Configure cronExpression from another application.

I am new to spring-batch. I have two applications deployed in my jboss server. one is a web applicaion and another is spring-batch application. Both uses same database. The time on which the batch job has to be triggered, is to be made configurable from the web application, thru UI.

Please help on how to acheive this. I now have cronExpression in property file, thus the time on which the job is triggered is static for a deployment.
Please guide me through this.
Thanks in advance