIDs in there and save the List<String>. For deserializing cast it to a List<String> again and do it backwards. So you create a List<UUID> and then add all the UUID.fromString() to it. You can use your "dogs" list instad of creating a new List<UUID> if you want.

Code:

Create List<String> stringList
For UUID in uuidList
  add to stringList
End for
save stringList

Code:

List<String> stringList = savedList
For String in stringList
  add UUID.fromString(String) to dogs list
End for

 

Very smart you are xD I had the same idea and i did, but i get an error, take a look at the main post, i will be adding the console error.
Thanks.
EDIT: @I Al Istannen You have everything that you need in main post. Ty

 

@Gonmarte
Are you sure the code for the Dog class is right? It says the error is here:

Code:

        for(UUID uuid : dogs){
            list.add(uuid.toString());
        }

but you never cast there and any error should be pointed out by your IDE, as they won't just occur at runtime.

 

Yes, and also it points me.gonmarte.saveFiles(line 50)
me.gonmarte.onDisable(line 26)

Code:

>reload
16:00:06 [INFO] [Test] Disabling Test v1.0
16:00:06 [INFO] 229 recipes
16:00:06 [INFO] [Test] Loading Test v1.0
16:00:06 [INFO] [Test] Enabling Test v1.0
16:00:06 [INFO] Server permissions file permissions.yml is empty, ignoring it
16:00:06 [INFO] CONSOLE: Reload complete.
>reload
16:00:08 [INFO] [Test] Disabling Test v1.0
16:00:08 [SEVERE] Error occurred while disabling Test v1.0 (Is it up to date?)
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.UUID
        at me.gonmarte.Dog.toStringList(Dog.java:46)
        at me.gonmarte.Dog.serialize(Dog.java:35)
        at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationS
erializable.representData(YamlRepresenter.java:33)
        at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepr
esenter.java:96)
        at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseR
epresenter.java:164)
        at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.represent
Data(SafeRepresenter.java:201)
        at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepr
esenter.java:96)
        at org.yaml.snakeyaml.representer.BaseRepresenter.represent(BaseRepresen
ter.java:66)
        at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:270)
        at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:261)
        at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:233)
        at org.yaml.snakeyaml.Yaml.dump(Yaml.java:209)
        at org.bukkit.configuration.file.YamlConfiguration.saveToString(YamlConf
iguration.java:38)
        at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguratio
n.java:54)
        at me.gonmarte.Main.saveFiles(Main.java:50)
        at me.gonmarte.Main.onDisable(Main.java:26)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:219)
        at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoade
r.java:481)
        at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManag
er.java:400)
        at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginMana
ger.java:393)
        at org.bukkit.plugin.SimplePluginManager.clearPlugins(SimplePluginManage
r.java:434)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.reload(CraftServer.java:57
5)
        at org.bukkit.Bukkit.reload(Bukkit.java:185)
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
23)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
9)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServe
r.java:523)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchServerCommand(Craf
tServer.java:512)
        at net.minecraft.server.v1_5_R3.DedicatedServer.an(DedicatedServer.java:
262)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:2
27)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:4
77)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java
:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:5
73)
16:00:08 [INFO] 229 recipes

@I Al Istannen

 

@Gonmarte
I copy-pasted your Dog class and it worked. Which is slightly strange. Have you tried stopping the server, deleting the whole config file and then restarting?

 

Ik it works, but if you do /reload two times, at the second time and it will throw that error.

Code:

