为什么 JasperReports Server 显示空报告？
Why JasperReports Server shows empty report?
我已经在 Jaspersoft Studio 中创建了一个示例报告
并且我创建了服务器连接并将创建的报告发布到它。但是当我打开服务器并检查已发布的相同项目时，它显示空报告。为什么会这样？
连接到 jasper 服务器：
报表设计：
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.3.0.final using JasperReports Library version 6.3.0 -->
<!-- 2016-09-23T17:10:52 -->
<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="myCoffee" pageWidth="595" pageHeight="842" columnWidth="535" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="ced95029-b569-4027-895c-af2843a4e088">
<property name="com.jaspersoft.studio.data.sql.tables" value=""/>
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Sample DB"/>
<property name="ireport.jasperserver.url" value="http://localhost:8080/jasperserver-pro/"/>
<property name="ireport.jasperserver.user" value="jasperadmin"/>
<property name="ireport.jasperserver.reportUnit" value="/public/Samples/newwww_cofeee"/>
<property name="ireport.jasperserver.report.resource" value="/public/Samples/newwww_cofeee_files/main_jrxml"/>
<style name="Title" fontName="Times New Roman" fontSize="50" isBold="true"/>
<style name="SubTitle" forecolor="#736343" fontName="Arial" fontSize="18"/>
<style name="Column header" forecolor="#666666" fontName="Arial" fontSize="12" isBold="true"/>
<style name="Detail" fontName="Arial" fontSize="12"/>
<style name="Row" mode="Transparent">
<conditionalStyle>
<conditionExpression><![CDATA[$V{REPORT_COUNT}%2 == 0]]></conditionExpression>
<style backcolor="#E6DAC3"/>
</conditionalStyle>
</style>
<queryString>
<![CDATA[select * from "ORDERS"]]>
</queryString>
<field name="ORDERID" class="java.lang.Integer"/>
<field name="SHIPNAME" class="java.lang.String"/>
<field name="SHIPADDRESS" class="java.lang.String"/>
<field name="SHIPCITY" class="java.lang.String"/>
<field name="SHIPREGION" class="java.lang.String"/>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="136" splitType="Stretch">
<image>
<reportElement x="0" y="0" width="164" height="126" uuid="ddc15723-2728-421f-b95e-2df9faf64ce1"/>
<imageExpression><![CDATA["coffee.jpg"]]></imageExpression>
</image>
<staticText>
<reportElement style="Title" x="170" y="0" width="263" height="62" uuid="1a652692-054a-40f3-ade5-68d8da36626d"/>
<textElement verticalAlignment="Middle"/>
<text><![CDATA[Coffee Title]]></text>
</staticText>
<staticText>
<reportElement style="SubTitle" x="219" y="62" width="196" height="22" uuid="88d4231e-f014-4b0d-b871-1737ba63a1ae"/>
<textElement>
<font fontName="Times New Roman"/>
</textElement>
<text><![CDATA[Coffee SubTitle]]></text>
</staticText>
<staticText>
<reportElement x="172" y="94" width="383" height="42" uuid="f0bfb1ea-a85a-47cd-a1a4-43f22b45e80f"/>
<textElement textAlignment="Right">
<font size="10"/>
</textElement>
<text><![CDATA[Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce auctor purus gravida arcu aliquam mattis. Donec et nulla libero, ut varius massa. Nulla sed turpis elit. Etiam aliquet mauris a ligula hendrerit in auctor leo lobortis.]]></text>
</staticText>
<image>
<reportElement x="433" y="-115" width="267" height="209" uuid="5d64e5b3-07bb-48ab-89dc-15c0c46bb19a"/>
<imageExpression><![CDATA["coffee_stain.png"]]></imageExpression>
</image>
</band>
</title>
<pageHeader>
<band splitType="Stretch"/>
</pageHeader>
<columnHeader>
<band height="16" splitType="Stretch">
<line>
<reportElement positionType="FixRelativeToBottom" x="0" y="15" width="555" height="1" uuid="1a61a836-d137-48b1-ad67-6ff64600bf93"/>
<graphicElement>
<pen lineWidth="0.5" lineColor="#999999"/>
</graphicElement>
</line>
<staticText>
