What Should Replace the Deprecated SpringBootServletInitializer in Spring Boot?

What is the recommended alternative to SpringBootServletInitializer in Spring Boot after its deprecation?

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.0.RELEASE</version>
</parent>

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
// import org.springframework.boot.web.servlet.support.SpringBootServletInitializer; // Use below import instead
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer; // Updated Import

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

As of Spring Boot version 1.4.0.RELEASE, the SpringBootServletInitializer class has been deprecated and should no longer be used. Developers need to transition to using the newer SpringBootServletInitializer class, which resides in the 'org.springframework.boot.web.servlet.support' package. This change is part of an ongoing effort to streamline and improve Spring Boot’s API as well as its overall framework.

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer; // Updated Import

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

Causes

• SpringBootServletInitializer is deprecated due to API simplifications within the Spring Boot framework.
• The deprecation is meant to provide a clearer architectural approach and encourage best practices in servlet initialization.

Solutions

• Replace the existing import statement with the updated class from the appropriate package: import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
• Ensure that you follow the correct usage patterns for servlet initialization within your application, as specified in newer Spring Boot documentation.

Mistake: Continuing to use the deprecated SpringBootServletInitializer without realizing it's no longer supported.

Solution: Check your imports and update to the newer SpringBootServletInitializer from 'org.springframework.boot.web.servlet.support'.

Mistake: Not updating the dependencies when using an outdated version of Spring Boot.

Solution: Ensure your Maven POM file references the latest stable release of Spring Boot.