OpenReports is an open source web based reporting application that 
provides the ability for users to view dynamically created PDF, HTML 
or XLS reports in a browser. 

OpenReports uses Hibernate, along with a number of other open source 
components such as WebWork2, JasperReports, Velocity, and Quartz.

For more information visit: http://sourceforge.net/projects/oreports 
or http://opensourcesoft.net