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Blog Quizzes Spring Boot MCQs (Quiz)

Spring Boot MCQs (Quiz)

By: Vaibhav Joshi

Last Updated: September 22nd, 2026

Read Time: 30:00 Minutes

1. Spring Boot Fundamentals

2. Spring Boot Project Configuration

3. Dependency Injection and IoC

4. Bean Lifecycle and Scopes

5. Web and REST APIs

6. Validation and Exception Handling

7. Data Access with Spring Data JPA

8. Transactions and Persistence

9. Spring Security

10. Actuator and Production Monitoring

11. Testing Spring Boot Applications

12. Messaging and Event-Driven Spring Boot

13. Microservices and Distributed Systems

14. Deployment, Containers and Cloud

15. Advanced and Scenario-Based Spring Boot

16. Your Quiz Result

Preparing for a Spring Boot interview or Java development role? This collection of Spring Boot MCQs is a practical resource for testing your knowledge of Spring Boot fundamentals, auto-configuration, dependency injection, REST APIs, validation, Spring Data JPA, transactions, security, Actuator, testing, caching, messaging, microservices, scheduling, deployment, and real-world Spring Boot scenarios.

Note: Score 60% or higher to unlock an exclusive offer of up to 50% off on self-paced Spring Boot courses.

Let’s begin!

Spring Boot Fundamentals

1. What is Spring Boot primarily designed to do?

A) Simplify building and running Spring applications with sensible defaults
B) Replace the Java language
C) Provide only a database engine
D) Eliminate all dependency management

2. Which annotation is commonly used on a Spring Boot application entry class?

A) @SpringEntity
B) @BootApplicationOnly
C) @SpringMain
D) @SpringBootApplication

3. What does @SpringBootApplication combine?

A) @RestController, @RequestMapping, and @GetMapping
B) @Entity, @Table, and @Id
C) @Configuration, @EnableAutoConfiguration, and @ComponentScan
D) @Bean, @Service, and @Repository

4. What is Spring Boot auto-configuration intended to provide?

A) Automatic cloud deployment only
B) Automatic configuration based on the application classpath and properties
C) Automatic database backups
D) Automatic source-code generation for every class

5. What is a Spring Boot starter?

A) A dependency descriptor that brings together commonly needed libraries
B) A Java compiler plugin
C) A production server
D) A database schema

6. Which embedded server is commonly used by Spring Boot web applications by default with the servlet stack?

A) Apache HTTP Server
B) Nginx
C) IIS
D) Tomcat

7. What is the main benefit of an embedded server?

A) It replaces Java
B) It stores application data permanently
C) The application can run as a self-contained executable without separately installing an application server
D) It removes HTTP

8. Which command commonly runs a Maven-based Spring Boot application?

A) java mvn boot
B) mvn spring-boot:run
C) mvn boot:start-server
D) spring run mvn

9. What does SpringApplication.run typically do?

A) Bootstraps the Spring application context and starts the application
B) Creates a database table
C) Compiles CSS
D) Deletes temporary files

10. Which packaging style is commonly used for a deployable Spring Boot application?

A) Only ZIP with no classes
B) Database dump
C) HTML file
D) Executable JAR

Spring Boot Project Configuration

11. Which file is commonly used for Spring Boot configuration in YAML format?

A) spring.config.java
B) server.yaml.xml
C) application.yml
D) boot.yml only

12. Which property sets the HTTP server port?

A) boot.server.listen
B) server.port
C) http.listen
D) spring.http.portOnly

13. What is the purpose of application.properties?

A) To define configurable application settings
B) To store Java bytecode
C) To define database tables only
D) To replace pom.xml

14. What does Spring Boot support for externalized configuration?

A) Only hard-coded constants
B) Only XML files
C) Only Java system classes
D) Properties, YAML, environment variables, command-line arguments, and other property sources

15. What is a profile in Spring?

A) A database index
B) A Maven repository
C) A way to activate environment-specific bean and configuration definitions
D) A user login role

16. Which property activates a Spring profile?

A) boot.profile.use
B) spring.profiles.active
C) spring.profile.start
D) spring.active.environment

17. What is @Value commonly used for?

A) Injecting a configuration property value into a bean
B) Creating an HTTP endpoint
C) Opening a database transaction
D) Defining an entity ID

18. What is @ConfigurationProperties useful for?

A) Creating database indexes
B) Rendering HTML
C) Starting a JVM
D) Binding groups of external configuration properties to a typed object

19. Why should secrets generally not be hard-coded in application.properties committed to source control?

A) They slow down startup
B) They disable auto-configuration
C) They can be exposed to anyone with access to the repository
D) Spring Boot cannot read them

20. What does configuration precedence help determine?

A) Which Java class compiles first
B) Which property source wins when the same setting is defined in multiple places
C) Which controller handles a request
D) Which database row is deleted

Dependency Injection and IoC

21. What is dependency injection?

A) Providing an object with the dependencies it needs rather than having it construct them itself
B) Encrypting dependencies
C) Downloading JARs at runtime only
D) Replacing interfaces with classes

22. What does IoC mean in Spring?

A) Input over Compilation
B) Internet of Controllers
C) Instance of Configuration
D) Inversion of Control, where the container manages object creation and wiring

23. Which annotation commonly marks a class as a service component?

A) @BusinessBean
B) @Logic
C) @Service
D) @InjectServiceOnly

24. Which annotation commonly marks a repository component?

A) @Persist
B) @Repository
C) @DataStoreOnly
D) @DatabaseBean

25. Which annotation is commonly used for a generic Spring-managed component?

A) @Component
B) @ManagedClassOnly
C) @SpringObject
D) @ContainerType

26. What is constructor injection?

A) Reading dependencies from HTTP headers
B) Injecting values through SQL
C) Creating dependencies in a static block
D) Passing required dependencies through a class constructor

27. Why is constructor injection often preferred for required dependencies?

A) It disables testing
B) It requires XML configuration
C) It makes dependencies explicit and supports immutable fields
D) It always creates more database connections

28. What happens when multiple beans match a dependency and no disambiguation exists?

A) The JVM ignores the dependency
B) Spring can report an ambiguity such as NoUniqueBeanDefinitionException
C) Spring randomly chooses one
D) Spring deletes both beans

29. Which annotation can designate a preferred bean when multiple candidates exist?

A) @Primary
B) @PreferredBeanOnly
C) @Default
D) @MainBean

30. Which annotation can select a specific bean by qualifier?

A) @BeanNameOnly
B) @SelectComponent
C) @InjectByTypeOnly
D) @Qualifier

Bean Lifecycle and Scopes

31. What is a Spring bean?

A) A database row
B) A Maven artifact only
C) An object managed by the Spring IoC container
D) Any Java primitive

32. What is the default Spring bean scope?

A) session
B) singleton
C) prototype
D) request

33. What does prototype scope mean?

A) A new bean instance is created when the bean is requested from the container
B) One instance is shared forever
C) One instance per HTTP session only
D) The bean is never created

34. Which annotation can define a bean-producing method inside a configuration class?

A) @CreateObject
B) @ManagedMethod
C) @SpringFactoryOnly
D) @Bean

35. What is @PostConstruct commonly used for?

A) Opening a new database
B) Changing the Java version
C) Running initialization logic after dependency injection is completed
D) Handling HTTP errors

36. What is @PreDestroy commonly used for?

A) Loading a Maven dependency
B) Running cleanup logic before a managed bean is destroyed
C) Validating request JSON
D) Creating a REST route

37. What does bean lazy initialization mean?

A) Beans are created when needed rather than all at startup
B) Beans are never created
C) Beans are created on every method call
D) Beans are stored in the browser

38. Which property enables lazy initialization globally?

A) spring.beans.lazy-all
B) boot.lazy.enabled-only
C) spring.container.defer
D) spring.main.lazy-initialization

39. What is a circular dependency?

A) A request has two headers
B) A JAR has two versions
C) Bean A depends on B while B directly or indirectly depends on A
D) Two database tables have different names

