How to create a column footer for Jasper Report? - jasper-reports

Question

I am creating an Excel using Jasper Report. I want to create a footer at the end of the columns which has a total. Eg:
Col 1 | Col 2
1.0 1.0
2.0 3.0
Total 3.0 4.0
I have in my XML:
...
<variable name="totalCol1" class="java.math.BigDecimal" calculation="Sum">
<variableExpression><![CDATA[$F{col1}]]></variableExpression>
</variable>
<variable name="totalCol2" class="java.math.BigDecimal" calculation="Sum">
<variableExpression><![CDATA[$F{col2}]]></variableExpression>
</variable>
...
<detail>
<band height="83" splitType="Prevent">
<crosstab isRepeatColumnHeaders="false" columnBreakOffset="0" ignoreWidth="true">
....
....
</crosstab>
</band>
</detail>
<columnFooter>
<band height="210" splitType="Prevent">
<textField>
<reportElement x="2210" y="180" width="100" height="30" uuid="d4580669-65c4-46c2-b7ca-9e10624d9651"/>
<textElement textAlignment="Center">
<font isBold="true"/>
</textElement>
<textFieldExpression><![CDATA[$P{lblTotal}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="2310" y="180" width="100" height="30" uuid="1e41e36a-6eca-43d6-8096-edc893686f92"/>
<textElement>
<font isBold="true"/>
</textElement>
<textFieldExpression><![CDATA[$V{totalcol1}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="2410" y="180" width="100" height="30" uuid="ffff6945-f711-44cf-8356-092f3f3da688"/>
<textElement>
<font isBold="true"/>
</textElement>
<textFieldExpression><![CDATA[$V{totalCol2}]]></textFieldExpression>
</textField>
</band>
</columnFooter>
Columns 1 and 2 appears. But neither the label for Total nor the sum appears. Can someone help? If you need more info, please comment. Thanks in advance.