Using the command-line runners

With our basic application skeleton ready, let's add some meat to the bones by making our application do something.

Let's start by first creating a class named StartupRunner. This will implement the CommandLineRunner interface, which basically provides just one method: public void run(String... args) --that will get called by Spring Boot only once after the application has started.

How to do it...

1. Create the file named StartupRunner.java under the src/main/java/com/example/bookpub/ directory from the root of our project with the following content:

        package com.example.bookpub; 

        import com.example.bookpub.repository.BookRepository;
        import org.apache.commons.logging.Log; 
        import org.apache.commons.logging.LogFactory; 
        import org.springframework.beans.factory.annotation.Autowired;
        import org.springframework.boot.CommandLineRunner; 
        import org.springframework.scheduling.annotation.Scheduled;

        public class...