There has been a pretty serious bug in the community edition of JasperAnalysis apparently since the 5.6 release (a little over a month ago). The bug is described here: http://community.jaspersoft.com/jasperreports-server/issues/3694
It would seem that in order to debug this problem the jasperjpivot source is needed. According to the JasperReports-Server-CP-Source-Build-Guide.pdf, the jasperjpivot source can be obtained from the technical support website. Unfortunately a login is needed for this site which presumably is only available to those with support contracts.
Is the jasperjpivot source available from somewhere else?
Have you checked JasperReports Server source code at sourceforge?
JPivot is another open source project. Jaspersoft is using jar from several other open source projects. You'll need to get sources for these projects from respective project pages.
I agree JPivot is a different project but it seems that Jaspersoft is using a modified version. The jar file is ji-jpivot-5.1.0 and the build guide states: JasperJPivot is adapted from the JPivot open source project. I would be happy to use the standard jpivot but I have been unable to get it to work so far.
I did. It seems that the 'src' file there doesn't have source for jpivot. It looks like it only has ji-jpivot-5.1.0.jar. The build guide I referred to also indicates that the jpivot source needs to come from somewhere else (see Appendix A.1 in the build guide).