Spring Boot CommandLineRunner Code Example

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Spring Boot helps you quickly get started with building a Spring-based web app in no time. All you need to do is go to Eclipse IDE, create a new Spring Starter Project and that is it. This is provided you installed Eclipse plugin, Spring Tools (aka Spring IDE and Spring Tool Suite) by going to Help > Eclipse Marketplace… and searching for “spring tools” keyword.

Often, one wants to run a Spring Boot app as a Java application as like a traditional Java program and test different parts of their app.

In this post, you will get a template code for quickly getting started with Command Liner which would help you to execute your Spring boot app as a Java application.

Spring Boot App with CommandLineRunner

I create a spring started a project with the name as recruiterbot. I got the following code:

package com.vitalflux.rbot;

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

@SpringBootApplication
public class RecruiterbotApplication {

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

In order to work with command line, all you need to do is implement an interface CommandLineRunner. The following code represents the same.

@SpringBootApplication
public class RecruiterbotApplication implements CommandLineRunner {

    public static void main(String[] args) {
        SpringApplication app = new SpringApplication(RecruiterbotApplication.class);
        app.run(args);
    }

    @Override
    public void run(String... arg0) throws Exception {
        System.out.println("Hello World");
    }
}

To run the Spring Boot as Java application from within Eclipse, right-click on the program, RecruiterBotApplication and click Run As / Java Application.

References

Summary

In this post, you learned about getting started with Spring Boot app using CommandLineRunner.

Did you find this article useful? Do you have any questions or suggestions about this article in relation to Spring Boot app with CommandLineRunner? Leave a comment and ask your questions and I shall do my best to address your queries.

Ajitesh Kumar

Ajitesh Kumar

Ajitesh has been recently working in the area of AI and machine learning. Currently, his research area includes Safe & Quality AI. In addition, he is also passionate about various different technologies including programming languages such as Java/JEE, Javascript and technologies such as Blockchain, mobile computing, cloud-native technologies, application security, cloud computing platforms, big data etc.

He has also authored the book, Building Web Apps with Spring 5 and Angular.
Ajitesh Kumar

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