Jitsu-13/Auction_Management_System ? reverse-engineered prompt

Build me a simple Java based auction management system that runs from the console and uses MySQL to store everything.

I want three kinds of users, an administrator, a buyer, and a seller. Sellers should be able to register, add items for sale, update item details like price and quantity, see their sold item history, and remove items they no longer want to sell. Buyers should be able to register, browse items by category, view sellers and their items, and choose items to buy. The administrator should be able to see the list of registered buyers and sellers, check daily sales and dispute reports, and mark disputes as solved.

Please keep it organized and use a clean design so the database access is separated from the rest of the app. Make it feel like a real auction management system, with basic menus, validation, and a smooth user flow. If anything is unclear, use sensible defaults and look up current Java and MySQL best practices online if needed.