I wonder if the IBM/WebSphere forum is the appropriate venue for a JasperReports issue, especially given the fact that, as you mention, you actually use Tomcat.
In any case, I have used JasperReports myself, and for the occasional problem I would encounter I would use the forums at the JasperReports site. (http://jasperreports.sourceforge.net/). The author (Teodor Danciu) is usually around to give advice. Other people hanging around those forums may be able to provide counsel too.
Hope this helps,
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