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Add redis: Boot 4.1 + Spring Data Redis 4.1, the JDK-serialisation default vs Jackson 3 serializers, @RedisHash TTL and keyspace events, @RedisListener, and Redis as the Spring cache

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Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
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Claude
2026-09-21 15:46:55 +00:00
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| [`resilience4j-circuit-breaker/`](resilience4j-circuit-breaker) | [Resilience4j Circuit Breaker in Spring Boot 4.1: What It's Still For](https://ankurm.com/resilience4j-circuit-breaker-spring-boot/) | the circuit breaker verified through trip/open/half-open/recover, `spring-boot-starter-aop` renamed to `spring-boot-starter-aspectj` (not removed), and where Resilience4j still beats Framework 7's own `@Retryable`/`@ConcurrencyLimit` |
| [`observability/`](observability) | [A Practical Guide to Monitoring Spring Boot Microservices: Prometheus, Grafana, and Boot 4.1's OpenTelemetry Starter](https://ankurm.com/a-practical-guide-to-monitoring-spring-boot-microservices-with-prometheus-grafana/) | real metrics and traces pushed via OTLP to a real `grafana/otel-lgtm` container, Docker Compose auto-wiring the endpoint with zero `management.otlp.*` properties, `@Observed` silently inert without an explicit `ObservedAspect` bean, and a dual-version (Boot 4.0 vs 4.1) proof of which `OTEL_*` environment variables are genuinely new |
| [`caching/`](caching) | [The Spring Cache Abstraction: @Cacheable, @CacheEvict, Key Generators and the Self-Invocation Trap](https://ankurm.com/spring-cache-abstraction-cacheable-cacheevict-self-invocation-trap/) | the self-invocation trap measured four ways, the key collision `SimpleKeyGenerator` makes easy, eviction timing under a thrown exception, a rollback the cache keeps, and where this sits next to Hibernate's L2 cache |
| [`redis/`](redis) | [Redis with Spring Boot 4.1: RedisTemplate, StringRedisTemplate, @RedisHash, Pub/Sub and TTL](https://ankurm.com/redis-with-spring-boot-4-1/) | the default JDK-serialised `RedisTemplate` writing keys `redis-cli` cannot read, before and after Jackson 3 serializers (class names read with `javap`, the `@class` allow-list), the six keys two `@RedisHash` entities create, expired hashes leaving index entries behind unless keyspace events are on, `@RedisListener` on Boot 4.1's auto-configured container, a plain `set` clearing a TTL, and a `RedisCacheConfiguration` bean silently overriding `spring.cache.redis.time-to-live` |
| [`spring-batch/`](spring-batch) | [Spring Batch on Boot 4.1: Jobs, Steps, Chunk Processing and Restartability](https://ankurm.com/) | a job that fails mid-chunk and resumes exactly where it left off across two separate JVMs, skip vs. restart on the same poisoned row, the resourceless job repository that forgets a restart ever happened, and the `chunk(int)` vs `chunk(int, tx)` builder split |
| [`spring-batch-partitioning/`](spring-batch-partitioning) | [Spring Batch Partitioning and Parallel Steps: Scaling a 10-Million-Row Job](https://ankurm.com/) | the real grid-size sweep at 10M and 300K rows (best speedup 1.42x, on 2 cores), `MultiResourcePartitioner` ignoring gridSize entirely, a rejected partition's `StepExecution` stuck at `STARTING` forever, and Spring Batch 6.0's new `JobOperator#recover` unsticking it |
| [`db-migrations-flyway-liquibase/`](db-migrations-flyway-liquibase) | [Flyway vs Liquibase for Spring Boot 4: Migrations, Rollbacks and Baselines](https://ankurm.com/flyway-vs-liquibase-spring-boot-4-migrations-rollbacks-baselines/) | Flyway Community's `undo` throwing `FlywayRedgateEditionRequiredException` at runtime, a real Liquibase 5.0.3 filename-caching defect that produces a phantom successful run, Liquibase's 10-second default lock-poll rate versus Flyway's near-instant row lock, the FSL license change and its ASF/Keycloak fallout, and what actually happens when both tools are enabled against one database |
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## Running any of them
Each project needs a JDK 25 and Maven 3.9. `docker-images` and `observability` also need
Each project needs a JDK 25 and Maven 3.9. `redis` also needs `redis-server` and `redis-cli` on the
`PATH`. `docker-images` and `observability` also need
Docker, and `kubernetes-deployment` Docker plus a Kubernetes cluster; their READMEs list the rest:
```bash