Java modules communication

I have one module written on Java - web service module which accepts request process it(some business rules here), saves(modify or delete) values in db (using Hibernate) and then send status response). Is it reasonable to refactor that module so at the end there will be 2 modules - 1 is web service module and 2 - processing module where business rules applied and db processes made? and if yes then what is the good practices for information exchange between modules ? Спасибо!