java - Running a spring batch job multiple times

Question

I have created a spring batch job with spring boot using below tutorial:

https://spring.io/guides/gs/batch-processing/

The job is reading a file and writing to a database as expected.

However, now I have a use case to run this job multiple times.

I have an ArrayList of parameters.

What changes should I do to the job so that I can run the job the number of times the size of my ArrayList ?

Answer 1

You can kickstart your batch job manually like this

@Component
Class Someclass{
  ...............
     @Autowired
     private JobLauncher jobLauncher;
     @Autowired
     private Job job;  

     public void someFunction(){
       jobLauncher.run(job, new JobParameters());  
   }
}

Only thing is you cannot restart a batch job if it is already completed, It throws an error saying the status is COMPLETED. For this to work you have to set allowStartIfComplete property to true. This has to be done in your batch step configuration, something like this

stepBuilderFactory.get("step1")
                .<Person, Person> chunk(10)
                .reader(reader())
                .processor(processor())
                .writer(writer())
                .allowStartIfComplete(true)
                .build();