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How does Spring Boot handle circuit breaker internal state transitions?

Updated May 17, 2026

Short answer

Circuit breakers transition between CLOSED, OPEN, and HALF-OPEN states based on failure thresholds.

Deep explanation

In Resilience4j, circuit breaker monitors failure rates. When threshold is exceeded, it opens to stop calls. After a wait period, it transitions to HALF-OPEN to test recovery. If successful, it closes again.

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