Spring boot keycloak: How to handle token expiration and refresh token - spring

I am using spring boot security and spring boot keycloak starter to secure rest APIs and authenticate users.
My first question is how to handle access token expiration if user's session is still valid.
The second question is getting the access token from keycloak into spring boot app is done by calling this line
AccessTokenResponse response = authzClient.obtainAccessToken(username, password);
in the same way how to call refresh token api

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Spring boot 3 Oauth3 resource server. Token is valid until the token expires, If user logout

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After user logout from keycloak the token should become invalid automatically.
What are you using on the client side and how you are performing logout?

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