SpringBoot OAuth2 with keycloak for Bearer Client
Keycloak is an open-source Identity and Access Management (IAM) solution aimed at modern applications and services. Keycloak provides out-of-the-box authentication and authorization services as well as advanced features like User Federation, Identity Brokering, and Social Login.
To Secure SpringBoot app with Keycloak we can use Keycloak SpringBoot adapter JAR as dependency and provide some configurations in
application.properties, you can find more info about using spring-boot-adapter in Keycloak Docs.