200+ Spring Boot Interview Questions and Answers

Last time I created an article about Top 4 Java Spring Framework Tutorial for Beginners and today we will move on the next step on being a master of Spring Framework. Below is a complete course that will serve as your ultimate guide on your Spring Boot Interview.

Spring Framework Interview Guide - 200+ Questions & Answers

Spring interview can be bloody, so make sure that you are well prepared on each questions. Be ready to answers questions about Spring, Spring Boot, Spring MVC, Spring JDBC, JPA, AOP, RESTful Services and SOAP Web Services. To get you started, here’s a list of questions to keep in mind.

Spring Interview Questions

  1. What is Loose Coupling? [view answer]
  2. What is a Dependency? [view answer]
  3. What is IOC (Inversion of Control)? [view answer]
  4. What is Dependency Injection? [view answer]
  5. Can you give few examples of Dependency Injection? [view answer]
  6. What is Auto Wiring? [view answer]
  7. What are the important roles of an IOC Container? [view answer]
  8. What are Bean Factory and Application Context? [view answer]
  9. Can you compare Bean Factory with Application Context? [view answer]
  10. How do you create an application context with Spring? [view answer]
  11. How does Spring know where to search for Components or Beans? [view answer]
  12. What is a Component Scan? [view answer]
  13. How do you define a component scan in XML and Java Configurations? [view answer]
  14. How is it done with Spring Boot? [view answer]
  15. What does @Component signify? [view answer]
  16. What does @Autowired signify? [view answer]
  17. What’s the difference Between @Controller, @Component, @Repository, and @Service Annotations in Spring? [view answer]
  18. What is the default scope of a bean? [view answer]
  19. Are Spring beans thread safe? [view answer]
  20. What are the other scopes available? [view answer]
  21. How is Spring’s singleton bean different from Gang of Four Singleton Pattern? [view answer]
  22. What are the different types of dependency injections? [view answer]
  23. What is setter injection? [view answer]
  24. What is constructor injection? [view answer]
  25. How do you choose between setter and constructor injections? [view answer]
  26. What are the different options available to create Application Contexts for Spring? [view answer]
  27. What is the difference between XML and Java Configurations for Spring? [view answer]
  28. How do you choose between XML and Java Configurations for Spring? [view answer]
  29. How does Spring do Autowiring? [view answer]
  30. What are the different kinds of matching used by Spring for Autowiring? [view answer]
  31. How do you debug problems with Spring Framework? [view answer]
  32. How do you solve NoUniqueBeanDefinitionException? [view answer]
  33. How do you solve NoSuchBeanDefinitionException? [view answer]
  34. What is @Primary? [view answer]
  35. What is @Qualifier? [view answer]
  36. What is CDI (Contexts and Dependency Injection)? [view answer]
  37. Does Spring Support CDI? [view answer]
  38. Would you recommed to use CDI or Spring Annotations? [view answer]
  39. What are the major features in different versions of Spring? [view answer]
  40. What are new features in Spring Framework 4.0? [view answer]
  41. What are new features in Spring Framework 5.0? [view answer]
  42. What are important Spring Modules? [view answer]
  43. What are important Spring Projects? [view answer]
  44. What is the simplest way of ensuring that we are using single version of all Spring related dependencies? [view answer]
  45. Name some of the design patterns used in Spring Framework? [view answer]
  46. What do you think about Spring Framework? [view answer]
  47. Why is Spring Popular? [view answer]
  48. Can you give a big picture of the Spring Framework? [view answer]

Spring MVC  Interview Questions

  1. What is Model 1 architecture? [view answer]
  2. What is Model 2 architecture? [view answer]
  3. What is Model 2 Front Controller architecture? [view answer]
  4. Can you show an example controller method in Spring MVC? [view answer]
  5. Can you explain a simple flow in Spring MVC? [view answer]
  6. What is a ViewResolver? [view answer]
  7. What is Model? [view answer]
  8. What is ModelAndView? [view answer]
  9. What is a RequestMapping? [view answer]
  10. What is Dispatcher Servlet? [view answer]
  11. How do you set up Dispatcher Servlet? [view answer]
  12. What is a form backing object? [view answer]
  13. How is validation done using Spring MVC? [view answer]
  14. What is BindingResult? [view answer]
  15. How do you map validation results to your view? [view answer]
  16. What are Spring Form Tags? [view answer]
  17. What is a Path Variable? [view answer]
  18. What is a Model Attribute? [view answer]
  19. What is a Session Attribute? [view answer]
  20. What is a init binder? [view answer]
  21. How do you set default date format with Spring? [view answer]
  22. Why is Spring MVC so popular? [view answer]

