Get both production-ready Spring Boot 4 starters and save $9.

- Spring Boot 4 API Starter: REST API with security, validation, error handling, OpenAPI docs, tests and Docker.

- Spring Boot 4 Kafka Event Starter (v1.0.1): transactional outbox, idempotent consumers, retries and Dead Letter Topics, 16 tests.

Java 21, Maven, ready to clone and run. Separately $54, together $45.