VMware Spring Professional Develop (Spring Cloud) — Questions and Answers

Question 1: PCI-DSS Requirement 10 mandates tracking and monitoring all access to network resources. In Spring Cloud, which combination best satisfies this?

Feign client interceptors only
Spring Cloud Sleuth distributed tracing + centralized log aggregation (ELK) (Correct answer)
Spring Cloud Config + Vault
Spring Boot DevTools + H2 console

Correct answer: Spring Cloud Sleuth distributed tracing + centralized log aggregation (ELK)

Spring Cloud Sleuth adds trace/span IDs to all service calls, and centralized log aggregation enables complete access monitoring required by PCI-DSS Requirement 10.

Question 2: What is the consequence of non-compliance for Spring Cloud professionals?

Only verbal warnings
Potential fines, license revocation, legal liability, and reputational damage (Correct answer)
No significant consequences
Just additional paperwork

Correct answer: Potential fines, license revocation, legal liability, and reputational damage

This is fundamental to Spring Cloud practice. Potential fines, license revocation, legal liability, and reputational damage represents the professional standard for regulatory in the Spring Cloud certification framework.

Question 3: A product owner wants to know what fallback behavior Spring Cloud Resilience4j provides when a circuit is OPEN. What should the developer implement?

Spring retries the call indefinitely until success
The service blocks the thread until the circuit closes
Resilience4j restarts the downstream service automatically
A fallback method or Fallback Factory returns a default response instead of calling the failing service (Correct answer)

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

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 4: Which property disables Eureka registration for a Spring Boot service during local development?

eureka.client.register-with-eureka=false (Correct answer)
eureka.client.fetch-registry=false
eureka.server.enabled=false
spring.cloud.discovery.enabled=false

Correct answer: eureka.client.register-with-eureka=false

Setting eureka.client.register-with-eureka=false prevents the service from registering itself with the Eureka server.

Question 5: In Spring Cloud Gateway, which built-in filter adds a request rate limiting capability to protect downstream services?

QuotaFilter
RequestRateLimiter GatewayFilter (Correct answer)
ThrottleGatewayFilter
RateLimit GatewayFilter

Correct answer: RequestRateLimiter GatewayFilter

The RequestRateLimiter GatewayFilter factory in Spring Cloud Gateway uses a backend (e.g., Redis) to enforce rate limits on incoming requests per key.

Question 6: Which Spring Cloud circuit breaker implementation is based on Resilience4j?

Spring Cloud CircuitBreaker with Resilience4j (Correct answer)
Spring Cloud Retry
Spring Cloud Hystrix
Spring Cloud Fault Tolerance

Correct answer: Spring Cloud CircuitBreaker with Resilience4j

Spring Cloud CircuitBreaker provides an abstraction with a Resilience4j implementation, replacing the deprecated Netflix Hystrix circuit breaker.

Question 7: What HTTP status code does a Spring Cloud health check endpoint return when a service is UP and healthy?

200 OK (Correct answer)
202 Accepted
201 Created
204 No Content

Correct answer: 200 OK

Spring Boot Actuator's /actuator/health endpoint returns HTTP 200 OK with a JSON body containing status UP when the application is healthy.

Question 8: In Spring Cloud Gateway, what is a 'Predicate' used for?

Balancing load across downstream service instances
Performing authentication and authorization checks
Matching incoming requests to determine which route to apply (Correct answer)
Modifying the request or response headers

Correct answer: Matching incoming requests to determine which route to apply

Predicates in Spring Cloud Gateway are conditions evaluated against incoming requests (path, headers, method, etc.) to determine if a route matches.

Question 9: What is the default load balancing algorithm used by Spring Cloud LoadBalancer?

Least connections
Weighted round-robin
Random selection
Round-robin (Correct answer)

Correct answer: Round-robin

Spring Cloud LoadBalancer uses round-robin as its default algorithm, cycling through available service instances in order.

Question 10: Which Spring Cloud starter dependency integrates Resilience4j as the circuit breaker implementation for Spring Boot 3 projects?

spring-cloud-starter-circuitbreaker-resilience4j (Correct answer)
resilience4j-spring-cloud
spring-boot-starter-resilience4j
spring-cloud-resilience4j-starter

Correct answer: spring-cloud-starter-circuitbreaker-resilience4j

The spring-cloud-starter-circuitbreaker-resilience4j dependency provides Spring Cloud's Circuit Breaker abstraction backed by Resilience4j.

Question 11: How should Spring Cloud professionals handle conflicts with stakeholders?

Address issues professionally through active listening, finding common ground, and seeking resolution (Correct answer)
Avoid all conflict
Escalate immediately to management
Ignore stakeholder concerns

Correct answer: Address issues professionally through active listening, finding common ground, and seeking resolution

This is fundamental to Spring Cloud practice. Address issues professionally through active listening, finding common ground, and seeking resolution represents the professional standard for communication in the Spring Cloud certification framework.

Question 12: Which Spring Cloud Gateway predicate routes requests where the path matches `/api/orders/**`?