>reload
16:00:06 [INFO] [Test] Disabling Test v1.0
16:00:06 [INFO] 229 recipes
16:00:06 [INFO] [Test] Loading Test v1.0
16:00:06 [INFO] [Test] Enabling Test v1.0
16:00:06 [INFO] Server permissions file permissions.yml is empty, ignoring it
16:00:06 [INFO] CONSOLE: Reload complete.
>reload
16:00:08 [INFO] [Test] Disabling Test v1.0
16:00:08 [SEVERE] Error occurred while disabling Test v1.0 (Is it up to date?)
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.UUID
        at me.gonmarte.Dog.toStringList(Dog.java:46)
        at me.gonmarte.Dog.serialize(Dog.java:35)
        at org.bukkit.configuration.file.YamlRepresenter$RepresentConfigurationS
erializable.representData(YamlRepresenter.java:33)
        at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepr
esenter.java:96)
        at org.yaml.snakeyaml.representer.BaseRepresenter.representMapping(BaseR
epresenter.java:164)
        at org.yaml.snakeyaml.representer.SafeRepresenter$RepresentMap.represent
Data(SafeRepresenter.java:201)
        at org.yaml.snakeyaml.representer.BaseRepresenter.representData(BaseRepr
esenter.java:96)
        at org.yaml.snakeyaml.representer.BaseRepresenter.represent(BaseRepresen
ter.java:66)
        at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:270)
        at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:261)
        at org.yaml.snakeyaml.Yaml.dumpAll(Yaml.java:233)
        at org.yaml.snakeyaml.Yaml.dump(Yaml.java:209)
        at org.bukkit.configuration.file.YamlConfiguration.saveToString(YamlConf
iguration.java:38)
        at org.bukkit.configuration.file.FileConfiguration.save(FileConfiguratio
n.java:54)
        at me.gonmarte.Main.saveFiles(Main.java:50)
        at me.gonmarte.Main.onDisable(Main.java:26)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:219)
        at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoade
r.java:481)
        at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManag
er.java:400)
        at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginMana
ger.java:393)
        at org.bukkit.plugin.SimplePluginManager.clearPlugins(SimplePluginManage
r.java:434)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.reload(CraftServer.java:57
5)
        at org.bukkit.Bukkit.reload(Bukkit.java:185)
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
23)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
9)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServe
r.java:523)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchServerCommand(Craf
tServer.java:512)
        at net.minecraft.server.v1_5_R3.DedicatedServer.an(DedicatedServer.java:
262)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:2
27)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:4
77)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java
:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:5
73)
16:00:08 [INFO] 229 recipes

 

@Gonmarte
Not for me. But I would have done the deserialization different, as you can see here. Very Surprised the cast works there:

EDIT: The error is on serializing. This is extremly odd. Are you sure you have the right class file on the server?

 

What you mean?
Did you copy and paste both of my classes? Did you do /dog and then /reload two times? Im sure second time you get an error.

 

@Gonmarte
No, I just copied the Dog class. Nothing seems to be wrong with it.

Again, I really can't see where this error should happen. Are you absolutly sure you exported it again and overwrote the old file?

 

Yess. Copy both classes and test it and you will see

 

@Gonmarte
Ok, I see it. I will look into it.

EDIT:
Easy fix. If you would have listened to what I said and implemented it the way my pseudo code showed, all would be good. Not trying to be mean though
The error is here:
"dogs = (ArrayList<UUID>) map.get("dogs");"
Well that iussed a UncheckedWarning that was totally right in this case. You saved it as a LIST<STRING> and casted it to a LIST<UUID>. Guess, what went wrong. Exactly, the dogs list was a List<String>, despite being declared as <UUID>. The fix is following the pseudocode I wrote.

Code:

dogs = new List
List<String> stringList = map.get("dogs");
For String in stringList
  dogs.add( UUID.from String)
End For

 

Another error.

Code:

