What are the advantages and disadvantages of using Spring Boot in Java application development?

Spring Boot is a framework for simplifying the development of Java applications, which has a number of advantages and disadvantages.

Advantages:

• Automatic configuration — reduces the amount of manual setup.
• Built-in application server (e.g., Tomcat), which simplifies deployment.
• Wide ecosystem and support — many ready-to-use starters for integration with databases, security, web services.
• Accelerates development — less boilerplate code.
• Supports microservice architecture.

Disadvantages:

• Hidden magic — automatic configuration can make it difficult to understand the internal workings.
• Large size of the final application due to inclusion of many dependencies.
• Potentially slower startup time compared to lightweight solutions.

Example of a simple REST controller in Spring Boot:

@RestController
public class HelloController {
    @GetMapping("/hello")
    public String hello() {
        return "Hello, Spring Boot!";
    }
}