40. Why can circular dependencies be problematic?

A) They automatically create transactions
B) The container may be unable to construct the involved beans cleanly
C) They always improve performance
D) They disable HTTP

Web and REST APIs

41. Which annotation is commonly used for a REST controller?

A) @RestController
B) @WebServiceOnly
C) @ApiControllerOnly
D) @HttpBean

42. What does @GetMapping map?

A) HTTP POST requests only
B) Database SELECT statements only
C) WebSocket frames only
D) HTTP GET requests

43. What does @PostMapping map?

A) JDBC connections
B) Scheduled jobs
C) HTTP POST requests
D) HTTP GET requests

44. What does @PathVariable bind?

A) A request cookie only
B) A value from the URI path
C) A value from a SQL result
D) A configuration profile

45. What does @RequestParam commonly bind?

A) A query-string parameter
B) A database entity
C) A Java package
D) A response header only

46. What does @RequestBody typically do?

A) Reads a URL path segment
B) Creates a database table
C) Sets the server port
D) Binds the HTTP request body to a Java object

47. What does ResponseEntity allow a controller to control?

A) Only application logging
B) Only JVM memory
C) HTTP status, headers, and response body
D) Only database schema

48. Which HTTP status commonly represents successful resource creation?

A) 500 Internal Server Error
B) 201 Created
C) 200 Only
D) 301 Moved Permanently

49. Which annotation can define a base path for controller methods?

A) @RequestMapping
B) @BaseUrlOnly
C) @ControllerPath
D) @HttpPrefix

50. What is content negotiation?

A) Choosing a database vendor
B) Selecting a Java compiler
C) Choosing a Spring profile only
D) Selecting a representation such as JSON based on request and server capabilities

Validation and Exception Handling

51. Which annotation is commonly used to validate a request object in a controller?

A) @ValidateJsonOnly
B) @VerifyBean
C) @Valid
D) @CheckRequestOnly

52. What is Bean Validation used for?

A) Compiling Java code
B) Declaring and checking constraints on object fields or method parameters
C) Managing database transactions
D) Starting embedded servers

53. Which annotation commonly requires a string to contain non-whitespace characters?

A) @NotBlank
B) @RequiredTextOnly
C) @TextPresent
D) @StringCheck

54. Which annotation commonly requires a numeric value to be within a range?

A) @NumberRangeOnly
B) @BetweenValue
C) @NumericLimitOnly
D) @Min or @Max

55. What is @ControllerAdvice commonly used for?

A) Running scheduled tasks
B) Loading static files
C) Cross-controller concerns such as centralized exception handling
D) Creating database indexes

56. What does @ExceptionHandler define?

A) A scheduled job
B) A method that handles specified exceptions
C) A database connection pool
D) A security role

57. What should a REST API generally return for malformed input?

A) An appropriate 4xx response with useful error details
B) Always 200 OK
C) Always 500 Internal Server Error
D) Always 302 Redirect

58. Why use a consistent API error response format?

A) It increases JVM heap automatically
B) It disables validation
C) It removes logging
D) Clients can handle errors predictably

59. What is MethodArgumentNotValidException commonly associated with?

A) JVM startup failures
B) Missing Maven plugins
C) Validation failures on method arguments in web requests
D) Database connection failures

60. Why should stack traces generally not be returned directly to API clients in production?

A) They are required by HTTP
B) They may expose implementation details or sensitive information
C) They make JSON valid
D) They improve authentication

Data Access with Spring Data JPA

61. What does Spring Data JPA primarily simplify?

A) Repository-based data access using JPA
B) HTML rendering only
C) Network routing
D) Java compilation

62. Which annotation marks a JPA entity class?

A) @JpaModelOnly
B) @DatabaseEntityOnly
C) @PersistClass
D) @Entity

63. Which annotation identifies an entity primary key?

A) @KeyColumnOnly
B) @EntityIdOnly
C) @Id
D) @PrimaryKeyOnly

64. What is JpaRepository commonly used for?

A) Managing Maven builds
B) Providing CRUD and repository operations for JPA entities
C) Configuring HTTP ports
D) Creating controllers

