Batch processing and multiple deploys issue

Hi all,

I am developing application which contains some batch processing. My implementation is so far very simple, easily customized batch sample payroll. It works, but I have problem with multiple deploys.
After few deploys on same context RuntimeException occurs that my @Named bean for itemReader was not found.
When I change context to something else it works again, but I do not really understand, why it is not working on same context.

Also it is possible to delete all jobs from JobRepository ? And where is the database placed?

Thanks for help :)