Spring batch - How to run multiple jobs in parallel - spring-batch

Question

I have multiple scheduled jobs in BatchScheduler which runs at a particular time. Simple inbuilt JobLauncher which is sync. in nature is used initially.
Now, I want to run the jobs in parallel so that no job can wait for other to finish.
I have tried with the #Async annotation on my different jobs but it did not worked.
I have also tried creating different JobLauncher object for each and every job but it also did not worked.
Then, I tried with setting the jobLauncher.setTaskExecutor(new SimpleAsyncTaskExecutor()).
But it did not worked.
I have also tried #Bean
public JobLauncher jobLauncher() {
final SimpleJobLauncher jobLauncher = new SimpleJobLauncher();
jobLauncher.setJobRepository(jobRepository);
final SimpleAsyncTaskExecutor simpleAsyncTaskExecutor = new SimpleAsyncTaskExecutor();
jobLauncher.setTaskExecutor(simpleAsyncTaskExecutor);
return jobLauncher;
}
I have tried all the combinations given in different stackoverflow answers but it did not worked.
#Bean
public JobLauncher jobLauncher() {
final SimpleJobLauncher jobLauncher = new SimpleJobLauncher();
jobLauncher.setJobRepository(jobRepository);
final SimpleAsyncTaskExecutor simpleAsyncTaskExecutor = new SimpleAsyncTaskExecutor();
jobLauncher.setTaskExecutor(simpleAsyncTaskExecutor);
return jobLauncher;
}
Actual:
But it also did not worked.
As when I am checking the starttime for the batch jobs in batch tables. The job are starting when 1 job is finished.
Expected:
Jobs should run in parallel.

Answer 1

this configuration works for me:
import org.springframework.batch.core.configuration.annotation.DefaultBatchConfigurer;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.batch.core.launch.support.SimpleJobLauncher;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
#Configuration
public class TaskExecutorBatchConfigurer extends DefaultBatchConfigurer {
#Bean
public ThreadPoolTaskScheduler batchTaskScheduler() {
ThreadPoolTaskScheduler threadPoolTaskScheduler = new ThreadPoolTaskScheduler();
threadPoolTaskScheduler.setPoolSize(10);
threadPoolTaskScheduler.afterPropertiesSet();
return threadPoolTaskScheduler;
}
#Override
protected JobLauncher createJobLauncher() throws Exception {
SimpleJobLauncher jobLauncher = new SimpleJobLauncher();
jobLauncher.setJobRepository(super.getJobRepository());
jobLauncher.setTaskExecutor(batchTaskScheduler());
jobLauncher.afterPropertiesSet();
return jobLauncher;
}
}