java
Articles tagged with java.
Keycloak SPI ID Collision: Redis Cache Ran on Infinispan
Keycloak's ProviderManager dedupes SPI factories by provider ID before isSupported() runs. A shared "default" ID silently dropped our Redis cache…
11 min readKeycloak User Federation: Building a Custom Provider
Build a custom Keycloak UserStorageProvider SPI for user federation with external databases, covering credential validation, caching, and lazy loading.
13 min read
Spring Boot + Keycloak OAuth 2.0: The Complete 2026 Guide
The complete guide to securing Spring Boot 3.x apps with Keycloak using spring-security-oauth2-resource-server, JWT validation, and method-level security.
10 min readKeycloak Custom SPI Development: Build Your First Extension
Build custom Keycloak extensions using the SPI framework. Complete tutorial covering EventListenerProvider, Authenticator, and UserStorageProvider with code.
11 min readKeycloak Testcontainers: Automated Auth Testing in CI/CD
Use Testcontainers to spin up real Keycloak instances in integration tests with Java, Python, and Node.js examples for reliable CI/CD…
10 min read
Migrating from Legacy Keycloak Spring Boot Adapters
Step-by-step guide to migrating from deprecated Keycloak Spring Boot adapters to Spring Security native OAuth2/OIDC support in your Java applications.
8 min readStay ahead on identity & security
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