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Spring Boot provides two interfaces, CommandLineRunner and ApplicationRunner, to run specific pieces of code when an application is fully started. These interfaces get called just before run() once SpringApplication completes.

CommandLineRunner

This interface provides access to application arguments as string array. Let's see the example code for more clarity.

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ApplicationRunner

ApplicationRunner wraps the raw application arguments and exposes the ApplicationArguments interface, which has many convinent methods to get arguments, like getOptionNames() to return all the arguments' names, getOptionValues() to return the agrument value, and raw source arguments with method getSourceArgs(). Let's see an example:

When to Use It

When you want to execute some piece of code exactly before the application startup completes, you can use it then. Audio video photo editing software free download. Records — database and organizer 1 5 3. In one of our projects, we used these to source data from other microservices via service discovery, which was registered in Consul. Impresso pro 1 8 3 – transform photos into paintings.

Ordering

You can register as many application/command line runners as you want. You just need to register them as Beans in the application context. Then, Spring will automatically pick them up. You can order them as well either by extending interface org.springframework.core.Ordered or via the @Order annotation.

This is all about the application/command line runners. You can also see org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner in spring-batch, which implements CommandLineRunner to register and start batch jobs at application startup. I hope you find this informative and helpful. You can grab the full example code on GitHub.

Published at DZone with permission of Gaurav Rai Mazra, DZone MVB. See the original article here.

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