We're currently evaluating different Java reporting engines, and having a web-based ad-hoc report designer is a requirement.
We don't need anything too fancy, but we need users to be able to define a report with columns X, grouped by Y, sorted by Z, etc...
We've found that many of the open source tools do have graphical report designers, but the designers are typically not web based. (For example, iReport from JasperReports seems to be an application, not a web tool)
Can anyone recommend a reporting tool which meets this web-based requirement?