   
17:01:56 [SEVERE] Could not call constructor 'public me.gonmarte.Dog(java.util.M
ap)' of class me.gonmarte.Dog for deserialization
java.lang.NullPointerException
        at me.gonmarte.Dog.<init>(Dog.java:29)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at org.bukkit.configuration.serialization.ConfigurationSerialization.des
erializeViaCtor(ConfigurationSerialization.java:92)
        at org.bukkit.configuration.serialization.ConfigurationSerialization.des
erialize(ConfigurationSerialization.java:129)
        at org.bukkit.configuration.serialization.ConfigurationSerialization.des
erializeObject(ConfigurationSerialization.java:187)
        at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.c
onstruct(YamlConstructor.java:35)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseCo
nstructor.java:183)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndSte
p(BaseConstructor.java:326)
        at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndSte
p(SafeConstructor.java:143)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseC
onstructor.java:307)
        at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.const
ruct(SafeConstructor.java:459)
        at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.c
onstruct(YamlConstructor.java:26)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseCo
nstructor.java:183)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(Base
Constructor.java:142)
        at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseCons
tructor.java:128)
        at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:480)
        at org.yaml.snakeyaml.Yaml.load(Yaml.java:399)
        at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlCo
nfiguration.java:53)
        at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguratio
n.java:138)
        at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguratio
n.java:105)
        at org.bukkit.configuration.file.YamlConfiguration.loadConfiguration(Yam
lConfiguration.java:175)
        at me.gonmarte.Main.onEnable(Main.java:20)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:457)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.loadPlugin(CraftServer.jav
a:282)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.enablePlugins(CraftServer.
java:264)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.reload(CraftServer.java:60
5)
        at org.bukkit.Bukkit.reload(Bukkit.java:185)
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
23)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
9)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServe
r.java:523)
        at net.minecraft.server.v1_5_R3.PlayerConnection.handleCommand(PlayerCon
nection.java:965)
        at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.j
ava:883)
        at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java
:840)
        at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292
)
        at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java
:109)
        at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:3
0)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:5
81)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:2
26)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:4
77)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java
:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:5
73)
17:01:57 [SEVERE] Could not call constructor 'public me.gonmarte.Dog(java.util.M
ap)' of class me.gonmarte.Dog for deserialization
java.lang.NullPointerException
        at me.gonmarte.Dog.<init>(Dog.java:29)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at org.bukkit.configuration.serialization.ConfigurationSerialization.des
erializeViaCtor(ConfigurationSerialization.java:92)
        at org.bukkit.configuration.serialization.ConfigurationSerialization.des
erialize(ConfigurationSerialization.java:129)
        at org.bukkit.configuration.serialization.ConfigurationSerialization.des
erializeObject(ConfigurationSerialization.java:187)
        at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.c
onstruct(YamlConstructor.java:35)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseCo
nstructor.java:183)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping2ndSte
p(BaseConstructor.java:326)
        at org.yaml.snakeyaml.constructor.SafeConstructor.constructMapping2ndSte
p(SafeConstructor.java:143)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructMapping(BaseC
onstructor.java:307)
        at org.yaml.snakeyaml.constructor.SafeConstructor$ConstructYamlMap.const
ruct(SafeConstructor.java:459)
        at org.bukkit.configuration.file.YamlConstructor$ConstructCustomObject.c
onstruct(YamlConstructor.java:26)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseCo
nstructor.java:183)
        at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(Base
Constructor.java:142)
        at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseCons
tructor.java:128)
        at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:480)
        at org.yaml.snakeyaml.Yaml.load(Yaml.java:399)
        at org.bukkit.configuration.file.YamlConfiguration.loadFromString(YamlCo
nfiguration.java:53)
        at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguratio
n.java:138)
        at org.bukkit.configuration.file.FileConfiguration.load(FileConfiguratio
n.java:105)
        at me.gonmarte.Main.loadFiles(Main.java:61)
        at me.gonmarte.Main.onEnable(Main.java:21)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:457)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.loadPlugin(CraftServer.jav
a:282)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.enablePlugins(CraftServer.
java:264)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.reload(CraftServer.java:60
5)
        at org.bukkit.Bukkit.reload(Bukkit.java:185)
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:
23)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
9)
        at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServe
r.java:523)
        at net.minecraft.server.v1_5_R3.PlayerConnection.handleCommand(PlayerCon
nection.java:965)
        at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.j
ava:883)
        at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java
:840)
        at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292
)
        at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java
:109)
        at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
        at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:3
0)
        at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:5
81)
        at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:2
26)
        at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:4
77)
        at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java
:410)
        at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:5
73)
17:01:57 [INFO] Server permissions file permissions.yml is empty, ignoring it
17:01:57 [INFO] gonmarte0334: Reload complete.
  

I think solve this

Code:

    public Dog(Map<String, Object> map){
        this.age = (int) map.get("age");
        this.name = (String) map.get("name");
       //ADD THIS
        dogs = new ArrayList<>();
        ArrayList<String> stringList = (ArrayList<String>) map.get("dogs");
        for(String str : stringList){
            dogs.add(UUID.fromString(str));
        }
    }

It is all fine now?
Thank you for all you help!!
I will test this on my real project and share results with you.

 

@Gonmarte
Did you create the list "dogs" before?

 

I just realized that now
I didnt quite undestand why i need to create a new list.... its working, but if you could explain i would apreciate.

 

@Gonmarte
Depends on which one you mean. The "dogs" one? That is quite easy. Normally you created it in your first constructor, but that was never called. This means that the list "dogs" was just declared at the of of the class, but there was never a value assigned to it.

The other list is just there to be able to loop through it and keep the code a bit more clear.

 

It was the dogs one. But nvm i understood This method deserialize is a constructor that does the same as my other constructor. The difference is that, the other one, i can write the data for the dog, in this one, it will load the data to "create" the dog again with the data.
Thank you!!
I will mark this as solved and i will tag you if i find anything weird.
Thanks