Spring Boot Interview Questions Freshers 2026

Spring Boot has become the default Java backend framework in India's placement circuit, TCS, Infosys, Wipro, and mid-tier product companies all test it in technical rounds. This guide covers every high-frequency concept, gives you real MCQs with working solutions, and includes 2026 salary benchmarks so you walk in knowing exactly what to expect.

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What Is Spring Boot and Why Do Freshers Get Asked About It

Spring Boot is an opinionated extension of the Spring Framework that eliminates boilerplate XML configuration. It bundles an embedded server (Tomcat/Jetty), auto-configuration, and production-ready metrics into a single deployable JAR. For freshers, it signals backend readiness faster than raw Spring MVC because interviewers can verify REST API knowledge, database integration, and project structure in one framework.

In 2026, nearly every Java-stack JD for freshers, whether it says "0-1 year" or "trainee engineer", lists Spring Boot as required or preferred. Service companies use it in internal tooling; product startups use it for microservices. Either way, you cannot skip it.

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2026 Salary Benchmarks, Spring Boot Freshers in India

The table below is based on verified candidate reports from 2024–2025 placement cycles (Naukri, LinkedIn, LeetCode India community) and 2026 projections. Treat ranges as estimates, not guarantees.

Company Tier	Role	CTC (LPA)	In-Hand / Month (est.)	Variable
Tier-1 Product (Atlassian, Razorpay, Groww)	SDE-1	₹18–28 LPA	₹1.1–1.6 L	10–15% of CTC
Tier-2 Product (Freshworks, Chargebee, Zoho)	Junior SDE	₹8–14 LPA	₹55k–85k	5–10%
Large IT Services (TCS, Infosys, Wipro)	Systems Engineer	₹3.5–6.5 LPA	₹22k–38k	0–8%
Mid-size Services (Mphasis, Hexaware, LTIMindtree)	Java Developer	₹5–9 LPA	₹32k–55k	5–8%
BFSI Tech (HDFC Tech, Paytm, PhonePe)	Backend Trainee	₹7–12 LPA	₹45k–72k	5–12%

Estimated range based on verified candidate reports, 2024–2025. 2026 figures project ~8–12% YoY growth at Tier-2 and above.

For services companies, Spring Boot proficiency alone won't move your band, communication and DSA still gate the initial offer. At product companies, Spring Boot depth directly correlates with the L1/L2 offer range.

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Core Spring Boot Concepts Every Fresher Must Know

Auto-Configuration

Spring Boot's @SpringBootApplication annotation triggers auto-configuration by scanning the classpath and applying sensible defaults. If spring-boot-starter-data-jpa is on the classpath and a DataSource bean is absent, Spring Boot creates one from application.properties. Interviewers test whether you understand that auto-configuration is conditional, it backs off when you provide your own bean.

Starters

Starters are curated dependency bundles. spring-boot-starter-web pulls in Spring MVC, Jackson, and Tomcat. spring-boot-starter-test pulls in JUnit 5, Mockito, and AssertJ. You do not declare individual library versions, the parent POM manages them. This is a frequent MCQ trap: "Which starter provides Tomcat?", answer is spring-boot-starter-web, not spring-boot-starter-tomcat (though both exist).

Embedded Server

Spring Boot applications are self-contained. The JAR includes Tomcat (default), Jetty, or Undertow. Deployment is java -jar app.jar, no WAR, no external server required for dev/test. For traditional servers, you can extend SpringBootServletInitializer and package as WAR, interviewers at service companies ask this.

application.properties vs application.yml

Both configure the same properties. YAML supports nesting and multi-document files with --- separators. Properties files are simpler but verbose for hierarchical config. In 2026 interviews, expect at least one question on profile-specific config: application-dev.properties activated via spring.profiles.active=dev.

Spring Boot Actuator

Actuator exposes production-ready endpoints: /actuator/health, /actuator/metrics, /actuator/info. Freshers are rarely asked to implement custom health checks, but knowing the default endpoints and how to secure them via management.endpoints.web.exposure.include is enough.

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Topic Frequency Analysis, Spring Boot in Fresher Drives (2023–2025)

Based on reported questions from 200+ placement drives (campus + off-campus) logged in Indian engineering forums between 2023 and 2025:

Topic	Appeared in (% of drives)	Typical Format
@SpringBootApplication internals	78%	MCQ / short explain
REST controller annotations	72%	MCQ / code snippet
application.properties config	65%	Fill-in / MCQ
Spring Data JPA + repositories	60%	Code writing
Actuator endpoints	48%	MCQ
Profiles & environment config	44%	Short answer
Exception handling (@ControllerAdvice)	41%	Code writing
Spring Security basics	35%	Concept
Bean lifecycle / scopes	33%	MCQ
Embedded server configuration	28%	MCQ

Based on aggregated self-reported question data; treat as directional, not exact.

This tells you where to spend your limited prep time: REST annotations and auto-configuration together cover 70%+ of MCQ rounds.

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Preparation Strategy for Spring Boot Interview Rounds

Week 1, Concepts Cover @RestController, @RequestMapping, @GetMapping/@PostMapping, @PathVariable, @RequestBody, and @RequestParam. Build one CRUD API with H2 in-memory DB. Do not skip the HTTP status code layer, interviewers ask when to return 201 Created vs 200 OK.

Week 2, Spring Data JPA Understand JpaRepository vs CrudRepository vs PagingAndSortingRepository. Practice derived query methods (findByEmailAndStatus). Know what @Entity, @Table, @Id, @GeneratedValue do. One common MCQ: what is the default GenerationType strategy?

