<ul><li>When implementing OAuth2 authentication in a Spring Boot application using Spring Authorization Server, default AuthenticationProviders can conflict with custom authentication logic, causing crashes and errors.</li><li>Default AuthenticationProviders are included in Spring Security to simplify development, but conflicts arise when custom logic diverges from default mechanisms.</li><li>To address conflicts, exclude default providers by customizing the AuthenticationManager to only use your custom provider.</li><li>Ensure your custom provider is correctly implemented, customize the AuthenticationManager, and utilize it in your Spring Boot application for a streamlined authentication flow.</li></ul>

How to Remove Default AuthenticationProviders in Spring Authorization Server

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