[jasperreports-questions] Incompatible java.lang.String value assigned to parameter importDate

[Greg Stephens]

I'm a new user trying to pass a date as a parameter receiving
this Incompatible java.lang.String error from a groovy .gsp page 

Here's the .gsp fragment where importDate is a groovy Date: 

    <g:jasperReport jasper="reportSec3" format="HTML" name="Securities by 
Class"> 
      <input type="hidden" name="importDate" 
value="${holdingImportDateInstance.importDate}"/>
    </g:jasperReport> 

and the jrxml 

<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="Sec3" language="groovy" pageWidth="595" pageHeight="842"
columnWidth="535" leftMargin="20" rightMargin="20" topMargin="20"
bottomMargin="20"> 
        <parameter name="importDate" class="java.util.Date"> 
                <defaultValueExpression><![CDATA[]]></defaultValueExpression> 
        </parameter>
        <queryString> 
                <![CDATA[SELECT 
     holding.`symbol_id` AS holding_symbol_id, 
     holding.`market_value` AS holding_market_value, 
     security.`asset_class` AS security_asset_class, 
     security.`symbol` AS security_symbol, 
     holding_import_date.`import_date` AS holding_import_date_import_date, 
     security.`name` AS security_name, 
     holding.`date_id` AS holding_date_id, 
     holding_import_date.`id` AS holding_import_date_id 
FROM 
     `security` security INNER JOIN `holding` holding ON security.`id` = 
holding.`symbol_id` 
     INNER JOIN `holding_import_date` holding_import_date ON holding.`date_id` 
= holding_import_date.`id` 
WHERE 
     holding_import_date.`import_date` = $P{importDate}


      
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