Call oracle report webservice in java web application

I have a webservice that supplies rdf reports using Oracle Reports and i would like to display these reports via a Java Web App that will call them". Does anyone have an answer on how they accomplish this? My user selects their report from a .jsp and then they fill out a beginning and ending date fields. These dates are passed over to rdf Reports and then the report is displayed in a browser as pdf. what i want is how to call the oracle report webservice in my java web application. If anyone has a clue on how to do this or a link to someplace that shows how this is done or atleast refere some good books. please reply to this post. Thanks