[FIXED] How to execute a Spring Batch job from a Spring Boot app

Issue

I have two spring apps. First one is a Spring Boot (app A) and the other is a standalone Spring Batch (app B) app.

Usually, I am using a script to execute the Spring Batch (app B) jar and in the main method, I will write the jobs that I want to run.

 ApplicationContext context = SpringApplication.run(RacerBatchApp.class, args);
    JobLauncher jobLauncher = (JobLauncher) context.getBean("jobLauncher");
    try {
        jobLauncher.run((Job) context.getBean("JOB NAME -> XXX"), new JobParametersBuilder().addLong("job.key", System.currentTimeMillis()).toJobParameters());
    } catch (BeansException | JobExecutionAlreadyRunningException | JobRestartException | JobInstanceAlreadyCompleteException | JobParametersInvalidException e) {
        e.printStackTrace();
    }

I have a new requirement to launch a specific job in app B via app A. Basically app A Spring Boot will execute the standalone app B jar and job name XXX (hope I am clear)

Also, I don’t want to add Spring Batch dependence to the Spring Boot app.

How can I do that?

Thank you

Solution

You can pass the job name as an argument to appA, and use it in the main method to get the job by name from the application context:

java -jar appA.jar job.name=myJob

Then in the main method:

String jobName = ..; // get job.name from application arguments;
Job job = context.getBean(jobName, Job.class);
// run the job
...

That said, I would make appB a Boot Batch app and just run:

java -jar appB.jar --spring.batch.job.names=myJob

Answered By - Mahmoud Ben Hassine
Answer Checked By - Katrina (JavaFixing Volunteer)