65. What is a derived query method?

A) A repository method whose name is parsed to create a query
B) A query stored only in a database trigger
C) A SQL query generated by the compiler
D) A REST endpoint generated by Tomcat

66. What does @Query allow in a repository?

A) Defining an HTTP filter only
B) Defining a Maven profile
C) Defining a JVM option
D) Defining a custom JPQL or native query

67. What is lazy fetching?

A) Caching every query forever
B) Loading all tables at startup
C) Loading an associated entity or collection when it is accessed rather than immediately
D) Deleting unused rows

68. What is the N+1 query problem?

A) A transaction with one statement
B) One query loads parent data and many additional queries load related data
C) A failed network request
D) A database with exactly 11 rows

69. What does @Transactional provide?

A) Declarative transaction management around method execution
B) Automatic API documentation
C) HTTP compression
D) Password hashing

70. Why can Open Session in View be controversial?

A) It disables all JPA queries
B) It prevents transactions
C) It removes database connections
D) It can allow lazy loading during web rendering and may hide inefficient data access patterns

Transactions and Persistence

71. What is the main purpose of a database transaction?

A) Create HTTP endpoints
B) Manage Java threads only
C) Group operations into a unit with defined consistency behavior
D) Compress database files

72. What does transaction rollback do?

A) Restarts the JVM
B) Undoes changes made within the transaction according to transaction semantics
C) Commits all changes twice
D) Deletes the database

73. What does transaction propagation describe?

A) How a method participates in an existing or new transaction
B) How HTTP headers propagate
C) How logs are copied
D) How beans are scanned

74. What does READ_COMMITTED isolation generally prevent?

A) All possible concurrency anomalies
B) All deadlocks
C) All duplicate rows
D) Reading data committed by other transactions while allowing some other phenomena

75. What is a dirty read?

A) Reading a cached object
B) Reading a JSON request
C) Reading uncommitted data from another transaction
D) Reading an indexed row

76. What is optimistic locking?

A) Using only database passwords
B) Detecting conflicting updates using a version or similar mechanism rather than locking rows throughout the transaction
C) Always locking every row
D) Disabling transactions

77. Which JPA annotation is commonly used for version-based optimistic locking?

A) @Version
B) @LockVersionOnly
C) @OptimisticOnly
D) @RevisionField

78. What is pessimistic locking?

A) Using no database locks
B) Using only cache entries
C) Using HTTP authentication
D) Using database locking to prevent or restrict concurrent conflicting access

79. Why should transaction boundaries be chosen carefully?

A) They determine Java syntax
B) They change HTML rendering
C) They affect consistency, locking, performance, and resource usage
D) They only affect URL routing

80. What is a common reason a @Transactional method may not behave as expected when called from the same class?

A) Tomcat blocks internal calls
B) Self-invocation can bypass the Spring proxy that applies transaction advice
C) Transactions require XML only
D) JPA ignores annotations

Spring Security

81. What are authentication and authorization?

A) Authentication verifies identity; authorization determines permitted access
B) Both mean password encryption
C) Both mean database indexing
D) Authentication creates beans and authorization destroys them

82. What is Spring Security primarily used for?

A) Managing database schemas
B) Compiling Java
C) Serving static CSS only
D) Securing applications and controlling access to resources

83. What is a SecurityFilterChain used for?

A) Creating Maven dependencies
B) Configuring database indexes
C) Defining web security behavior through a chain of security filters
D) Managing JPA entities

84. What is CSRF protection intended to mitigate?

A) DNS failures
B) Certain forged state-changing requests made using an authenticated browser context
C) SQL syntax errors
D) JVM memory leaks

85. When is CSRF protection especially relevant?

A) Browser-based applications using cookies for authentication
B) Stateless services using only non-browser bearer tokens in appropriate designs
C) Offline batch jobs only
D) Database migrations only

86. What is a PasswordEncoder used for?

A) Encrypting HTTP headers reversibly
B) Generating JWT claims only
C) Creating database indexes
D) Safely hashing passwords for storage and verification

