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Add resilience4j-circuit-breaker: Resilience4j 2.4.0 vs Spring Framework 7 core, on Boot 4.1

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Companion module for the rewritten post 'Resilience4j Circuit Breaker in Spring Boot 4.1:
What It's Still For', reworked around Framework 7 now shipping @Retryable/@ConcurrencyLimit
in core. Covers what's still Resilience4j's job (circuit breaker, rate limiter, bulkhead's
bounded wait, fallback methods, Actuator/Micrometer metrics), the off-by-one between
maxAttempts and maxRetries, and two Boot-4.1 build breaks: spring-boot-starter-aop no longer
exists (renamed to spring-boot-starter-aspectj, proven with Maven Central metadata and the
renamed starter's own POM -- see resilience/docs/08-starter-aop-renamed-to-starter-aspectj.md
in this same repo), and the resulting fix uses that renamed starter directly rather than
assembling spring-aop + aspectjweaver by hand. Kept as its own module rather than a new
top-level repository, alongside the existing resilience/ module for the sibling Framework-7
post.
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asmhatre
2026-09-18 08:40:50 +00:00
parent 604291067e
commit 320733265f
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resilience4j-circuit-breaker/docs/output/01-circuitbreaker-trip.txt
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Resilience4j circuit breaker: trip, stay open, half-open, recover
=================================================================
Config: slidingWindowSize=10, minimumNumberOfCalls=5, failureRateThreshold=50%, waitDurationInOpenState=2s
-- Phase 1: 6 calls against a dead downstream (only 6, to satisfy minimumNumberOfCalls=5) --
call 1 -> FALLBACK for order-1: DownstreamUnavailableException - payment-gateway rejected call #1 [breaker state=CLOSED]
call 2 -> FALLBACK for order-2: DownstreamUnavailableException - payment-gateway rejected call #2 [breaker state=CLOSED]
call 3 -> FALLBACK for order-3: DownstreamUnavailableException - payment-gateway rejected call #3 [breaker state=CLOSED]
call 4 -> FALLBACK for order-4: DownstreamUnavailableException - payment-gateway rejected call #4 [breaker state=CLOSED]
call 5 -> FALLBACK for order-5: DownstreamUnavailableException - payment-gateway rejected call #5 [breaker state=OPEN]
call 6 -> FALLBACK for order-6: CallNotPermittedException - CircuitBreaker 'paymentService' is OPEN and does not permit further calls [breaker state=OPEN]
Breaker state after 6 failing calls: OPEN (downstream was actually called 5 times)
-- Phase 2: 3 more calls while OPEN — these must NOT reach the downstream --
call 7 -> FALLBACK for order-7: CallNotPermittedException - CircuitBreaker 'paymentService' is OPEN and does not permit further calls [breaker state=OPEN, downstream calls so far=5]
call 8 -> FALLBACK for order-8: CallNotPermittedException - CircuitBreaker 'paymentService' is OPEN and does not permit further calls [breaker state=OPEN, downstream calls so far=5]
call 9 -> FALLBACK for order-9: CallNotPermittedException - CircuitBreaker 'paymentService' is OPEN and does not permit further calls [breaker state=OPEN, downstream calls so far=5]
Downstream call count unchanged (5) -- the breaker short-circuited all 3 calls without touching the downstream.
-- Phase 3: wait 2.2s for waitDurationInOpenState, downstream now recovers, probe with permittedNumberOfCallsInHalfOpenState=2 --
half-open probe 1 -> OK (call #1) [breaker state=HALF_OPEN]
half-open probe 2 -> OK (call #2) [breaker state=CLOSED]
Breaker state after 2 successful half-open probes: CLOSED