Spring Cloud Quality Control & Assurance 4

Question 1

When a Spring Cloud Contract stub is published to a Maven repository, which classifier is used by convention?

Accepted Answer

stubs

Answer

By convention, Spring Cloud Contract packages stubs as a JAR with the 'stubs' classifier, e.g., my-service-1.0.0-stubs.jar.

Question 2

Which property in Spring Cloud Sleuth controls the percentage of requests that are traced (sampling rate)?

Accepted Answer

spring.sleuth.sampler.probability

Answer

spring.sleuth.sampler.probability accepts a value between 0.0 and 1.0, where 1.0 means 100% of requests are traced.

Question 3

Which Testcontainers integration is used in Spring Boot tests to spin up a real database for integration testing?

Accepted Answer

@Testcontainers and @Container with a database image

Answer

@Testcontainers activates Testcontainers lifecycle management and @Container defines the Docker container (e.g., PostgreSQLContainer) to start for the test.

Question 4

In Resilience4j, what is the difference between a Retry and a Circuit Breaker when used together in Spring Cloud?

Accepted Answer

Retry retries individual calls; Circuit Breaker stops calls after a threshold of failures

Answer

Retry automatically re-attempts a failed call a configured number of times, while Circuit Breaker opens and short-circuits calls entirely after failure thresholds are exceeded.

Question 5

What Spring Boot mechanism allows you to verify that Actuator health indicators report the correct status in tests?

Accepted Answer

TestRestTemplate or WebTestClient calling /actuator/health and asserting the JSON body

Answer

Using TestRestTemplate or WebTestClient to call /actuator/health in an integration test gives you the full JSON health response for assertion.

Spring Cloud Practice Test

Spring Cloud Practice Test

Spring Cloud Quality Control & Assurance 4