passing a list for macro

I have the following macro code:

<#macro tpl_columnHeader columns>
	<columnHeader>
		<band height="31" isSplitAllowed="true">
			<#assign x = 0>		
			<#list columns as column>			
				<staticText>
					<reportElement mode="Opaque" x="${x}" y="1" width="${column.width}"
height="30" key="staticText-${column_index}" forecolor="#ffffff"
backcolor="#bbbbbb"/>
					<box topBorder="None" topBorderColor="#000000" leftBorder="None"
leftBorderColor="#000000" rightBorder="None" rightBorderColor="#000000"
bottomBorder="None" bottomBorderColor="#000000"/>
					<textElement textAlignment="Center">
						
					</textElement>
					<text><![CDATA[${column.display}]]></text>
				</staticText>
				<#assign x = x + column.width>
			</#list>		
		</band>
	</columnHeader>
</#macro>		

I'm trying to call it using:

<@tpl_columnHeader columns=columList/>

where columnList is a List of Column object but it's not working. The
columnList is passed from my Java class:

params.put("columnList", columnList);

Is that possible to do what I want? What is the correct syntax???

Thanks,

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