Spring Boot and Spring Cloud: Auto-Configuration, Transactions, Service Discovery, Gateway, and Observability

The 13 Spring Boot/Cloud notes in Fuwari form the main body of microservice notes: auto-configuration, startup, transactions, service discovery, gateway, and observability. This page converges them into reusable contracts anchored on service discovery.

Core Mechanism

• Boot: SpringBootAuto-configuration.md covers @EnableAutoConfiguration and conditionals; SpringTransactions.md covers propagation and isolation.
• Service discovery: Nacos.md and ConsulServiceRegistrationandDiscovery.md compare AP/CP, health checks, and config centers; dubbo-nacos-runtime already has pinned evidence for Dubbo+Nacos.
• Calls and gateway: OpenFeign.md, LoadBalancer.md, SpringCloudGateway.md cover declarative calls, load balancing, and routing.
• Resilience and observability: Sentinel.md, CircuitBreakerPatterns, BulkHeadBasics cover circuit breaking/rate limiting/isolation; SetupofMicrometerandZipkinTracing.md covers tracing.

Applicability

• Spring ecosystem that needs to quickly assemble service discovery and gateway for microservices.

Not Applicable and Risks

• Source versions are not fully pinned and drift from current Spring Boot 3.x / Cloud 2023; SpringSecurityAndCloudPermissionService touches permissions and must be rechecked against current versions.
• Transaction and distributed transaction boundaries (not covered separately) need explicit evaluation.

Minimum Verification

1. Auto-configuration: locate candidates in spring.factories/imports.
2. Service discovery: start/stop local Nacos/Consul and verify health and routing.
3. Gateway: unit-test predicates and filters, load-test circuit breaker/rate limit thresholds.

Evidence and Uncertainty

• Source facts: ingest-spring-cloud contains 13 source notes, some with zero-width characters in filenames.
• Synthesis: This page converges scattered notes into a call-chain model.
• Unconfirmed: Spring Cloud version matrix and Gateway predicate syntax must be verified against current versions.

Related Pages

• dubbo-nacos-runtime
• multi-service-readiness
• microservice-data-ownership
• containerd-tls-troubleshooting

Sources and related documents

• ingest-spring-cloud
• Dubbo + Nacos: Verify the Registration Name and group/version First, Then Run a Real Smoke Test
• Multi-Service Startup Readiness: running, ready, and Dependency/Failure/Restart Propagation
• Microservice Data Ownership: Establish the Domain Owner First, Then Talk About Database Splitting and Migration
• containerd TLS: Choosing a Trusted Chain or Temporary Verification Bypass