This plugin syncs players' inventory and armor using a database.
I wrote the plugin for paper, but it should work on Bukkit/Spigot too.
Tested minecraft version: 1.19.3
# MySQL Database
database:
host: 127.0.0.1
port: 3306
# Database name (The database must exist)
databaseName: 'minecraft'
username: 'minecraft'
# Use a strong password!
password: 'password'
general:
# Enable inventory sync
syncInventory: true
# Enable armor sync
syncArmor: true
# Time between data saves in minutes. (0 to only sync when connecting/disconnecting)
saveInterval: 2
debug:
# Inventory sync debug messages.
syncMessages: false