SpringBoot application without a rest controller

Question

i´m new to spring and i´m currently working on a spring application to migrate data between 2 databases.

My question is, how is it going to run?? I mean, using spring, how to let spring knows where the migration process will start?

For example, assuming that i have 3 tables (Customer, Product and Invoices).

I´ll work on the classes to migrate first all data from customer, then product and finally invoices.

I´m confused on how spring will manage this when it starts.

Tks in advance.

Answer 1

As @Marged suggested, A CommandLineRunner application would just achieve what you're looking for:

@SpringBootApplication
public class YourMigrationApplication implements CommandLineRunner {
 
    public static void main(String[] args) {
        // Application starts
        SpringApplication.run(SpringBootConsoleApplication.class, args);
        // Migration finished
    }
 
    @Override
    public void run(String... args) {
        // Migrate Customer data
        // Migrate Product data
        // Migrate Invoice data
    }
}

When the migrate invoice data step completes, your application will exit since there's nothing left to run. (And you don't have any controllers etc. to continue listen to).