I used JasperReports a long time ago... It is very nice to see people using it in a Scout application.
Side note:
Be aware that the community license is "GNU Library or Lesser General Public License version 3.0 (LGPLv3)". I am not so sure how this integrate in a commercial application (a lawyer could tell, and there is a commercial version of JasperReport to embed it in a closed source product).