Scheduling a job

Some jobs need to be executed regularly-every night, every hour, and so on. Spring makes this easy with the @Scheduled annotation.

Getting ready

We will use the job defined in the Creating a job recipe.

How to do it…

Follow these steps to schedule the job:

1. If it's not done already, add the Spring Batch configuration class to the getServletConfigClasses()method in your class extending AbstractAnnotationConfigDispatcherServletInitializer:

   public class ServletInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
   
   @Override
   protected Class<?>[] getServletConfigClasses() {
       return new Class<?>[]{AppConfig.class, BatchConfig.class};
   }

2. Add the @EnableScheduling annotation to the Spring Batch configuration class:

   @Configuration
   @EnableBatchProcessing
   @EnableScheduling
   public class BatchConfig {
   ...

3. Add an autowired JobLauncher field:

   @Autowired
   JobLauncher jobLauncher;

4. Add a method annotated with @Scheduled with a fixedDelay attribute in ms:

   @Scheduled(fixedDelay...