Hi, i have define a custom query executer with own query language for my iReport Designer. it works very fine. now i have install the Eclipse-plugin from the jaspersoft Studio and can't see any possibilty to define (deploy) my old executer. How to do this? In the preferences i add net.sf.jasperreports.query.executer.factory.XXXX for my query language but i can't see it in the dropdwonlist and i can't tell which Fields Provider Class is needed like in Designer. Where to find this in Jasperstudio Thanks for Help