Published onJune 29, 2026Reliable External API Delivery with Spring Boot, PostgreSQL, and KafkaExternal-IntegrationSpring-BootPostgreSQLTransactional-OutboxApache-KafkaIdempotencyPersist external-call intent with business data, claim work safely across replicas, classify retries, handle ambiguous HTTP outcomes, and use Kafka only through a durable outbox or CDC boundary.