Recently the On Demand Jaspersoft Server was upgraded to version 6.4.2
After creating a simple query as Data source in Jaspersoft Studio, it always returns a query execution error after clicking on the next button in the New Report Wizard.
It gives this error:
Title : "query execution error"
Description :"the following problem occured: null"
"do you want to proceed anyway ?" YES/NO
After upgrade to Jaspersoft Server 6.4.2, also the Jaspersoft Studio will need to be upgrade to Jaspersoft Studio 6.4.2, as it will need the new jdbc drivers coming with this version to connect to the Jaspersoft 6.4.2 Server.
On Demand users can download the Jaspersoft Studio from here