title: Data source parameters in main report evaluated twice
body: <p>I have a main report with 2 sub reports in it.I have two data sources( as json restful service).
  Now I made two parameters in main report which hold the above data sources.
  I passed one each parameter to each of the two sub reports.
  But the problem is - when I deploy and run the report in jasper server - the two parameters are evaluated twice each. Means my json restful services are called four times (two for each parameter). </p>
  
  <p>I have some filters also attached to all the services which are configured as input controls - these have some default values and are part of my restful service data source URL...BUT when I change any filter - the services run exacatly once for each.</p>
  
  <p>Thus in nut shell - first run of report evaluates the parameters twice but after first run if i just change filters it runs one time for each service.</p>
  
  <p>can someone please throw some light on it - I want that each data source param should be evaluated just once - as it takes time for my service to return data.</p>