jasper subreport blank new page - jasper-reports

Question

I made a jasper file and it shows a new page, there will be a blank page, please tell me how to fix it.
I use iReport-5.6.0 to modify it.
Main (part of the sub report)
<band height="109" splitType="Immediate">
<subreport>
<reportElement style="style_detail" positionType="Float" x="0" y="31" width="445" height="23" uuid="8d1ddd6f-a366-4634-bc00-eea444fa9920"/>
<subreportParameter name="ENDTEXT1">
<subreportParameterExpression><![CDATA[$P{ENDTEXT1}]]></subreportParameterExpression>
</subreportParameter>
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.data.JRBeanCollectionDataSource($F{letterTransList4})]]></dataSourceExpression>
<subreportExpression><![CDATA[$P{SUBREPORT_DIR} + "subreport1.jasper"]]></subreportExpression>
</subreport>
</band>
Sub Report
<?xml version="1.0" encoding="UTF-8"?>
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="correspondenceReportPOABG_subreport1" pageWidth="444" pageHeight="802" whenNoDataType="AllSectionsNoDetail" columnWidth="444" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" uuid="7e2bd990-3814-4075-a5f2-e4d4a29b5bad">
<property name="ireport.zoom" value="1.5"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<property name="net.sf.jasperreports.export.docx.flexible.row.height" value="true"/>
<style name="style_header" hAlign="Left" vAlign="Top" fontName="" fontSize="15"/>
<style name="style_detail" hAlign="Left" vAlign="Top" fontName="" fontSize="14" isBold="false" isItalic="false" isUnderline="false" isStrikeThrough="false">
<paragraph lineSpacing="Single"/>
</style>
<parameter name="ENDTEXT1" class="java.lang.String"/>
<field name="detail" class="java.lang.String"/>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="1" splitType="Stretch"/>
</title>
<pageHeader>
<band splitType="Stretch"/>
</pageHeader>
<columnHeader>
<band splitType="Stretch"/>
</columnHeader>
<detail>
<band height="21" splitType="Immediate">
<textField isStretchWithOverflow="true">
<reportElement style="style_detail" positionType="Float" x="0" y="0" width="444" height="21" uuid="186ec40e-42e2-488a-a21c-a5bba58c0e90"/>
<textElement markup="none">
<paragraph lineSpacing="Single"/>
</textElement>
<textFieldExpression><![CDATA[$F{detail}]]></textFieldExpression>
</textField>
</band>
</detail>
<columnFooter>
<band splitType="Stretch"/>
</columnFooter>
<pageFooter>
<band splitType="Immediate"/>
</pageFooter>
<summary>
<band splitType="Stretch"/>
</summary>
</jasperReport>
I made a jasper file and it shows a new page, there will be a blank page, please tell me how to fix it.
I want no blank pages. How should I set it up?
I use iReport-5.6.0 to modify it.

Answer 1

The page format on your subreport is currently set to pageHeight="802" which equals one full A4 page and that's why it's using a full page in your main report.
I'd recommend adjusting the page format of the subreport to match the allocated space in the main report.