Java reports software

I think the best option for you will be use Jasper reports which are opensource and are good for Java applications. Using Jasper reports we can create a large variety of reports. The input for the reports can be a XML or a SQL query.Also the metadata for the reports is stored in a xml and can be configured. The only limitation I think for this is that we cannot create dynamic reports easily. Means if the we requie to design a report first and then things are good. But if you require to create a report with no of columns to be known at runtime then this is not easily done with Jasper reports. But good thing about it is that we can export the report in XLS,CVS,PDF and HTML using Jasper reports.