JSON Datasource - input value is alway null

[mboyle]

Why is the input value always null? If we manually insert a value (say, 'mike') we get data. Otherwise, empty.

<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports"               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"               xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd"              name="tempjson"               pageWidth="842" pageHeight="595" orientation="Landscape"               whenNoDataType="AllSectionsNoDetail"               columnWidth="802"               leftMargin="20" rightMargin ="20"               topMargin ="20" bottomMargin="20"               uuid="1e755737-89be-4155-ac0f-622514dc7ccc">    <property name="com.jaspersoft.studio.data.defaultdataadapter" value="Sample DB"/>    <property name="ireport.jasperserver.url" value="http://localhost:8081/jasperserver-pro/"/>    <property name="ireport.jasperserver.user" value="jasperadmin|Reports"/>    <property name="ireport.jasperserver.reportUnit" value="/public/Blank_mainjr.meb"/>    <parameter name="term" class="java.lang.String"/>    <parameter name="net.sf.jasperreports.json.source" class="java.lang.String">        <defaultValueExpression>            <![CDATA["https://itunes.apple.com/search?term=" + $P{term}]]>        </defaultValueExpression>    </parameter>    <queryString language="json"><![CDATA[results]]></queryString>[/code]

 

[narcism]

What is "input value"? How do you run your report?

[mboyle]

We are using the JasperReportServer (6.3) and JasperStudio (6.4). Inside of our jasperReport (jrxml) we have defined a parameter ('term'):

<parameter name="term" class="java.lang.String"/>

<parameter name="net.sf.jasperreports.json.source" class="java.lang.String">

<defaultValueExpression><![CDATA["https://itunes.apple.com/search?term=" + $P{term}]]></defaultValueExpression>

 

In the Preview pane, we get a prompt for the 'term' that we want to use in our search. But the value we enter

into the UI is not available when the defaultValueExpression is evaluated. We have no idea why or how to work

around this.

 

Thanks.

[narcism]

Try setting evaluationTime to 'Early' and isForPrompting to 'false' for the json source parameter. Your JRXML should look like so:

<parameter name="net.sf.jasperreports.json.source" class="java.lang.String" isForPrompting="false" evaluationTime="Early">

<defaultValueExpression><![CDATA["https://itunes.apple.com/search?term=" + $P{term}]]></defaultValueExpression>

</parameter>

[mboyle]

Thanks for the ideas. Alas, they did not work for either the Community Edition nor the official Jaspersoft version. We did learn that modifying the jrxml file outside  of the studio, we were able to modify the file in such a way that we could successfully run using this line.

<parameter name="net.sf.jasperreports.json.source" class="json">

 

Again - thank you for the suggestion. I hope this 'trick' works going forward.