we´ve made the transitiion from iReport to Jasper Studio.
The one thing that I can´t seem to find is a way to specify QueryExecutors and my Fields Provider JAR.
Could you tell me how to configure my Jasper Studio so that I can specify Query Executors and include my fields provider JAR ?
Check the following page. It's not a general how to on adding query executers but may give you idea on steps required. Jaspersoft Studio is just Eclipse so the page show the basic Eclipse steps on adding jars.