上周我一直在努力解决这个问题，但我无法解决。在带有浏览器的 Tomcat 上使用 Mapfish Print 3 我正在尝试打印在 Jaspersoft Studio 中生成的 .jrxml 模板。模板的数据源是一个 .json，包含表格。
当我从 jaspersoft studio 打印 pdf 时，一切正常，但是当我从 Mapfish 打印它时，我的表的字段没有被填充，所以我有正确的表列名称，并且下面只有一行填充了“null”。
Tomcat 日志抛出此错误：
gradle: 09:34:01.835 [PrintJobManager-3] WARN o.m.p.o.AbstractJasperReportOutputFormat - The field letter in prova_json.jrxml is not available in at least one of the rows in the datasource. This may not be an error.
gradle: 09:34:01.835 [PrintJobManager-3] WARN o.m.p.o.AbstractJasperReportOutputFormat - The field number in prova_json.jrxml is not available in at least one of the rows in the datasource. This may not be an error.
我查看了模板数据适配器、.yaml 和 .json 配置，但一无所获。我对此很陌生，我可能会忘记一些基本的东西。
如果有人可以提供帮助，我会非常高兴。
非常感谢
这是我的 .yaml：
templates:
A4 portrait: !template
reportTemplate: prova_json.jrxml
attributes:
title: !string
default: "Mytable"
processors:
- !reportBuilder
directory: '.'
这是我的 .json：
{
"layout": "A4 portrait",
"outputFormat": "pdf",
"attributes": {},
"example":[
{"letter":"A", "number":"1"},
{"letter":"B", "number":"2"},
{"letter":"C", "number":"3"}
]
}
这是我的 .jrxml：
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.6.0.final using JasperReports Library version 6.6.0 -->
<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="prova_json" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="443dccec-8ac9-486f-b9e2-bf8809609b24">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="requestData"/>
<parameter name="title" class="java.lang.String"/>
<queryString language="json">
<![CDATA[example]]>
</queryString>
<field name="letter" class="java.lang.String">
<property name="net.sf.jasperreports.json.field.expression" value="letter"/>
<fieldDescription><![CDATA[letter]]></fieldDescription>
</field>
<field name="number" class="java.lang.Integer">
<property name="net.sf.jasperreports.json.field.expression" value="number"/>
<fieldDescription><![CDATA[number]]></fieldDescription>
</field>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="50" splitType="Stretch">
<textField>
<reportElement x="230" y="20" width="100" height="30" uuid="e15aa58f-c3f8-415c-b783-9d99cd9fd936"/>
<box>
<topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<textFieldExpression><![CDATA[$P{title}]]></textFieldExpression>
</textField>
</band>
</title>
<pageHeader>
<band height="35" splitType="Stretch"/>
</pageHeader>
<columnHeader>
<band height="30" splitType="Stretch">
<staticText>
<reportElement x="100" y="0" width="180" height="30" uuid="710e904e-be4b-4827-bed5-cba2caa930af">
<property name="com.jaspersoft.studio.spreadsheet.connectionID" value="fca73b4c-ec21-4d8e-8103-e847788aa7d0"/>
</reportElement>
<box>
<topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[letter]]></text>
</staticText>
<staticText>
<reportElement x="280" y="0" width="175" height="30" uuid="2434f475-1bf1-428b-9eda-428133d8f1e3">
<property name="com.jaspersoft.studio.spreadsheet.connectionID" value="70d93515-4ef5-4746-acac-b96c8b4f43c9"/>
</reportElement>
<box>
<topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[number]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="30" splitType="Stretch">
<textField>
<reportElement x="100" y="0" width="180" height="30" uuid="bf808ed8-1e3e-4d6f-9e62-03c2491b89cd">
<property name="com.jaspersoft.studio.spreadsheet.connectionID" value="fca73b4c-ec21-4d8e-8103-e847788aa7d0"/>
</reportElement>
<box>
<topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<textFieldExpression><![CDATA[$F{letter}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="280" y="0" width="175" height="30" uuid="e53139cc-0aee-4f5a-8b45-55123ae024fd">
<property name="com.jaspersoft.studio.spreadsheet.connectionID" value="70d93515-4ef5-4746-acac-b96c8b4f43c9"/>
</reportElement>
<box>
<topPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<leftPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<bottomPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
<rightPen lineWidth="1.0" lineStyle="Solid" lineColor="#000000"/>
</box>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<textFieldExpression><![CDATA[$F{number}]]></textFieldExpression>
</textField>
</band>
</detail>
<columnFooter>
<band height="45" splitType="Stretch"/>
</columnFooter>
<pageFooter>
<band height="54" splitType="Stretch"/>
</pageFooter>
<summary>
<band height="42" splitType="Stretch"/>
</summary>
</jasperReport>