How to implement integration Spring Boot with Supabase?

Hello, Dear Developers!

Thank you for reaching my article out.

Recently, I'm developing a real estate project with React.js + TailwindCSS as Frontend and Supabase as Backend.
While developing, I wanna change my project architecture from Frontend->BaaS to Frontend->Backend->BaaS. The Backend is Spring Boot Framework.

But I don't know exactly how to integrate Spring Boot Framework with Supabase.

Follow screen captures are my recent working.

Please help me out.
Thank you.

-application.yml

-AdminSupabaseClient

-AdminService

-AdminController

-Unauthorized Error