You can write trivial reports yourself in HTML or plain text, but when they get tricky it will probably pay to go for a solid reporting package. Google about for JasperReports and Eclipse BIRT. You can also call from Java to other commercial packages like Crystal. Let us know if any of those look right for your task.
A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi