Save Arraylists of UUIDs in Config

Hey,

like I said in the title I want to save an Arraylist of UUIDs of Players in the Config File.
Here how I try to save them:

Code:

String t = "";
ArrayList<UUID> pt = new ArrayList<UUID>();
public void save() {
        t.getConfig().set("one", t);
        t.getConfig().set("two", pt);
}

I keep getting this error:

Error (open) Error (close)

[05:39:29 ERROR]: Cannot load plugins\Towns\config.yml
org.bukkit.configuration.InvalidConfigurationException: could not determine a co
nstructor for the tag tag:yaml.org,2002:java.util.UUID
in 'string', line 3, column 3:
- !!java.util.UUID {}

I save the config at onDisable() and Load ist an OnEnable(), this error occurs when I am trying to reload the server.

Does somebody have an idea how to fix this? I googled but I got even more confused.

 

@Blablablub100 Don't believe there is proper serialization for a UUID, Use a List<String> instead and add/remove the UUID in a String form

 

@Blablablub100
save UUID.toString and load UUID.fromString(String uuid);

 

.

 

Thank you, this worked for my UUIDs, but now I want to save Blocks in the configs. I can convert them to Strings but I can not make the String to a Block
The ArrayList:

Code:

ArrayList<Block> protectedChests = new ArrayList<Block>();

How I save the Arraylist:

Code:

t.getConfig().set("eight", protectedChests1.toString());

How I get the ArrayList:

Code:

stringlist = (ArrayList<String>) t.getConfig().getStringList("six");

Now my question is how to convert this stringlist into a blocklist.

 

@Blablablub100

Are you trying to save the acutal block it's self or just the type. In that case you could just save the Blocks's Name or Id type.