SSO - another application user wants to access my application

Question

I have two applications called like app1 and app2. both apps have there own users separately. Now suppose user with user-name usr1 from app1 logged into app1. Now he want to access app2 without logging into app2. My clients are not interested to use any IDP like okta, ssoCircle, oneLogin and so on.

Is there any way to give access usr1 on app2 without login into app2? user will only login into app1 and he will get access to app2.

Thanks in advance.

Answer 1

If you want to access second app without login, then JWT is the best solution. Though your question is not clear like are both apps using Java/Spring, why your client is not willing to use SSO?