Spring Cloud Communication & Stakeholder Relations 5

Question 1

A product owner wants to know what fallback behavior Spring Cloud Resilience4j provides when a circuit is OPEN. What should the developer implement?

Accepted Answer

A fallback method or Fallback Factory returns a default response instead of calling the failing service

Answer

When the circuit is OPEN, Resilience4j invokes a configured fallback method or factory that returns a safe default, preventing calls to the failing downstream service.

Question 2

A CTO asks how Spring Cloud handles the communication pattern where a service produces events consumed by multiple downstream services without tight coupling. Which component enables this?

Accepted Answer

Spring Cloud Stream with a message broker binder

Answer

Spring Cloud Stream provides an abstraction over message brokers (Kafka, RabbitMQ) that decouples producers and consumers via named channels.

Question 3

A stakeholder asks how to enforce that only authenticated services can call internal APIs in a Spring Cloud microservices architecture. Which approach is most robust?

Accepted Answer

Mutual TLS (mTLS) authentication between services

Answer

Mutual TLS requires both caller and receiver to present certificates, providing strong cryptographic authentication between services without relying on network-level controls alone.

Question 4

During a sprint review, a developer explains that a Feign client is experiencing slow calls. Which Resilience4j feature can be layered with Feign to reject calls that exceed a duration threshold?

Accepted Answer

TimeLimiter

Answer

TimeLimiter enforces a maximum call duration and cancels calls that exceed the configured timeout, complementing circuit breaker protection for slow dependencies.

Question 5

A stakeholder asks how Spring Cloud Gateway propagates the original client's trace context to downstream services. What mechanism ensures this?

Accepted Answer

Gateway forwards B3 propagation headers (X-B3-TraceId, X-B3-SpanId) injected by Sleuth

Answer

Spring Cloud Sleuth integrated with Gateway automatically injects and forwards B3 propagation headers so the full request chain shares the same trace ID.

Spring Cloud Practice Test

Spring Cloud Practice Test

Spring Cloud Communication & Stakeholder Relations 5