Adding a subreport Using an XML Datasource : subreport xml fields are displaying NULL in parent Report

[mannaii.amira]

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I'm new to iReport (I'm using the 5.1.0 version ). I'm trying to add a subreport to an existing parent report but when i preview it displays Null in the subreport fields. Here's my Datasource Expression : ((net.sf.jasperreports.engine.data.JRXmlDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("//idProjet") Here's the parent report XML: name="SUBREPORT_DIR" class="java.lang.String" isForPrompting="false"> "C:\Users\Amira\" language="xPath"> /projetData/projet name="nomProjet" class="java.lang.String"> nomProjet splitType="Stretch"/> height="79" splitType="Stretch"/> height="35" splitType="Stretch"/> splitType="Stretch"/> height="338" splitType="Stretch"> uuid="91594abb-0277-4441-b9dc-f6cd39cec90b" x="0" y="0" width="555" height="338"/> ((net.sf.jasperreports.engine.data.JRXmlDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("//idProjet") $P{SUBREPORT_DIR} + "report1_subreport1.jasper" height="45" splitType="Stretch"/> height="54" splitType="Stretch"/> height="42" splitType="Stretch"/>[/code]   Here's the subreport XML: language="xPath"> /projetData/projet name="idProjet" class="java.lang.String"> idProjet name="nomProjet" class="java.lang.String"> nomProjet splitType="Stretch"/> height="61" splitType="Stretch"> uuid="5e05731c-782d-4bd8-8832-dbd5811bf78d" x="143" y="41" width="100" height="20"/> idProjet height="87" splitType="Stretch"> uuid="099b70b0-6f52-4a95-843c-636c3645a319" x="143" y="0" width="84" height="18"/> $F{idProjet} [/code]

 

[Thomas Zimmer]

with ...$P{REPORT_DATA_SOURCE}... you are using the main report´s datasource an pass it to the subreport.

so it has to be sth. like:

new net.sf.jasperreports.engine.data.JRXmlDataSource(new File("C:\mycoolxmlsubreportdata")).subDataSource("//idProjet")

or

new net.sf.jasperreports.engine.data.JRXmlDataSource(new File("C:\mycoolxmlsubreportdata"), "//idProjet")

use on of the follwowing constructors to create a new datasource (on a separate XML-File) on-the-fly for your subreport:

JRXmlDataSource(java.io.File file)

JRXmlDataSource(java.io.File file, boolean isNamespaceAware)

JRXmlDataSource(java.io.File file, java.lang.String selectExpression)

JRXmlDataSource(java.io.File file, java.lang.String selectExpression, boolean isNamespaceAware)

or look here:

http://jasperreports.sourceforge.net/api/net/sf/jasperreports/engine/data/JRXmlDataSource.html

Cheers, Thomas

http://www.thomaszimmer.net