Test support: assertions on aggregates and business rules, and Testcontainers presets for Redis, MySQL and RocketMQ

MyBatis-Plus auto-configuration: pagination and optimistic lock interceptors

Two-level cache: Caffeine (L1) in front of Redis (L2) behind Spring Cache

Aggregate locks and duplicate-submit protection on Redisson, keyed by aggregate and request

Publishes domain events collected by aggregate roots through Spring's application event bus

Scheduled jobs that run on one instance at a time, on Spring scheduling and ShedLock

Read models kept up to date from the write model: dirty marks committed with the change, refreshed after commit, rebuildable