testing a single module using jmeter
I am working on a project (web) which is having 32 modules but I need to test (load) only one module. The module starting class is a servlet which takes one xml file as input. I want to check this web application using jmeter. But I am not getting any idea how to proceed as all the links coming in google are describing how to test the entire application but not a particular module. Can any one guide me in this regard.