An inspection of "Format Cells" option would show two semicolons ";;" which means "do not show". A click on the cell was revealing the values though.
In this case I solved the issue setting the pattern attribute of the textField node like below. Note that the code generates an auto-increment number BTW:
<textField pattern="###0;-###0" isBlankWhenNull="false"> <reportElement mode="Transparent" x="0" y="0" width="34" height="13" forecolor="#000000" backcolor="#FFFFFF"/> <textElement textAlignment="Left" verticalAlignment="Top" rotation="None" markup="none"> <font fontName="DejaVu Sans" isBold="false" isItalic="false" isUnderline="false" isStrikeThrough="false" pdfEncoding="Cp1252" isPdfEmbedded="false"/> <paragraph lineSpacing="Single"/> </textElement> <textFieldExpression><![CDATA[$V{REPORT_COUNT}]]></textFieldExpression> </textField>
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