Enterprise SSO in a Java EE App: OIDC Without a Vendor SDK

Jakarta EE 10 and later include built-in OpenID Connect support through `@OpenIdAuthenticationMechanismDefinition`, allowing applications to configure an identity provider, client details, redirect URI, scopes, and related options while the container manages discovery, authorization-code exchange, ID token validation, and principal establishment for existing declarative security. User information, identity tokens, and access tokens can be accessed through an injected `OpenIdContext`, while client secrets should be supplied through runtime expression-based configuration rather than embedded in source code or deployment artifacts. The guide emphasizes exact redirect URI matching, careful proxy and context-root configuration, session replication and provider logout behavior, and identity-layer routing for multi-tenant SSO. Java EE 8 and Jakarta EE 8 or 9 do not provide this OIDC mechanism, leaving upgrades, web-server authentication such as Apache `mod_auth_openidc`, or a custom authentication mechanism as the principal options, with custom implementations requiring substantial protocol and cryptographic security work. It also advises verifying third-party dependencies and notes that a previously documented Maven artifact was unavailable, illustrating the importance of confirming that referenced libraries are published and maintained.

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