87. Why should passwords not be stored as plaintext?

A) Plaintext is slower to read
B) HTTP forbids plaintext database values
C) A database compromise would directly reveal user credentials
D) Spring Boot cannot query plaintext

88. What is a JWT commonly used for?

A) Starting Tomcat
B) Representing signed claims that can be used for stateless authentication or authorization
C) Replacing SQL
D) Creating Java classes

89. What does method security control?

A) Authorization at the method or service layer
B) Only HTTP compression
C) Only database backups
D) Only logging levels

90. Why should authorization checks be enforced server-side?

A) Browsers always enforce business rules
B) It eliminates authentication
C) It makes all endpoints public
D) Clients cannot be trusted to enforce access rules themselves

Actuator and Production Monitoring

91. What is Spring Boot Actuator?

A) A Java compiler
B) A frontend framework
C) A set of production-oriented endpoints and features for monitoring and management
D) A database driver

92. Which endpoint commonly exposes application health information?

A) /boot/healthz-only
B) /actuator/health
C) /healthcheck/java
D) /spring/status-only

93. What is /actuator/info commonly used for?

A) Exposing application information configured for the info endpoint
B) Executing SQL
C) Changing passwords
D) Creating beans

94. Why should Actuator endpoints be secured?

A) They cannot run without passwords
B) They are only used in tests
C) They replace TLS
D) Some endpoints can expose operational or sensitive information

95. What is Micrometer commonly used with Spring Boot for?

A) HTML templating
B) Dependency resolution
C) Application metrics instrumentation and collection
D) Database schema generation

96. What is a liveness probe intended to indicate?

A) Whether a user is authenticated
B) Whether an application instance should be considered alive
C) Whether every dependency is healthy
D) Whether a database row exists

97. What is a readiness probe intended to indicate?

A) Whether an instance is ready to receive traffic
B) Whether the JVM is installed
C) Whether logs are compressed
D) Whether code is compiled

98. What is observability commonly composed of?

A) Only passwords
B) Only database tables
C) Only HTTP methods
D) Logs, metrics, and traces

99. Why are correlation IDs useful?

A) They replace authentication
B) They create database keys
C) They help trace a request across logs and services
D) They encrypt passwords

100. What is a custom Actuator endpoint used for?

A) Changing the JVM vendor
B) Exposing controlled application-specific operational information or actions
C) Replacing every REST controller
D) Compiling source code

Testing Spring Boot Applications

101. Which annotation is commonly used to load a full Spring Boot application context in a test?

A) @SpringBootTest
B) @BootFullTestOnly
C) @SpringContextAll
D) @LoadSpringOnly

102. What is a unit test generally intended to isolate?

A) The entire production environment
B) A complete Kubernetes cluster
C) A real payment gateway
D) A small unit of behavior with minimal external dependencies

103. What is @WebMvcTest commonly used for?

A) Running production deployment
B) Testing Maven itself
C) Testing Spring MVC controllers with a focused web slice
D) Testing every database table

104. What is @DataJpaTest intended to focus on?

A) Messaging brokers only
B) JPA repositories and persistence-related components
C) Security filters only
D) REST controllers only

105. Why mock external services in many unit tests?

A) To isolate the unit and make tests deterministic and fast
B) To make production calls safer
C) To test the external service itself
D) To eliminate assertions

106. What is MockMvc used for?

A) Mocking database tables
B) Starting Kubernetes
C) Generating JPA entities
D) Testing Spring MVC request handling without requiring a real network server

107. What does an integration test generally verify?

A) Only Java syntax
B) Only CSS styles
C) How multiple components work together
D) Only a single getter

108. Why use test-specific configuration?

A) To disable test isolation
B) To provide controlled dependencies and settings for tests
C) To change production data automatically
D) To bypass all assertions

109. What is Testcontainers useful for?

A) Running real service dependencies such as databases in disposable containers during tests
B) Generating Java classes
C) Replacing JUnit assertions
D) Serving frontend assets

