My project is built using Spring (not Springboot) framework. I am making use of Spring security to get access token from another service which is built using SpringBoot.

Now, since I do not see oauth package in Spring Security of Spring framework project, I am not sure how to get access token here.

I don’t have username/password/private token of jwt. What I have is client Registration id and principal name. Can anyone share some example and reference, how to achieve this?

I tried searching for the solution on internet but everywhere it is about SpringBoot + Spring Security.
The jwt token authentication way doesn’t seem possible as I do not have the privateJwtToken.