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How to Add OIDC Login to Spark Java Apps Using pac4j Security Library

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Developers building Spark Java web applications can secure specific routes with OpenID Connect (OIDC) authentication using the spark-pac4j library, which provides ready-made filters and routes for login, callback, and logout flows. The spark-pac4j SecurityFilter plugs into Spark's built-in before-filter mechanism, eliminating the need to write custom authentication checks. The setup works with any OIDC-compliant provider, including Keycloak, Google, Microsoft Entra ID, and Okta, using Spark 2.9 and Java 17. Configuration is handled through pac4j's framework-agnostic engine, meaning the same OIDC setup used in a Spring Boot project can be reused here with minimal changes. The integration depends on two key dependencies — spark-pac4j for framework binding and pac4j-oidc for protocol handling — both targeting pac4j version 6.

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