Spring Boot Interview Questions

  1. What is Spring Boot? [view answer]
  2. What are the important Goals of Spring Boot? [view answer]
  3. What are the important Features of Spring Boot? [view answer]
  4. Compare Spring Boot vs Spring? [view answer]
  5. Compare Spring Boot vs Spring MVC? [view answer]
  6. What is the importance of @SpringBootApplication? [view answer]
  7. What is Auto Configuration? [view answer]
  8. How can we find more information about Auto Configuration? [view answer]
  9. What is an embedded server? Why is it important? [view answer]
  10. What is the default embedded server with Spring Boot? [view answer]
  11. What are the other embedded servers supported by Spring Boot? [view answer]
  12. What are Starter Projects? [view answer]
  13. Can you give examples of important starter projects? [view answer]
  14. What is Starter Parent? [view answer]
  15. What are the different things that are defined in Starter Parent? [view answer]
  16. How does Spring Boot enforce common dependency management for all its Starter projects? [view answer]
  17. What is Spring Initializr? [view answer]
  18. What is application.properties? [view answer]
  19. What are some of the important things that can customized in application.properties? [view answer]
  20. How do you externalize configuration using Spring Boot? [view answer]
  21. How can you add custom application properties using Spring Boot? [view answer]
  22. What is @ConfigurationProperties? [view answer]
  23. What is a profile? [view answer]
  24. How do you define beans for a specific profile? [view answer]
  25. How do you create application configuration for a specific profile? [view answer]
  26. How do you have different configuration for different environments? [view answer]
  27. What is Spring Boot Actuator? [view answer]
  28. How do you monitor web services using Spring Boot Actuator? [view answer]
  29. How do you find more information about your application envrionment using Spring Boot? [view answer]
  30. What is a CommandLineRunner? [view answer]

Database Connectivity – JDBC, Spring JDBC & JPA  Interview Questions

  1. What is Spring JDBC? How is different from JDBC? [view answer]
  2. What is a JdbcTemplate? [view answer]
  3. What is a RowMapper? [view answer]
  4. What is JPA? [view answer]
  5. What is Hibernate? [view answer]
  6. How do you define an entity in JPA? [view answer]
  7. What is an Entity Manager? [view answer]
  8. What is a Persistence Context? [view answer]
  9. How do you map relationships in JPA? [view answer]
  10. What are the different types of relationships in JPA? [view answer]
  11. How do you define One to One Mapping in JPA? [view answer]
  12. How do you define One to Many Mapping in JPA? [view answer]
  13. How do you define Many to Many Mapping in JPA? [view answer]
  14. How do you define a datasource in a Spring Context? [view answer]
  15. What is the use of persistence.xml [view answer]
  16. How do you configure Entity Manager Factory and Transaction Manager? [view answer]
  17. How do you define transaction management for Spring – Hibernate integration? [view answer]

Spring Data Interview Questions

  1. What is Spring Data? [view answer]
  2. What is the need for Spring Data? [view answer]
  3. What is Spring Data JPA? [view answer]
  4. What is a CrudRepository? [view answer]
  5. What is a PagingAndSortingRepository? [view answer]

Unit Testing Interview Questions

  1. How does Spring Framework Make Unit Testing Easy? [view answer]
  2. What is Mockito? [view answer]
  3. What is your favorite mocking framework? [view answer]
  4. How do you do mock data with Mockito? [view answer]
  5. What are the different mocking annotations that you worked with? [view answer]
  6. What is MockMvc? [view answer]
  7. What is @WebMvcTest? [view answer]
  8. What is @MockBean? [view answer]
  9. How do you write a unit test with MockMVC? [view answer]
  10. What is JSONAssert? [view answer]
  11. How do you write an integration test with Spring Boot? [view answer]
  12. What is @SpringBootTest? [view answer]
  13. What is @LocalServerPort? [view answer]
  14. What is TestRestTemplate? [view answer]

