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Choose the authentication flow and JAX-RS runtime
First decide whether users sign in through a browser or an API caller presents an access token. Those are different integrations: browser login redirects to an identity provider and needs state preserved across the redirect, while the bearer-token pattern validates an existing token without redirecting the caller.
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| Use case | pac4j approach | What the application needs |
|---|---|---|
| Interactive browser login | Indirect OIDC client, typically OidcClient |
Provider redirect, callback and logout resources, and session support for state |
| API request with an existing token | HeaderClient using the OIDC profile creator |
An Authorization: Bearer ... header; no browser redirect or local session |
Use the integration module that matches the JAX-RS runtime line: the guide lists jersey3-pac4j, jersey4-pac4j, resteasy6-pac4j, and resteasy7-pac4j. Runtime-specific request/session access and profile injection are not interchangeable. Dropwizard’s pac4j bundle handles much of the feature registration for its integration.
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Check prerequisites and dependencies
The official pac4j guide’s standalone example uses Java 17 or later and Maven, with Jersey 4 and Grizzly. Its example versions are jersey4-pac4j 8.0.0 and pac4j-oidc 6.5.8; these are example coordinates, not a guarantee that every combination of pac4j and runtime versions is compatible. Check the project’s dependency and release documentation before selecting versions. The guide’s implementation steps are at pac4j’s OIDC client documentation.
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Register an OIDC application with your identity provider and obtain its client ID and secret. Configure the provider’s discovery URI, usually its .well-known/openid-configuration endpoint. pac4j reads the provider metadata to locate endpoints such as authorization, token, user-info, and JWKS.
Configure the client and callback URL
Create an OidcConfiguration with the discovery URI, client ID, and client secret, then construct an OidcClient. Pass the callback base URL when creating pac4j’s Config, for example:
OidcConfiguration oidcConfiguration = new OidcConfiguration();
oidcConfiguration.setDiscoveryURI(discoveryUri);
oidcConfiguration.setClientId(clientId);
oidcConfiguration.setSecret(clientSecret);
OidcClient oidcClient = new OidcClient(oidcConfiguration);
Config config = new Config(baseUrl + "/callback", oidcClient);Register the externally reachable callback URI with the identity provider, including pac4j’s client-name query parameter. For the generic client, the form is https://your-public-host/your-context/callback?client_name=OidcClient. Match the actual public scheme, hostname, port, context path, callback path, and query string exactly. If a reverse proxy exposes a different public URL from the application’s internal address, use the public URL in the provider registration and pac4j configuration.
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For the guide’s standalone Jersey 4 and Grizzly example, register Pac4JGrizzlyFeature to provide request and session access, Pac4JSecurityFeature for pac4j security, and Pac4JValueFactoryProvider.Binder for profile injection. In a servlet deployment, register Pac4JServletFeature(config) to use the container’s HttpSession. RESTEasy with CDI uses its security feature and Pac4JProfileInjectorFactory rather than Jersey’s value-factory binder. Use the setup for your actual runtime, not a mixture of registration examples.
Add callback, logout, and protected resources
Provide resource methods annotated with @Pac4JCallback and @Pac4JLogout so pac4j can complete the OIDC callback and handle logout. Protect the resource or class that requires authentication with @Pac4JSecurity(clients = "OidcClient"). Inject the authenticated profile with @Pac4JProfile; if injection is missing, confirm that the runtime-specific injector or value factory is registered.
Handle bearer-token API requests separately
For an API that receives an access token in the request, the guide uses pac4j-http and a HeaderClient configured to read the Authorization: Bearer header. Initialize the OIDC client and use its profile creator to validate the token through the provider’s user-info endpoint. In this mode the example sets the OIDC callback URL to notused and uses a no-op session store; it does not send the caller through a login redirect or depend on browser session state.
A rejected token can result in an unauthorized response. Check that the token comes from the expected issuer/provider and that the request meets the provider’s requirements, including the openid scope described in the pac4j OIDC guide.
Adapt provider and client names consistently
The generic OidcClient uses discovery metadata. pac4j also documents provider-specific clients for common identity providers. The guide includes examples for Keycloak, Google, and Microsoft Entra ID, and describes generic OIDC use with providers such as Okta, Auth0, and CAS. Provider selection can change the discovery configuration and, for a provider-specific client, the client class or name. Keep the chosen client name consistent in the callback URI’s client_name parameter and the @Pac4JSecurity annotation. Provider console labels and endpoints may change, so use the provider’s current OIDC application instructions.
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Remove demo-only security settings before deployment
The public guide’s demo allows unsigned ID tokens with setAllowUnsignedIdTokens(true). Do not carry that setting into a real-provider deployment: remove it so signature verification can use the provider’s JWKS. Also review session renewal for the runtime you deploy. The Grizzly example sets renewSession = false and warns about session identifier rotation and session fixation; the guide recommends a servlet-backed runtime with renewSession = true, or validating renewal behavior against the Grizzly version before enabling it.
Quick Recap
Troubleshoot common integration failures
- “Invalid redirect URI”: Compare the provider’s registered URI with the externally reachable callback, including context path and
?client_name=OidcClient. - Login repeats or loses state: Confirm that the browser-login deployment registers the appropriate Grizzly or servlet session feature.
@Pac4JProfileis not populated: Register the profile injector for the actual runtime; Jersey and RESTEasy use different setup.- Bearer-token request returns 401: Check token issuer/provider acceptance and required scopes, including
openid; this flow validates the supplied token rather than logging a user in interactively.
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