Velocity use in plugin input parameters template

I am trying to dynamically populate a list of custom fields into my plugin input page. I have the following code fragment

            <select name="customFields">
#set ($customFields = $customFieldManager.getCustomFieldObjects())
               <option>$customFields.size()</option>
#foreach($customField in $customFields)
                <option>$customField.getFieldName() - $customField.getCustomFieldType().getName()</option>
#end
            </select>

The result is a single option with the number 0 - indicating that the customFields list is empty. Why?

Duh — I am working in a temporary test environment and I have no custom fields.

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