Route=/api/orders/**
Path=/api/orders/** (Correct answer)
Match=/api/orders/**
PathVariable=/api/orders/**

Correct answer: Path=/api/orders/**

The Path predicate factory in Spring Cloud Gateway routes requests whose URI path matches the specified Ant-style pattern.

Question 13: How does Spring Cloud Kubernetes perform service discovery within a Kubernetes cluster?

It deploys its own Eureka server inside the cluster
It queries the Kubernetes API server for Services and Endpoints (Correct answer)
It uses DNS-SD records published by CoreDNS
It reads environment variables injected by the kubelet

Correct answer: It queries the Kubernetes API server for Services and Endpoints

Spring Cloud Kubernetes uses the Kubernetes API server to discover services and their endpoints, enabling native Kubernetes-based service discovery.

Question 14: Which Spring Cloud project provides service discovery support using HashiCorp Consul?

Spring Cloud Zookeeper
Spring Cloud Kubernetes
Spring Cloud Consul (Correct answer)
Spring Cloud Netflix

Correct answer: Spring Cloud Consul

Spring Cloud Consul integrates with HashiCorp Consul for service discovery, distributed configuration, and health checking.

Question 15: In Spring Cloud Config, what HTTP endpoint is used to trigger a configuration refresh on a specific service instance?

/actuator/refresh (Correct answer)
/spring/refresh
/config/reload
/actuator/restart

Correct answer: /actuator/refresh

POSTing to /actuator/refresh causes the application context to re-bind @ConfigurationProperties and @Value fields from the config server.

Question 16: What annotation is used to enable a Spring Boot application to act as a Eureka Server?

@EnableEurekaServer (Correct answer)
@EnableServiceRegistry
@EnableDiscoveryClient
@EnableEurekaClient

Correct answer: @EnableEurekaServer

@EnableEurekaServer placed on the main application class activates the Eureka Server auto-configuration.

Question 17: What is the purpose of the `spring.application.name` property in a Spring Cloud microservice?

Acts as the service ID used for registration and discovery (Correct answer)
Sets the JVM process name
Defines the HTTP server port
Configures the log file name

Correct answer: Acts as the service ID used for registration and discovery

spring.application.name serves as the virtual hostname and service ID under which the application registers with the discovery server.

Question 18: Which library replaced Hystrix as the recommended circuit breaker in Spring Cloud after Netflix put Hystrix in maintenance mode?

Sentinel
Istio
Resilience4j (Correct answer)
Envoy

Correct answer: Resilience4j

Resilience4j became the recommended circuit breaker library in Spring Cloud after Netflix officially put Hystrix into maintenance mode.

Question 19: What is the function of the `CircuitBreakerGatewayFilter` in Spring Cloud Gateway?

It blocks traffic when the gateway CPU exceeds 90%
It tracks error rates per route and adjusts routing weights dynamically
It wraps downstream calls with a circuit breaker to handle failures and trigger fallbacks (Correct answer)
It monitors gateway memory and restarts when it exceeds a threshold

Correct answer: It wraps downstream calls with a circuit breaker to handle failures and trigger fallbacks

The CircuitBreakerGatewayFilter integrates a circuit breaker (e.g., Resilience4j) into the gateway routing pipeline, enabling fallback URIs when downstream services fail.

Question 20: Evidence from chaos engineering experiments on Spring Cloud applications shows that which experiment most reliably exposes hidden single points of failure?

Killing the lowest-traffic service instance
Rebooting the build server during peak hours
Enabling debug logging on all services during peak traffic
Injecting network latency between a high-fan-out service and all its downstream dependencies simultaneously (Correct answer)

Correct answer: Injecting network latency between a high-fan-out service and all its downstream dependencies simultaneously

Simultaneously degrading all dependencies of a high-fan-out service reveals whether timeout budgets, fallbacks, and circuit breakers collectively prevent user-visible failure.

Question 21: When does a Resilience4j circuit breaker enter the Half-Open state?

During initial circuit breaker startup
After the waitDurationInOpenState has elapsed while the circuit is Open (Correct answer)
When exactly 50% of requests are failing
When the fallback method is partially active

Correct answer: After the waitDurationInOpenState has elapsed while the circuit is Open

After waiting in Open state for waitDurationInOpenState duration, the circuit breaker transitions to Half-Open to allow probe calls and test if the downstream service has recovered.

Question 22: A team deploys Config Server with encryption enabled. A downstream service receives a raw {cipher}... value and cannot decrypt it. What is the most likely cause?

The service is missing spring.cloud.config.decrypt=false
Eureka is not propagating the encryption key to service instances
The Git backend does not support encrypted values
Config Server-side decryption is disabled or misconfigured, so the client receives raw cipher text it cannot decrypt (Correct answer)

Correct answer: Config Server-side decryption is disabled or misconfigured, so the client receives raw cipher text it cannot decrypt

By default Config Server decrypts values before sending them; if spring.cloud.config.server.encrypt.enabled=false is set or the key is misconfigured, clients receive raw cipher text they can't decrypt.

Question 23: Which Spring Cloud Config Server backend stores configuration in a relational database rather than Git?

Database backend (spring.cloud.config.server.db)
SQL backend (spring.cloud.config.server.sql)
RDBMS backend (spring.cloud.config.server.rdbms)
JDBC backend (spring.cloud.config.server.jdbc) (Correct answer)

Correct answer: JDBC backend (spring.cloud.config.server.jdbc)

The JDBC backend allows Config Server to store and retrieve configuration from a relational database using a PROPERTIES table, configured via spring.cloud.config.server.jdbc.

Question 24: What does the `@LoadBalanced` annotation do when applied to a RestTemplate bean in Spring Cloud?

Intercepts requests to resolve logical service names via the discovery client (Correct answer)
Enables connection pooling for HTTP connections
Adds retry logic on HTTP 5xx responses
Enables circuit breaking on all requests

Correct answer: Intercepts requests to resolve logical service names via the discovery client

@LoadBalanced marks a RestTemplate so that a LoadBalancerInterceptor is applied, translating service names like http://my-service/api into real IP/port using the discovery client.

Question 25: What does the 'slidingWindowSize' property control in a Resilience4j circuit breaker configuration?

The timeout duration for each individual request
The number of recent calls analyzed to calculate the failure rate (Correct answer)
The maximum size of the thread pool
The interval between retry attempts

Correct answer: The number of recent calls analyzed to calculate the failure rate

slidingWindowSize defines how many recent calls (COUNT_BASED) or seconds (TIME_BASED) are used to calculate the failure rate for circuit breaker decisions.

Question 26: What is the purpose of the 'permittedNumberOfCallsInHalfOpenState' property in Resilience4j?

It controls the number of retry attempts in degraded mode
It limits request concurrency while the circuit initializes
It defines how many probe calls are allowed through when the circuit is testing recovery in Half-Open state (Correct answer)
It sets the maximum thread count during service recovery

Correct answer: It defines how many probe calls are allowed through when the circuit is testing recovery in Half-Open state

permittedNumberOfCallsInHalfOpenState controls how many test requests are sent through in Half-Open state to determine if the downstream service has recovered.

Question 27: What are the three states a circuit breaker cycles through in the circuit breaker pattern?

Running, Stopped, Paused
Active, Inactive, Pending
Closed, Open, Half-Open (Correct answer)
Enabled, Disabled, Testing

Correct answer: Closed, Open, Half-Open

A circuit breaker transitions between Closed (normal operation), Open (rejecting calls after failures), and Half-Open (testing recovery) states.

Question 28: How does Resilience4j support sharing a base configuration across multiple circuit breaker instances?

By extending a parent Spring bean definition
By importing a shared YAML anchor into each instance block
By using separate Spring profiles per circuit breaker instance
By defining a 'default' configuration that other instances inherit via the baseConfig property (Correct answer)

Correct answer: By defining a 'default' configuration that other instances inherit via the baseConfig property

Resilience4j supports a 'default' configuration entry; other instances reference it with baseConfig: default to inherit its settings and override only specific properties.

Question 29: In Eureka's self-preservation mode, what triggers the server to stop evicting instances?

Network latency exceeds 500ms
More than 10 instances are registered
CPU usage exceeds 80%
Received heartbeats fall below the expected threshold (Correct answer)

Correct answer: Received heartbeats fall below the expected threshold

Eureka activates self-preservation mode when the percentage of received heartbeats drops below the expected threshold, preventing mass eviction during network partitions.

Question 30: What is the purpose of a 'Filter' in Spring Cloud Gateway?

Discovering available routes from the service registry
Selecting which downstream instance receives a request
Modifying the incoming request or outgoing response before/after routing (Correct answer)
Caching responses from downstream services

Correct answer: Modifying the incoming request or outgoing response before/after routing

Filters in Spring Cloud Gateway can inspect and modify HTTP requests and responses, enabling cross-cutting concerns like authentication, logging, and header manipulation.

Question 31: What does the @RateLimiter annotation control when applied to a method in Resilience4j?

The speed of database read operations
The network bandwidth consumed per request
The CPU utilization threshold per service instance
The number of calls allowed within a configured time window (Correct answer)

Correct answer: The number of calls allowed within a configured time window

@RateLimiter restricts how many calls can be made to the annotated method within a defined time period, preventing downstream overload.

Question 32: What is the purpose of the `RewritePath` filter in Spring Cloud Gateway?

Converts query parameters to path variables
Rewrites HTTP headers to match downstream service expectations
Transforms the request URI path using a regex pattern before forwarding (Correct answer)
Rewrites the hostname of the downstream service URL

Correct answer: Transforms the request URI path using a regex pattern before forwarding

The RewritePath filter uses a regex replacement to transform the incoming request path into a new path before the request is forwarded to the downstream service.

VMware Spring Professional Develop (Spring Cloud)

Validates expertise in Spring Cloud microservices development, covering service discovery, API gateway routing, circuit breaker resilience patterns, and distributed configuration management using the Spring ecosystem.

Questions

35 min

Time Limit

76%

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