spring-boot-console-sample

Example of a simple console Java app built with Spring Boot.

Build Instructions:

Perform a Maven installation.
From STS or similar, select "Run As..." -> "Maven install".
The .jar archive will be installed in the target directory of the project.

How to run:

Navigate to the location of the directory a run the following command:

java -jar spring-boot-console-sample-0.0.1-SNAPSHOT.jar

You should see the following output:

Hello Spring Boot from console!

How it works:

First define your pom.xml with only the right parent and the bare minimum dependencies:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.6.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

and

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter</artifactId>
</dependency>

Then have your Spring Boot Application class implement the CommandLineRunner interface, overriding its run() method:

@SpringBootApplication
public class SpringBootConsoleApplication implements CommandLineRunner {
  
    public static void main(String[] args) {
    	SpringApplication.run(SpringBootConsoleApplication.class, args);
    }
	
    @Override
    public void run(String... args) throws Exception {

    	// Add your application logic here
        System.out.println("Hello Spring Boot from console!");

        System.exit(0);
    }
}

Finally, to ensure it behaves and looks exactly like a typical command line application, we disable the splash screen, the startup logs, and set a logging level of at most WARN in our Spring application.yml file.
This will ensure a completely silent application startup.

spring.main:
    web-application-type: none
    banner-mode: 'off'
    log-startup-info: false
logging.level.root: WARN