Spring Boot Senior Engineer Assessment

Q: What is this java-spring-boot mock test?

This is a comprehensive java-spring-boot mock test with 25 questions covering Auto-Configuration, Configuration, Conditional Configuration. It simulates real technical interviews with timed conditions and provides detailed explanations.

Q: How long does the test take?

The test has a time limit of 90 minutes. You can pause and resume, but we recommend completing it in one sitting.

Q: Will I get feedback on my answers?

Yes! After each question, you receive immediate feedback with detailed explanations. At the end, you get a comprehensive report showing your strengths and areas for improvement.

Q: Is this test suitable for FAANG interview preparation?

Absolutely! Our questions are curated by FAANG interviewers and cover the exact topics and difficulty levels you'll encounter in top tech company interviews.

Question 1

What is the mechanism behind Spring Boot's auto-configuration and how does @ConditionalOnMissingB...

Answer

Auto-configuration uses spring.factories files; @ConditionalOnMissingBean only creates a bean if no other bean of same type exists in context, allowing custom overrides

Question 2

What is the difference between @ComponentScan and @EntityScan in Spring Boot?

Answer

@ComponentScan scans Spring-managed beans (@Component, @Service, @Repository); @EntityScan scans JPA entities (@Entity) for EntityManagerFactory creation

Question 3

What is the purpose of @ConditionalOnClass and @ConditionalOnMissingClass annotations?

Answer

To conditionally create beans based on presence or absence of specific classes in the classpath (e.g., DataSource if HikariCP is present)

Question 4

How does Spring Boot determine which DataSource to use when multiple are present (e.g., H2, Postg...

Answer

It uses spring.datasource.url prefix to detect driver (jdbc:h2:, jdbc:postgresql:, etc.) and auto-configures the matching one

Question 5

What is the difference between @Transactional with Propagation.REQUIRED vs Propagation.REQUIRES_NEW?

Answer

REQUIRED joins existing transaction or creates new; REQUIRES_NEW always suspends current transaction and starts new independent one

Question 6

What is the difference between @Transactional on public vs private methods in Spring?

Answer

@Transactional only works on public methods because Spring AOP uses proxies (JDK dynamic proxies or CGLIB) which cannot intercept private methods

Question 7

How would you implement a custom Spring Boot Starter?

Answer

Create a module with auto-configuration class, spring.factories file, and optional @ConfigurationProperties

Question 8

What is the purpose of @ConfigurationProperties validation using JSR-303 annotations?

Answer

To validate property values at application startup (e.g., @NotNull, @Min, @Max on configuration fields) using @Validated

Question 9

What is the difference between @MockBean and @MockitoBean (Spring Boot 3.4+)?

Answer

@MockBean replaces real bean with Mockito mock; @MockitoBean is similar but integrates better with Spring Boot 3.4+ test slice improvements

Question 10

What is a 'Slice Test' in Spring Boot (e.g., @DataJpaTest, @WebMvcTest, @JsonTest)?

Answer

A test that loads only a specific part of the application context (JPA, MVC, JSON) for faster, focused integration tests

Spring Boot Senior Engineer Assessment

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