AOP Interview Questions

  1. What are cross cutting concerns? [view answer]
  2. How do you implement cross cutting concerns in a web application? [view answer]
  3. If you would want to log every request to a web application, what are the options you can think of? [view answer]
  4. If you would want to track performance of every request, what options can you think of? [view answer]
  5. What is an Aspect and Pointcut in AOP? [view answer]
  6. What are the different types of AOP advices? [view answer]
  7. What is weaving? [view answer]
  8. Compare Spring AOP vs AspectJ? [view answer]

SOAP Web Services Interview Questions

  1. What is a Web Service? [view answer]
  2. What is SOAP Web Service? [view answer]
  3. What is SOAP? [view answer]
  4. Waht is a SOAP Envelope? [view answer]
  5. What is SOAP Header and SOAP Body? [view answer]
  6. Can you give an example of SOAP Request and SOAP Response? [view answer]
  7. What is a SOAP Header? What kind of information is sent in a SOAP Header? [view answer]
  8. Can you give an example of a SOAP Header with Authentication information? [view answer]
  9. What is WSDL (Web Service Definition Language)? [view answer]
  10. What are the different parts of a WSDL? [view answer]
  11. What is Contract First Approach? [view answer]
  12. What is an XSD? [view answer]
  13. Can you give an example of an XSD? [view answer]
  14. What is JAXB? [view answer]
  15. How do you configure a JAXB Plugin? [view answer]
  16. What is an Endpoint? [view answer]
  17. Can you show an example endpoint written with Spring Web Services? [view answer]
  18. What is a MessageDispatcherServlet? [view answer]
  19. How do you configure a MessageDispatcherServlet? [view answer]
  20. How do you generate a WSDL using Spring Web Services? [view answer]
  21. How do you implement error handling for SOAP Web Services? [view answer]
  22. What is a SOAP Fault? [view answer]

RESTful Web Services Interview Questions

  1. What is REST? [view answer]
  2. What are the key concepts in designing RESTful API? [view answer]
  3. What are the Best Practices of RESTful Services? [view answer]
  4. Can you show the code for an example Get Resource method with Spring REST? [view answer]
  5. What happens when we return a bean from a Request Mapping Method? [view answer]
  6. What is GetMapping and what are the related methods available in Spring MVC? [view answer]
  7. Can you show the code for an example Post Resource method with Spring REST? [view answer]
  8. What is the appropriate HTTP Response Status for successful execution of a Resource Creation? [view answer]
  9. Why do we use ResponseEntity in a RESTful Service? [view answer]
  10. What is HATEOAS? [view answer]
  11. Can you give an Example Response for HATEOAS? [view answer]
  12. How do we implement it using Spring? [view answer]
  13. How do you document RESTful web services? [view answer]
  14. Can you give a brief idea about Swagger Documentation? [view answer]
  15. How do you automate generation of Swagger Documentation from RESTful Web Services? [view answer]
  16. How do you add custom information to Swagger Documentation generated from RESTful Web Services? [view answer]
  17. What is Swagger-UI? [view answer]
  18. What is “Representation” of a Resource? [view answer]
  19. What is Content Negotiation? [view answer]
  20. Which HTTP Header is used for Content Negotiation? [view answer]
  21. How do we implement it using Spring Boot? [view answer]
  22. How do you add XML support to your RESTful Services built with Spring Boot? [view answer]
  23. How do you implement Exception Handling for RESTFul Web Services? [view answer]
  24. What are the best practices related to Exception Handling with respect to RESTful Web Services? [view answer]
  25. What are the different error status that you would return in RESTful Web Services? [view answer]
  26. How would you implement them using Spring Boot? [view answer]
  27. What HTTP Response Status do you return for validation errors? [view answer]
  28. How do you handle Validation Errors with RESTful Web Services? [view answer]
  29. Why do we need Versioning for RESTful Web Services? [view answer]
  30. What are the versioning options that are available? [view answer]
  31. How do you implement Versioning for RESTful Web Services? [view answer]

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