Please move this to JasperReports Server bug tracker. Resolution below.
Any report with a stored procedure throws error since upgrading from 4.2.1 to 4.5.0. The UI says "An error has occurred. Please contact your system administrator. (6632)"
Stored procedures are valid and arguably more secure however they do not match ^\s*((?i)select)\s+[^;]+$
Users need to be able to disable or edit such security measures. Apologize if this is already possible but I haven't found it documented.