SpringApplication

The SpringApplication class provides a convenient way to bootstrap a Spring application that is started from a main() method. In many situations, you can delegate to the static SpringApplication.run method, as shown in the following example:

Java
Kotlin

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MyApplication {

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

}

import org.springframework.boot.autoconfigure.SpringBootApplication
import org.springframework.boot.runApplication


@SpringBootApplication
class MyApplication

fun main(args: Array<String>) {
	runApplication<MyApplication>(*args)
}

When your application starts, you should see something similar to the following output:

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::       (v3.1.0-SNAPSHOT)

2023-04-27T19:52:10.878Z  INFO 2994 --- [           main] o.s.b.d.f.s.MyApplication                : Starting MyApplication using Java 17.0.6 with PID 2994 (/opt/apps/myapp.jar started by myuser in /opt/apps/)
2023-04-27T19:52:10.892Z  INFO 2994 --- [           main] o.s.b.d.f.s.MyApplication                : No active profile set, falling back to 1 default profile: "default"
2023-04-27T19:52:13.035Z  INFO 2994 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2023-04-27T19:52:13.050Z  INFO 2994 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-04-27T19:52:13.051Z  INFO 2994 --- [           main] o.apache.catalina.core.StandardEngine    : Starting Servlet engine: [Apache Tomcat/10.1.5]
2023-04-27T19:52:13.280Z  INFO 2994 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-04-27T19:52:13.284Z  INFO 2994 --- [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2265 ms
2023-04-27T19:52:14.162Z  INFO 2994 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2023-04-27T19:52:14.192Z  INFO 2994 --- [           main] o.s.b.d.f.s.MyApplication                : Started MyApplication in 4.162 seconds (process running for 4.882)

By default, INFO logging messages are shown, including some relevant startup details, such as the user that launched the application. If you need a log level other than INFO, you can set it, as described in Log Levels. The application version is determined using the implementation version from the main application class’s package. Startup information logging can be turned off by setting spring.main.log-startup-info to false. This will also turn off logging of the application’s active profiles.

To add additional logging during startup, you can override logStartupInfo(boolean) in a subclass of SpringApplication.