How can I access JasperReports's variables in Java code?

Question

I want to access a VARIABLE from a JasperReports in my Java code. More specifically, I need to know the REPORT_COUNT and the SUBREPORT_COUNT in my Java code after filling the report. I've tried setting it as a property, but that doesn't work.

The report is scheduled, and I do not want to send the email if there is no data. I've tried setting the "When No Data" to "print 0 pages," and then checking the page count in the java code. This doesn't work if there is data in just the main or the just the subreport. I want it to print 0 pages if either the main or the subreports have no data.

I'm sure this has been asked, but I can't find exactly what I need. If someone could point me in the right direction, it would be appreciated.

brunobastosg · Accepted Answer · 2016-01-04 18:46:44Z

2

Try the following:

JasperReport jasperReport = (JasperReport) JRLoader.loadObject("path/to/your.jasper");

// prior to version 4.6.0, you should use JRFiller.createFiller(jasperReport)
JRFiller.createFiller(DefaultJasperReportsContext.getInstance(), jasperReport);

JasperPrint print = filler.fill(yourParameterMap, yourDatasource);

Object value = filler.getVariableValue(variableName); // here's what you need

Be advised that you won't be able to use JasperFillManager.fillReport anymore.

edited Jan 4, 2016 at 18:46

answered Mar 11, 2015 at 12:07

brunobastosg

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2 Comments

BiancaMeier Over a year ago

Thank you so much! That is exactly what I needed. I didn't know about the JRFiller.

Petter Friberg Over a year ago

The JRFiller.createFiller(jasperReport) is deprecated consider modifying your answer JRFiller.createFiller(DefaultJasperReportsContext.getInstance(),jasperReport);, cheers.

SHK · Accepted Answer · 2018-10-30 06:07:41Z

0

@brunobastosg This won't work if we have reports that return one row with all null fields and 0 in data_found, in this case, you can't tell if it's really no data or not.

answered Oct 30, 2018 at 6:07

SHK

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