83. Batch Applications

This section answers questions that arise from using Spring Batch with Spring Boot.

	Note
	By default, batch applications require a `DataSource` to store job details. If you want to deviate from that, you need to implement `BatchConfigurer`. See The Javadoc of `@EnableBatchProcessing` for more details.

For more about Spring Batch, see the Spring Batch project page.

83.1 Execute Spring Batch Jobs on Startup

Spring Batch auto-configuration is enabled by adding @EnableBatchProcessing (from Spring Batch) somewhere in your context.

By default, it executes all Jobs in the application context on startup (see JobLauncherCommandLineRunner for details). You can narrow down to a specific job or jobs by specifying spring.batch.job.names (which takes a comma-separated list of job name patterns).

If the application context includes a JobRegistry, the jobs in spring.batch.job.names are looked up in the registry instead of being autowired from the context. This is a common pattern with more complex systems, where multiple jobs are defined in child contexts and registered centrally.

See BatchAutoConfiguration and @EnableBatchProcessing for more details.