public class PlayerJoinListener implements Listener {
    public HashMap<UUID, PermissionAttachment> playerPermissions = new HashMap<>();
    public List<String> permissions;
    @EventHandler
    public void onPlayerJoin(PlayerJoinEvent e){

        Player p = e.getPlayer();
        permissions = new ArrayList<>();
        UUID uuid = e.getPlayer().getUniqueId();
        //PermissionConfig.INS.setPermission("groups." + uuid + ".permissions", perms);
        setupPermissions(p);
    }
    public void setupPermissions(Player p){
        PermissionAttachment attachment = p.addAttachment(Plugin.INSTANCE);
        this.playerPermissions.put(p.getUniqueId(),attachment);
        permissionSetter(p.getUniqueId());
    }
    private void permissionSetter(UUID uuid){
        PermissionAttachment attachment = this.playerPermissions.get(uuid);
        String rank = PermissionConfig.INS.get("groups." + uuid + ".rank");
        for(String permissions : PermissionConfig.getConfiguration().getStringList("groups." + rank + ".rank")) {
            attachment.setPermission(permissions, true);
        }
    }
}