Week 3, Config, Profiles, and Testing Read @Value vs @ConfigurationProperties. Write one @SpringBootTest integration test and one @WebMvcTest slice test. Know the difference, @WebMvcTest does not load the full context, making it faster for controller-only tests.

Week 4, Mock Interviews Practice verbal explanations of auto-configuration, bean scopes (singleton vs prototype), and exception handling with @ControllerAdvice. For off-campus drives at product companies, also review system design interview questions 2026, Spring Boot questions often bridge into design discussions at the L1 stage.

Service company drives (TCS, Wipro) pair Java rounds with SQL, cross-train on SQL interview questions for freshers 2026 in parallel.

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Practice MCQs, Spring Boot Freshers 2026

Common Mistakes Freshers Make in Spring Boot Rounds

1. Confusing @Component, @Service, @Repository, and @Controller All four are specializations of @Component and trigger bean registration. The distinction is semantic, @Repository additionally translates persistence exceptions. Interviewers catch freshers who say "only @Component creates beans."

2. Not knowing the difference between @PathVariable and @RequestParam @PathVariable extracts from the URI path (/users/{id}). @RequestParam extracts from the query string (/users?id=5). Getting these mixed up in a code-writing round is an immediate red flag.

3. Claiming auto-configuration "always runs" Auto-configuration is conditional. @ConditionalOnMissingBean, @ConditionalOnClass, and related annotations control when a configuration fires. Freshers who memorize "Spring Boot auto-configures everything" fail follow-up questions.

4. Ignoring application.properties structure questions Hierarchy, profile-specific files, and the @ConfigurationProperties vs @Value trade-off come up more than freshers expect, especially at companies using multi-environment deployments. Review TypeScript interview questions 2026 for a comparable pattern in the JS ecosystem if you're also targeting full-stack roles.

5. Skipping the embedded server question "How do you deploy a Spring Boot app without Tomcat?" or "How do you switch to Jetty?", exclude spring-boot-starter-tomcat and include spring-boot-starter-jetty. This comes up in 1 in 4 Tier-2 product interviews.

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Related Resources

If you're preparing for a full-stack backend interview loop, these articles pair directly with Spring Boot prep:

• SQL Interview Questions for Freshers 2026, JPA hides SQL but interviewers still ask raw queries at service companies.
• System Design Interview Questions 2026, Spring Boot context bridges into design at L1 product rounds.
• Redis Interview Questions, caching with spring-boot-starter-data-redis is a common follow-up topic.
• ServiceNow Interview Questions 2026, BFSI and enterprise shops test Spring + ServiceNow integration.
• Wipro Interview Questions 2026, Wipro's Java rounds include Spring Boot MCQs in the written test.
• TCS Interview Questions 2026, TCS Digital and Prime streams explicitly test Spring Boot in TR rounds.
• Tech Mahindra Interview Questions 2026, Java backend role shortlists consistently include Spring Boot written rounds.
• Stack and Queue Interview Questions 2026, DSA rounds run back-to-back with technical rounds; prep both together.

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FAQs

Q: Do all IT companies test Spring Boot for freshers?

Most Java-stack companies do, TCS Digital, Wipro Turbo, Infosys SP, and virtually all product startups. General IT trainee roles (TCS Ninja, Infosys Systems Engineer) may not require Spring Boot for the initial offer but test it in the training assessment before project allocation. If your JD mentions Java, assume Spring Boot will come up.

Q: Is Spring Boot the same as Spring Framework?

No. Spring Framework is the broader ecosystem (Core, MVC, AOP, Security, Data). Spring Boot is an opinionated layer on top that provides auto-configuration, embedded servers, and production-ready features. You can use Spring Framework without Spring Boot; the reverse is not meaningful since Spring Boot depends on Spring Framework modules.

Q: What version of Spring Boot should I study for 2026 interviews?

Spring Boot 3.x (3.2/3.3) is the current target. It requires Java 17+ and uses Jakarta EE 9 namespaces (jakarta.* instead of javax.*). If a company JD says "Spring Boot experience preferred," prepare for 3.x. Older codebases may still use 2.7.x, the core concepts are identical, but be aware of the namespace change if asked.

Q: How do I practice Spring Boot without a full dev environment?

Spring Initializr (start.spring.io) generates a project in 30 seconds. Use the H2 in-memory database starter, no external DB setup needed. Build a five-endpoint CRUD API for any domain (books, tasks, students). That alone covers 70% of fresher-level interview scenarios.

Q: Is Hibernate knowledge required for Spring Boot JPA questions?

Interviewers at service companies rarely go deep into Hibernate internals. Know what @Entity, @OneToMany, @ManyToOne, @JoinColumn, and FetchType.LAZY vs EAGER mean. Product company L1 rounds may ask about N+1 query problems, understand why FetchType.EAGER on collections causes them and how @EntityGraph or JPQL joins solve it.

Q: What is the difference between @SpringBootTest and @WebMvcTest?

@SpringBootTest loads the full application context, all beans, datasource, security config, everything. It is used for integration tests. @WebMvcTest loads only the web layer (controllers, filters, @ControllerAdvice) and auto-configures MockMvc. It is faster and appropriate for controller-level unit tests. Service beans must be @MockBean-ed in @WebMvcTest tests.

Q: Can I use Spring Boot with databases other than MySQL/PostgreSQL?

Yes. Spring Boot has starters for MongoDB (spring-boot-starter-data-mongodb), Redis (spring-boot-starter-data-redis), Cassandra, Elasticsearch, and more. For NoSQL databases, MongoRepository mirrors JpaRepository patterns. Freshers are rarely tested on these in 2026, but mentioning awareness of the starter ecosystem in an interview signals breadth.