Spring Cloud Technology & Digital Applications 4

Question 1

Which actuator endpoint must be exposed to trigger a live configuration refresh on a Spring Cloud Config client without restarting?

Accepted Answer

/actuator/refresh

Answer

POST-ing to /actuator/refresh causes the application context to re-fetch properties from Config Server and re-bind @RefreshScope beans.

Question 2

What Spring Cloud abstraction wraps Resilience4j or Sentinel so applications aren't tied to a specific circuit breaker library?

Accepted Answer

Spring Cloud Circuit Breaker API

Answer

Spring Cloud Circuit Breaker provides a unified facade over multiple circuit breaker implementations, enabling library-agnostic code.

Question 3

In Spring Cloud Stream, what is a 'binding'?

Accepted Answer

The bridge between a messaging channel and a message broker destination

Answer

A binding in Spring Cloud Stream connects a named channel (input/output) in the application to a physical topic or queue on the broker.

Question 4

Which property controls the maximum number of retry attempts in a Spring Cloud Gateway retry filter?

Accepted Answer

retries (in the Retry filter config)

Answer

The Retry GatewayFilter is configured with a 'retries' field directly in the route's filter definition, not a top-level property.

Question 5

What is the purpose of the @RefreshScope annotation in a Spring Cloud application?

Accepted Answer

Marks a bean to be destroyed and recreated after a config refresh event

Answer

@RefreshScope causes the annotated bean to be lazily re-initialized with new property values when a /actuator/refresh event is triggered.

Spring Cloud Practice Test