110. Why should integration tests avoid relying on shared mutable external state?

A) It makes tests faster
B) Spring requires it
C) HTTP requires it
D) Shared state can make tests flaky and order-dependent

Messaging and Event-Driven Spring Boot

111. What is Spring Kafka commonly used for?

A) Serving HTML templates
B) Compiling Java
C) Integrating Spring applications with Apache Kafka
D) Managing JPA entities

112. What is a Kafka topic?

A) An HTTP header
B) A named stream/category to which records are published and from which consumers can read
C) A database table only
D) A Spring bean scope

113. What is a Kafka consumer group?

A) A set of consumers that coordinate to process partitions of a topic
B) A set of database users
C) A Spring profile
D) A collection of REST controllers

114. What is Spring AMQP commonly used for?

A) Database indexing
B) JPA mapping
C) Frontend rendering
D) Messaging with AMQP brokers such as RabbitMQ

115. What is asynchronous processing useful for?

A) Replacing transactions
B) Eliminating failures
C) Moving work off the request thread when immediate completion is not required
D) Guaranteeing exactly-once behavior in every system

116. Which annotation can enable Spring asynchronous method execution?

A) @EnableThreadPoolOnly
B) @EnableAsync
C) @AsyncEnableOnly
D) @SpringAsyncStart

117. Which annotation marks a method for asynchronous execution?

A) @Async
B) @BackgroundOnly
C) @RunLater
D) @AsyncMethodOnly

118. Why can message consumers need idempotency?

A) Kafka never retries
B) It prevents all failures
C) It replaces serialization
D) A message may be delivered or processed more than once

119. What is a dead-letter queue commonly used for?

A) Caching HTTP responses
B) Replacing authentication
C) Holding messages that cannot be successfully processed after defined attempts
D) Storing successful database backups

120. What is event-driven architecture?

A) A CSS framework
B) A design where components react to published events rather than relying only on direct synchronous calls
C) A database-only design
D) A Java compiler feature

Microservices and Distributed Systems

121. What is Spring Cloud commonly associated with?

A) Patterns and tools for building distributed systems and microservices
B) Java primitive types
C) Database normalization only
D) Frontend styling

122. What is service discovery?

A) A way to discover Java syntax errors
B) A database backup strategy
C) A logging format
D) A mechanism for locating service instances dynamically

123. What is an API gateway commonly responsible for?

A) Compiling microservices
B) Creating entity classes
C) Routing client requests and applying cross-cutting concerns at the edge of services
D) Replacing every database

124. What is a circuit breaker intended to do?

A) Replace service discovery
B) Prevent repeated calls to a failing dependency and allow recovery
C) Encrypt traffic
D) Guarantee zero downtime

125. What is a timeout important for in distributed systems?

A) It prevents a caller from waiting indefinitely for a dependency
B) It guarantees success
C) It disables retries
D) It creates a transaction

126. What is a retry storm?

A) A Kafka partition
B) A database lock
C) A Spring profile
D) Excessive concurrent retries that can increase load on an already failing service

127. Why use distributed tracing?

A) To replace metrics
B) To compile services
C) To follow a request across multiple services and identify latency or failure points
D) To store passwords

128. What is eventual consistency?

A) A database backup
B) A model where replicas may temporarily differ but converge toward a consistent state
C) A guarantee of immediate global consistency
D) A Java annotation

129. Why should distributed operations not assume a single local transaction covers every service?

A) Separate services often have separate transactional resources
B) Spring forbids transactions
C) REST has no status codes
D) Kafka requires SQL

130. What is a saga pattern used for?

A) Compiling Java code
B) Caching static files
C) Creating database indexes
D) Coordinating a distributed business transaction through local transactions and compensating actions

Deployment, Containers and Cloud

131. What is a common way to containerize a Spring Boot application?

A) Store it only in a database
B) Run it without a JVM or compatible runtime
C) Build a container image containing the application and its runtime
D) Convert it to HTML

132. What is the purpose of a Dockerfile?

A) Create Kubernetes services automatically
B) Define instructions for building a container image
C) Define database transactions
D) Configure Spring beans only

133. Why use environment variables in container deployments?

A) They allow deployment-specific configuration without rebuilding the application image
B) They compile Java faster
C) They replace HTTP
D) They disable profiles

134. What is a Kubernetes readiness probe used for?

A) Restarting every healthy pod
B) Building a Docker image
C) Creating a Maven repository
D) Determining whether a pod is ready to receive traffic

135. What is a Kubernetes liveness probe used for?

A) Creating users
B) Compiling Java
C) Detecting whether a container should be restarted because it is unhealthy
D) Selecting database indexes

136. Why should container images be kept small?

A) Spring Boot rejects large images
B) Smaller images can reduce transfer time, storage use, and attack surface
C) Small images always run faster
D) Kubernetes requires exactly 10 MB

137. What is a graceful shutdown?

A) Allowing an application to finish or safely stop in-flight work before terminating
B) Deleting active requests immediately
C) Restarting the database
D) Disabling all logging

138. Why is externalized configuration important in cloud deployments?

A) It removes the need for code
B) It guarantees zero downtime
C) It replaces authentication
D) The same application artifact can run in multiple environments with different settings

139. What is horizontal scaling?

A) Adding more database columns
B) Increasing a Java class size
C) Running multiple application instances to handle more load
D) Increasing the RAM of one machine only

140. What is a health check used for?

A) Rendering HTML
B) Providing an operational signal about whether an application instance is functioning or ready
C) Changing passwords
D) Creating a Maven build

Advanced and Scenario-Based Spring Boot

141. An API is returning database entities directly and exposing internal fields. What is a safer design?

A) Use DTOs to control the API representation
B) Expose every entity field
C) Disable JSON serialization
D) Return database connections

142. A Spring Boot API becomes slow because a controller calls another service synchronously for every request. What should be investigated first?

A) Only CSS size
B) Only Java package names
C) Only Maven version
D) Dependency latency, timeouts, connection pools, and downstream call patterns

143. A service occasionally fails when its database is unavailable. Which design helps it fail predictably?

A) Hide all errors
B) Disable database connections
C) Use timeouts, appropriate exception handling, health checks, and resilience patterns
D) Retry forever immediately

144. Two beans implement the same interface and injection fails with an ambiguity error. What is a direct solution?

A) Disable component scanning
B) Use @Qualifier or designate one bean as @Primary
C) Delete the interface
D) Add another controller

145. A REST endpoint performs a long-running report generation. What architecture can improve user experience?

A) Submit the job asynchronously and provide a way to check or retrieve the result
B) Block the HTTP request indefinitely
C) Increase JSON size
D) Disable logging

146. A production application needs database credentials that differ by environment. What is appropriate?

A) Commit passwords to Git
B) Hard-code them in Java
C) Put them in public API responses
D) Externalize secrets through environment or secret-management mechanisms

147. A cache returns outdated product data after updates. What should be examined?

A) Java package naming
B) Tomcat version only
C) Cache invalidation and eviction behavior around writes
D) HTTP method names only

148. A controller has complex business logic and database calls. What refactoring is usually appropriate?

A) Remove dependency injection
B) Move business logic into a service layer and persistence logic into repositories
C) Put everything into the controller
D) Move SQL into HTML

149. A Spring Boot application has slow startup because many beans are initialized but rarely used. Which feature may help?

A) Lazy initialization, after evaluating its trade-offs
B) Disabling all beans
C) Removing configuration files
D) Using only static methods

150. A microservice repeatedly calls an unavailable dependency and overloads it further. Which pattern addresses this?

A) Infinite retries with no delay
B) Disable monitoring
C) Increase request payloads
D) Circuit breaker with suitable timeout and recovery behavior

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About the Author

Vaibhav Joshi

Vaibhav Joshi has written systems-level and application code in Java, C, and C++ over a career spanning enterprise software and performance-focused projects. Debugging memory issues and bottlenecks under real production load shapes his careful, detail-oriented writing. He tests language and compiler updates directly, helping programmers write efficient, maintainable code.

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