how to pass jasper file path to subreport of subreport

Question

I am using iReport tool in conjunction with JasperReports 1.3.4.

I have a master report, which contain two subreports. One of these subreports has an embedded subreport. All of the .jasper files reside in the same directory.

iReport generated the parameter called SUBREPORT_DIR. The subreportExpression expresses the subreport filename as ![CDATA[$P{SUBREPORT_DIR} + "subreport.jasper"].

Everything works great when the report is generated from within iReport. But, I have a small Java web appplication that I am trying to use to generate reports. I pass a "SUBREPORT_DIR" parameter to JasperFillManager.fillReport(String sourceFileName, Map parameters, JRBeanCollectionDatasource). This SUBREPORT_DIR is set to the directory in which the master report is located.

fillReport throws an exception:

 net.sf.jasperreports.engine.JRException: Could not load object from location :
    .sub-subreport.jasper.

It appears that the first subreport is trying to process its subreport(embedded subreport), but the SUBREPORT_DIR is not being resolved, or used properly to generate the name of the sub-subreport.

Is there something I'm missing? How should this scenario be handled?

Answer 1

What is the value of SUBREPORT_DIR? My guess:

$P{SUBREPORT_DIR} = '.'

Rather, change the value of SUBREPORT_DIR to ./ to find the subreport.

Consider adding a parameter ROOT_DIR to the report. Set its value to the fully qualified directory path where the main report resides. Update the subreport's expression to:

$P{ROOT_DIR} + $P{SUBREPORT_DIR} + "subreport.jasper"

For images and styles:

$P{ROOT_DIR} + $P{IMAGES_DIR} + "filename.png"
$P{ROOT_DIR} + $P{STYLES_DIR} + "style.jrtx"

Be sure to use forward slashes (/) at the end of both ROOT_DIR and the other directory paths.