Question

I have a data source that is composed of object { groupName, rowName, colName, value }. I’m trying to put the fields row,col,val in a crosstab, separated by group [the group has headers]. A collection of the data objects is being stored as the main datasource.

I’m gettting the error when I try to do this:

net.sf.jasperreports.engine.JRRuntimeException: Error incrementing crosstab dataset
    net.sf.jasperreports.engine.fill.JRFillCrosstab$JRFillCrosstabDataset.customIncrement(JRFillCrosstab.java:762)
    net.sf.jasperreports.engine.fill.JRFillElementDataset.increment(JRFillElementDataset.java:193)
    net.sf.jasperreports.engine.fill.JRCalculator.calculateVariables(JRCalculator.java:162)
    net.sf.jasperreports.engine.fill.JRVerticalFiller.fillDetail(JRVerticalFiller.java:747)

Does anyone have suggestions to why this is happening or how to fix it?

Answer 1

I found the following which might help: *

What “Crosstab data has already been
processed” exception means?

This exception is thrown if more data
is added to the crosstab dataset after
the crosstab has already been
rendered.
This usually happens when a
crosstab element is linked to the main
dataset of the report (does not use a
subdataset run) and the resetType
attribute of the crosstab dataset does
not match the place where the crosstab
is rendered.
Crosstabs are special
components that display aggregated
data. And when they are linked to the
main dataset of the report, you simply
cannot put them in the detail section,
because there is no data to aggregate
from a single record.
Such crosstabs
could only reside on a group footer or
on the summary section of the report
and have the appropriate resetType
value, so that their dataset is
initialized each time after they are
rendered.
If you still think you need
to render one crosstab for each detail
in the master document, then almost
certainly this crosstab should be
linked to a subdataset and not to the
main dataset of the report.

You must be trying to put all of the data in the detail section, which wouldn’t allow for the crosstab component to agregate all of your data.

^{* _{jasperforge.org}}