Demonstrate how to pass parameters to Spring Boot Application via Servlet Context Parameters

DemoApplication.java

package com.example;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.context.web.SpringBootServletInitializer;

@SpringBootApplication
public class DemoApplication extends SpringBootServletInitializer {

	private ServletContext servletContext;

	@Override
	protected SpringApplicationBuilder configure(
	        SpringApplicationBuilder builder) {
		String activeProfiles =
		        servletContext.getInitParameter("spring.profiles.active");
		if (activeProfiles != null) {
			builder.profiles(activeProfiles.split(","));
		}
		return builder.sources(DemoApplication.class);
	}

	@Override
	public void onStartup(ServletContext servletContext)
	        throws ServletException {
		this.servletContext = servletContext;
		super.onStartup(servletContext);
	}

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

}