Springboot MCQs with answers Page - 18

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Shyam Dubey • 3.70K Points
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Q. What does the @ConditionalOnProperty annotation do?

• (A) Loads a bean based on the presence of a system property
• (B) Loads properties conditionally at runtime
• (C) Loads a configuration class based on the property value
• (D) Disables a bean if a property is missing

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Correct answer - Option (C)

Explanation:

@ConditionalOnProperty is used to conditionally load a configuration based on the presence or value of a property.

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Shyam Dubey • 3.70K Points
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Q. Which annotation is used to prevent a bean from being created automatically?

• (A) @Bean(false)
• (B) @DisableAutoCreate
• (C) @Conditional(false)
• (D) @ConditionalOnMissingBean

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Correct answer - Option (D)

Explanation:

@ConditionalOnMissingBean prevents the bean from being created if another bean of the same type is already defined.

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Shyam Dubey • 3.70K Points
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Q. Which annotation allows you to create a new thread-safe service layer class?

• (A) @Service
• (B) @Repository
• (C) @ThreadSafe
• (D) @Component

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Correct answer - Option (A)

Explanation:

@Service marks a class as a service provider, typically used in the business logic layer.

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Shyam Dubey • 3.70K Points
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Q. Which annotation is used to log method execution time using Spring AOP?

• (A) @LogTime
• (B) @ExecutionLogger
• (C) @Around
• (D) @TimeTrack

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Correct answer - Option (C)

Explanation:

@Around is used in Aspect-Oriented Programming (AOP) to execute custom logic before and after method execution.

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Shyam Dubey • 3.70K Points
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Q. What is the default format of application.yml file?

• (A) XML
• (B) JSON
• (C) YAML
• (D) Plain Text

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Correct answer - Option (C)

Explanation:

application.yml is a YAML file used for configuration in Spring Boot.

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Shyam Dubey • 3.70K Points
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Q. Which annotation can be used to perform data validation on fields?

• (A) @Validate
• (B) @Assert
• (C) @Valid
• (D) @Check

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Correct answer - Option (C)

Explanation:

@Valid is used to trigger validation on the annotated field or parameter.

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Shyam Dubey • 3.70K Points
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Q. What does the property spring.jpa.hibernate.ddl-auto=update do?

• (A) Disables table creation
• (B) Drops all tables
• (C) Updates the schema without destroying data
• (D) Deletes all rows from tables

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Correct answer - Option (C)

Explanation:

spring.jpa.hibernate.ddl-auto=update updates the database schema without deleting data.

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Shyam Dubey • 3.70K Points
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Q. Which of the following is used to define a global exception handler?

• (A) @RestControllerAdvice
• (B) @ExceptionGlobal
• (C) @GlobalErrorHandler
• (D) @ExceptionCatch

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Correct answer - Option (A)

Explanation:

@RestControllerAdvice is used for global exception handling in REST APIs.

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Shyam Dubey • 3.70K Points
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Q. Which file extension is valid for external Spring configuration files?

• (A) .xml
• (B) .config
• (C) .properties
• (D) .txt

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Correct answer - Option (C)

Explanation:

.properties and .yml/.yaml are the standard formats for external Spring configuration.

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Shyam Dubey • 3.70K Points
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Q. Which annotation is used for mapping POST requests in Spring Boot?

• (A) @PostMapping
• (B) @PostRequest
• (C) @POST
• (D) @PostAPI

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Correct answer - Option (A)

Explanation:

@PostMapping is used to map HTTP POST requests onto specific handler methods.

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