Why Spring Boot over plain Spring in Spring Boot - Challenge Your Understanding

Challenge - 5 Problems

🧠 Conceptual

intermediate

Why does Spring Boot simplify application setup compared to plain Spring?

Which of the following best explains why Spring Boot is preferred over plain Spring for starting new projects?

A Spring Boot removes support for dependency injection to simplify code.

B Spring Boot requires writing more XML configuration files than plain Spring.

C Spring Boot provides auto-configuration and starter dependencies that reduce manual setup.

D Spring Boot only works with web applications, unlike plain Spring.

💡 Hint

Think about how much manual setup you need to do in plain Spring.

Spring Boot offers auto-configuration and starter dependencies that automatically set up common features. This reduces the need for manual XML or Java configuration, making it faster and easier to start projects compared to plain Spring.

❓ component_behavior

intermediate

What happens when you run a Spring Boot application with @SpringBootApplication?

What is the main effect of the @SpringBootApplication annotation in a Spring Boot app?

A It only marks the class as a REST controller without other effects.

B It enables component scanning, auto-configuration, and configuration properties support.

C It disables component scanning and requires manual bean registration.

D It forces the application to run without an embedded server.

💡 Hint

Consider what annotations @SpringBootApplication combines.

@SpringBootApplication is a convenience annotation that combines @Configuration, @EnableAutoConfiguration, and @ComponentScan. This means it enables auto-configuration and scans for components automatically.

📝 Syntax

advanced

Identify the correct way to add a starter dependency in Spring Boot's build file

Which of the following Gradle dependency declarations correctly adds the Spring Boot starter for web applications?

A implementation 'org.springframework.boot:spring-boot-starter-web'

B compile 'org.springframework.boot:spring-boot-starter-web'

C implementation 'spring-boot-web-starter'

D dependency 'org.springframework.boot:spring-boot-web'

💡 Hint

Look for the correct group and artifact ID format for Spring Boot starters.

The correct Gradle dependency for Spring Boot web starter is implementation 'org.springframework.boot:spring-boot-starter-web'. The 'compile' configuration is deprecated, and the artifact ID must be exact.

❓ lifecycle

advanced

How does Spring Boot manage application lifecycle differently than plain Spring?

Which statement best describes Spring Boot's approach to application lifecycle management compared to plain Spring?

A Spring Boot provides an embedded server and manages startup/shutdown automatically.

B Spring Boot requires manual server setup and lifecycle management.

C Spring Boot disables lifecycle callbacks to speed up startup.

D Spring Boot only supports lifecycle management for batch jobs.

💡 Hint

Think about how Spring Boot runs web applications out of the box.

Spring Boot includes an embedded server (like Tomcat) and manages the application lifecycle automatically, including startup and graceful shutdown, which plain Spring requires manual setup for.

🔧 Debug

expert

Why does this Spring Boot app fail to start with a missing dependency?

Given this Spring Boot application fails to start with a ClassNotFoundException for a web controller, what is the most likely cause?

Spring Boot

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

A The application.properties file is empty.

B The @SpringBootApplication annotation is missing on DemoApplication class.

C The main method is not declared static.

D The spring-boot-starter-web dependency is missing from the build file.

💡 Hint

ClassNotFoundException usually means a required library is not on the classpath.

If the web controller class is missing at runtime, it usually means the web starter dependency is not included, so Spring Boot cannot find the required classes to start the web server.