Spring Boot Java: Practical Concepts Quiz
Medium-difficulty multiple-choice quiz testing practical Spring Boot architecture, configuration, and common pitfalls.
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Quiz Questions & Answers
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Question 1: What is the primary purpose of the @SpringBootApplication annotation?
Generates client SDKs for REST APIs
Automatically deploys the app to a cloud provider
Replaces Spring MVC for building web endpoints
Combines @Configuration, @EnableAutoConfiguration, and @ComponentScan to bootstrap the app
Question 2: When should you prefer constructor injection over field injection in Spring Boot?
When the bean requires lazy initialization at runtime
To enable field-level AOP proxies automatically
When you want immutable dependencies and easier unit testing
Only for prototype-scoped beans to avoid memory leaks
Question 3: What advantage does Spring Boot's starter dependency pattern provide?
It groups compatible libraries and sensible defaults so you avoid manual dependency selection
They replace the need for build tools like Maven or Gradle
They automatically convert monoliths into microservices
They enforce compile-time validation for REST contracts
Question 4: If an application property needs to vary by environment, which Spring Boot feature is best suited?
Use static constants in a utility class loaded during startup
Hard-code values in @Value annotations and override at runtime
Store all settings in a single application.properties and parse them manually
Use profiles (application-{profile}.properties or YAML) to provide environment-specific settings
Question 5: Which approach best prevents blocking the HTTP request thread during long-running tasks?
Increase server thread pool to handle more concurrent blocking requests
Rely on the garbage collector to pause and resume long tasks
Run the task asynchronously (e.g., @Async or publish to a message queue) and return a quick response
Use synchronous REST calls with larger request timeouts
Question 6: How does Spring Boot's auto-configuration decide to configure a bean?
It always creates all possible beans declared in the framework
It requires a runtime license key to enable configuration
It checks classpath presence, existing user beans, and configuration properties before adding defaults
It only configures beans when an explicit XML file is provided
Question 7: What is a common consequence of putting heavy logic inside a @Controller method?
Controllers become hard to test and the app violates single-responsibility, making maintenance difficult
The framework automatically moves logic to service layer at runtime
It prevents the application from packing into an executable jar
It improves performance because controllers run in the web thread
Question 8: Which testing practice gives the best trade-off between speed and realistic behavior for Spring Boot services?
Use slice tests (e.g., @WebMvcTest or @DataJpaTest) plus unit tests to test layers in isolation
Only use mocks without any Spring context to guarantee correctness
Rely only on full integration tests for every change to maximize accuracy
Manual QA testing replaces the need for automated tests