What is the best report tool to be used on JBoss?

I need to provide some pdf files, generating them dynamically. I am using iText but it is very low level.

I have tried the Seam PDF tags, but they are too buggy for the header / footer sections.

XSL-FO does not run on JBoss, because of class loader issues.

Can I use BIRT or JasperReport? What is the best ? I do not want to spend some days trying, then to discover that something does not work.

Thank you,

Paolo