Generar PDF / A en jasper-report, contiene numerosas dificultades y no es compatible con algunas versiones de jasper-report. Por eso he decidido pasar estoQpregunta-AEn la siguiente respuesta, se indican los pasos y la versión de la biblioteca necesarios para exportar un informe simple con un gráfico a PDF / A

Data de muestra (usersRep.csv)

+----------------+--------+
|      User      |  Rep   |
+----------------+--------+
| Jon Skeet      | 854503 |
| Darin Dimitrov | 652133 |
| BalusC         | 639753 |
| Hans Passant   | 616871 |
| Me             |   5640 |
+----------------+--------+

Jrxml de muestra (reputación.jrxml)

<?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="reputation" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="a88bd694-4f90-41fc-84d0-002b90b2d73e">
    <queryString>
        <![CDATA[]]>
    </queryString>
    <field name="User" class="java.lang.String"/>
    <field name="Rep" class="java.lang.Long"/>
    <columnHeader>
        <band height="20" splitType="Stretch">
            <staticText>
                <reportElement x="0" y="0" width="100" height="20" uuid="9e7b5f50-5795-4c95-a122-f14f2e3f9366"/>
                <box leftPadding="3" bottomPadding="0" rightPadding="3">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.5" lineStyle="Double"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement verticalAlignment="Middle">
                    <font fontName="SansSerif" isBold="true"/>
                </textElement>
                <text><![CDATA[User]]></text>
            </staticText>
            <staticText>
                <reportElement x="100" y="0" width="100" height="20" uuid="4a6f0a2a-d9b5-4e74-a9e8-0f965336f2bf"/>
                <box leftPadding="3" bottomPadding="0" rightPadding="3">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.5" lineStyle="Double"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement textAlignment="Right" verticalAlignment="Middle">
                    <font fontName="SansSerif" isBold="true"/>
                </textElement>
                <text><![CDATA[Reputation]]></text>
            </staticText>
        </band>
    </columnHeader>
    <detail>
        <band height="20" splitType="Stretch">
            <textField>
                <reportElement x="0" y="0" width="100" height="20" uuid="8ff583b9-88dc-4726-85e1-16d79de78095"/>
                <box leftPadding="3" bottomPadding="0" rightPadding="3">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement verticalAlignment="Middle">
                    <font fontName="SansSerif"/>
                </textElement>
                <textFieldExpression><![CDATA[$F{User}]]></textFieldExpression>
            </textField>
            <textField>
                <reportElement x="100" y="0" width="100" height="20" uuid="ebd33b2f-7297-41c2-9dc7-78ff472890c4"/>
                <box leftPadding="3" bottomPadding="0" rightPadding="3">
                    <pen lineWidth="0.25"/>
                    <topPen lineWidth="0.25"/>
                    <leftPen lineWidth="0.25"/>
                    <bottomPen lineWidth="0.25"/>
                    <rightPen lineWidth="0.25"/>
                </box>
                <textElement textAlignment="Right" verticalAlignment="Middle">
                    <font fontName="SansSerif"/>
                </textElement>
                <textFieldExpression><![CDATA[$F{Rep}]]></textFieldExpression>
            </textField>
        </band>
    </detail>
    <pageFooter>
        <band height="140">
            <pieChart>
                <chart isShowLegend="false">
                    <reportElement x="225" y="-670" width="320" height="140" uuid="23bd26a6-04a4-406f-8a1a-5e1b260cb75d"/>
                    <chartTitle/>
                    <chartSubtitle/>
                    <chartLegend/>
                </chart>
                <pieDataset>
                    <keyExpression><![CDATA[$F{User}]]></keyExpression>
                    <valueExpression><![CDATA[$F{Rep}]]></valueExpression>
                </pieDataset>
                <piePlot>
                    <plot/>
                    <itemLabel/>
                </piePlot>
            </pieChart>
        </band>
    </pageFooter>
</jasperReport>

Código Java para exportar a PDF (reputación.pdf)

JasperReport report = JasperCompileManager.compileReport("reputation.jrxml");
JRCsvDataSource datasource = new JRCsvDataSource("usersRep.csv");
datasource.setFieldDelimiter(';');
datasource.setUseFirstRowAsHeader(true);

JasperPrint jasperPrint = JasperFillManager.fillReport(report, new HashMap<String, Object>(),datasource);

JRPdfExporter exporter = new JRPdfExporter();
exporter.setExporterInput(new SimpleExporterInput(jasperPrint));
exporter.setExporterOutput(new SimpleOutputStreamExporterOutput("reputation.pdf"));
SimplePdfExporterConfiguration configuration = new SimplePdfExporterConfiguration();
configuration.setMetadataAuthor("Me and only me");
exporter.setConfiguration(configuration);
exporter.exportReport();

Esto exporta el informe a un pdf, ¿qué debo hacer para generar un PDF / A-1a?