Spring boot tricky interview questions [10]

spring boot tricky interview questions: Spring Boot is an open-source Java framework used for building web applications and microservices. It is a part of the Spring Framework and provides a simplified approach to building applications by offering a set of opinionated defaults and auto-configurations.

Table of Contents

Spring boot tricky interview questions: Spring Boot makes it easy to create standalone, production-grade Spring-based applications that you can run. It uses an embedded web server, so you don’t need to deploy your application to a separate web server. You can package your application as a JAR file and run it using the Java command.

Some key features of Spring Boot include:

Auto-configuration: Spring Boot automatically configures the application based on the dependencies you have added to your project.
Embedded web server: Spring Boot provides an embedded web server, so you don’t need to deploy your application to a separate server.
Starter dependencies: Spring Boot provides a set of starter dependencies that you can use to quickly add common features to your application, such as a database, security, or messaging.
Production-ready features: Spring Boot provides features such as health checks, metrics, and monitoring that make it easy to build production-ready applications.

Overall, Spring Boot is a powerful and flexible framework that simplifies the development of Java-based web applications and microservices.

Spring boot tricky interview questions

How does Spring Boot differ from Spring Framework?
What is the use of @SpringBootApplication annotation?
Explain the difference between Spring Boot’s @Component, @Service, and @Repository annotations.
What is Spring Boot Actuator and what are some of its features?
Can you explain the difference between Spring Boot’s @RestController and @Controller annotations?
How does Spring Boot handle configuration properties?
What is the purpose of the application.properties file in Spring Boot?
How can you configure a custom error page in Spring Boot?
What is the use of Spring Boot Starter Parent?
What is Spring Boot Auto-configuration, and how does it work?
Can you explain how Spring Boot supports multiple databases?
What is the role of Spring Boot DevTools?
What is the use of the Spring Boot CLI?
Can you explain how Spring Boot simplifies unit testing?
How can you customize Spring Boot’s default behavior?
Spring boot tricky interview questions

Spring boot tricky interview questions with Answers program Example

Sure, here are some tricky interview questions about Spring Boot along with their answers and example code:

What is the difference between @Component, @Service, @Repository, and @Controller annotations in Spring Boot?

Answer: All of these annotations are used to declare a class as a Spring Bean, but they have different meanings:

@Component: Marks the class as a generic Spring component
@Service: Marks the class as a service layer component
@Repository: Marks the class as a persistence layer component
@Controller: Marks the class as a web layer component (used in MVC applications)

Example code: Spring boot tricky interview questions

@Component
public class MyComponent {
   // ...
}

@Service
public class MyService {
   // ...
}

@Repository
public class MyRepository {
   // ...
}

@Controller
public class MyController {
   // ...
}

How can you enable HTTP compression in Spring Boot?

Answer: To enable HTTP compression in Spring Boot, you can add the following configuration in your application.properties or application.yml file:

server.compression.enabled=true
server.compression.min-response-size=1024

The “min-response-size” property specifies the minimum size (in bytes) of a response that will be compressed.

Example code: Spring boot tricky interview questions

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void configureContentNegotiation(ContentNegotiationConfigurer configurer) {
        configurer
            .favorPathExtension(true)
            .ignoreAcceptHeader(true)
            .defaultContentType(MediaType.APPLICATION_JSON)
            .mediaType("xml", MediaType.APPLICATION_XML)
            .mediaType("json", MediaType.APPLICATION_JSON);
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(new MappingJackson2HttpMessageConverter());
        converters.add(new Jaxb2RootElementHttpMessageConverter());
    }

    @Bean
    public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter() {
        return new MappingJackson2HttpMessageConverter();
    }

    @Bean
    public Jaxb2RootElementHttpMessageConverter jaxb2RootElementHttpMessageConverter() {
        return new Jaxb2RootElementHttpMessageConverter();
    }
}

What is the purpose of the @SpringBootApplication annotation in Spring Boot?

Answer: The @SpringBootApplication annotation is a convenience annotation that combines @Configuration, @EnableAutoConfiguration, and @ComponentScan annotations. It is used to mark the main class of a Spring Boot application.

Example code:

@SpringBootApplication
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

What is Spring Boot Actuator and how do you enable it?

Answer: Spring Boot Actuator is a library that provides additional management endpoints for your Spring Boot application, such as health checks, metrics, and more.

To enable Spring Boot Actuator, you need to add the following dependency to your project:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

You can also customize the endpoints by adding the following configuration in your application.properties or application.yml file:

management.endpoints.web.exposure.include=*

This will expose all endpoints over the HTTP management port.

Example code:

@RestController
public class MyController {
    @GetMapping("/hello")
    public String hello() {
        return "Hello World!";
    }
}

How can you customize the error page in Spring Boot?

Answer: To customize the error page in Spring Boot, you can create a HTML file in

Java Spring boot tough interview questions with Answers

Here are some tough interview questions about Java Spring Boot:

What is the difference between @Autowired and @Inject annotations in Spring Boot?

Answer: Both annotations are used to inject dependencies into a Spring bean, but @Inject is part of the Java Dependency Injection (JSR-330) specification, while @Autowired is a Spring-specific annotation.

One difference between the two is that @Inject supports constructor injection, while @Autowired does not. Additionally, @Inject allows you to use qualifiers to specify which dependency to inject, while @Autowired uses the @Qualifier annotation for the same purpose.

Example code:

// Using @Autowired
@Component
public class MyComponent {
   @Autowired
   private MyService myService;
   // ...
}

// Using @Inject
@Component
public class MyComponent {
   @Inject
   @Qualifier("myService")
   private MyService myService;
   // ...
}

What is the purpose of @Transactional annotation in Spring Boot?

Answer: The @Transactional annotation is used to mark a method or class as transactional, which means that a database transaction will be created and managed by Spring.

When you use this annotation, Spring will automatically manage the transaction, including rollback if an exception is thrown. This can help to ensure data consistency in your application.

Example code:

@Service
public class MyService {
   @Transactional
   public void saveData(MyData data) {
      // ...
   }
   // ...
}

How do you implement pagination in Spring Boot?

Answer: To implement pagination in Spring Boot, you can use the Pageable interface along with Spring Data JPA. This interface allows you to specify the page number, page size, and sorting parameters for your query.

Example code:

@Service
public class MyService {
   @Autowired
   private MyRepository myRepository;

   public Page<MyData> getData(Pageable pageable) {
      return myRepository.findAll(pageable);
   }
   // ...
}

@Repository
public interface MyRepository extends JpaRepository<MyData, Long> {
   // ...
}

What is the purpose of @Conditional annotation in Spring Boot?

Answer: The @Conditional annotation is used to conditionally create a Spring bean based on certain conditions. You can use this annotation to create beans only if certain conditions are met, such as the presence of a certain class or property in the application context.

Example code:

@Configuration
public class MyConfig {
   @Bean
   @Conditional(OnProdEnvironmentCondition.class)
   public MyService myService() {
      return new MyServiceImpl();
   }
   // ...
}

public class OnProdEnvironmentCondition implements Condition {
   @Override
   public boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
      String env = context.getEnvironment().getProperty("environment");
      return "prod".equals(env);
   }
}

How do you implement caching in Spring Boot?

Answer: To implement caching in Spring Boot, you can use the @Cacheable and @CacheEvict annotations. The @Cacheable annotation marks a method as cacheable, while the @CacheEvict annotation marks a method as removing an entry from the cache.

Example code:

@Service
public class MyService {
   @Cacheable("myCache")
   public MyData getData(Long id) {
      // ...
   }

   @CacheEvict("myCache")
   public void clearCache() {
      // ...
   }
   // ...
}

Note that you also need to configure a caching provider, such as Ehcache or Redis, in your application context.

Latest Jobs Placement & Drive Update On Telegram Channel Join

Join Telegram	Click Here
Home Page	Full Stack With Java
PSA New Batch Join	Click Here

Some key features of Spring Boot include: