spring-boot-cache

# Spring Boot Cache Abstraction ## Overview 6-step workflow for enabling cache abstraction, configuring providers (Caffeine, Redis, Ehcache), annotating service methods, and validating behavior in Spring Boot 3.5+ applications. Apply `@Cacheable` for reads, `@CachePut` for writes, `@CacheEvict` for deletions. Configure TTL/eviction policies and expose metrics via Actuator. ## When to Use - Add `@Cacheable`, `@CachePut`, or `@CacheEvict` to service methods. - Configure Caffeine, Redis, or Ehcache with TTL and capacity policies. - Implement eviction strategies for stale data. - Diagnose cache misses or invalidation issues. - Expose hit/miss metrics via Actuator or Micrometer. ## Instructions 1. **Add dependencies** — `spring-boot-starter-cache` plus a provider: - Caffeine: `caffeine` starter - Redis: `spring-boot-starter-data-redis` - Ehcache: `ehcache` starter 2. **Enable caching** — annotate a `@Configuration` class with `@EnableCaching` and define a `CacheManager` bean. 3. **Annotate methods** — `@Cacheable` for reads, `@CachePut` for writes, `@CacheEvict` for deletions. 4. **Configure TTL/eviction** — set `spring.cache.caffeine.spec`, `spring.cache.redis.time-to-live`, or `spring.cache.ehcache.config`. 5. **Shape keys** — use SpEL in `key` attributes; guard with `condition`/`unless` for selective caching. 6. **Validate setup** — run integration test to confirm cache hit on second call; check `GET /actuator/caches` to verify cache manager r...