<reportElement style="Column header" x="0" y="0" width="111" height="15" forecolor="#736343" uuid="0ff41838-59fc-47bd-9b48-1bc622576a80"/>
<text><![CDATA[ORDERID]]></text>
</staticText>
<staticText>
<reportElement style="Column header" x="111" y="0" width="111" height="15" forecolor="#736343" uuid="3c5657fa-038a-4b98-a026-2f6203f5c0be"/>
<text><![CDATA[SHIPNAME]]></text>
</staticText>
<staticText>
<reportElement style="Column header" x="222" y="0" width="111" height="15" forecolor="#736343" uuid="c9f171bf-1fbb-472d-a5ab-d5bd23340350"/>
<text><![CDATA[SHIPADDRESS]]></text>
</staticText>
<staticText>
<reportElement style="Column header" x="333" y="0" width="111" height="15" forecolor="#736343" uuid="0907046f-988c-4903-9f92-fcc927eb8a14"/>
<text><![CDATA[SHIPCITY]]></text>
</staticText>
<staticText>
<reportElement style="Column header" x="444" y="0" width="111" height="15" forecolor="#736343" uuid="d9a1b7ba-d450-4f4c-9956-ba21a8ff4066"/>
<text><![CDATA[SHIPREGION]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="15" splitType="Stretch">
<frame>
<reportElement style="Row" mode="Opaque" x="0" y="0" width="555" height="15" uuid="a98495d8-3c8d-4fa0-81f5-30c3efc2f766"/>
<textField isStretchWithOverflow="true">
<reportElement style="Detail" x="0" y="0" width="111" height="15" uuid="004e4afd-035d-42f8-8d5f-f2f847459fb5"/>
<textFieldExpression><![CDATA[$F{ORDERID}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement style="Detail" x="111" y="0" width="111" height="15" uuid="bf9e44ec-80a7-40fc-afca-60227b369850"/>
<textFieldExpression><![CDATA[$F{SHIPNAME}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement style="Detail" x="222" y="0" width="111" height="15" uuid="60bc8d8f-c31a-491d-acaa-27c2d00a54f9"/>
<textFieldExpression><![CDATA[$F{SHIPADDRESS}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement style="Detail" x="333" y="0" width="111" height="15" uuid="8b37170b-04ae-4269-9e01-d5e70e5c0b08"/>
<textFieldExpression><![CDATA[$F{SHIPCITY}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement style="Detail" x="444" y="0" width="111" height="15" uuid="a0ce4789-f7ab-4eb0-94bf-35152ddbf1b5"/>
<textFieldExpression><![CDATA[$F{SHIPREGION}]]></textFieldExpression>
</textField>
</frame>
</band>
</detail>
<columnFooter>
<band height="45" splitType="Stretch">
<line>
<reportElement positionType="FixRelativeToBottom" x="0" y="3" width="555" height="1" uuid="fa45a887-615a-4d84-a2d7-8a2219671b3c"/>
<graphicElement>
<pen lineWidth="0.5" lineColor="#999999"/>
</graphicElement>
</line>
</band>
</columnFooter>
<pageFooter>
<band height="25" splitType="Stretch">
<frame>
<reportElement mode="Opaque" x="-21" y="1" width="597" height="24" forecolor="#D0B48E" backcolor="#F2EBDF" uuid="183682bc-d976-4756-83e0-6625a3f98ed1"/>
<textField evaluationTime="Report">
<reportElement style="Column header" x="533" y="0" width="40" height="20" forecolor="#736343" uuid="0193f9b3-1559-491a-8580-b6988863b6a1"/>
<textElement verticalAlignment="Middle">
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA[" " + $V{PAGE_NUMBER}]]></textFieldExpression>
</textField>
<textField>
<reportElement style="Column header" x="453" y="0" width="80" height="20" forecolor="#736343" uuid="d00b105e-494b-418b-8ac9-8b1b4824f4f0"/>
<textElement textAlignment="Right" verticalAlignment="Middle">
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA["Page "+$V{PAGE_NUMBER}+" of"]]></textFieldExpression>
</textField>
<textField pattern="EEEEE dd MMMMM yyyy">
<reportElement style="Column header" x="22" y="1" width="197" height="20" forecolor="#736343" uuid="0616f3fe-0354-456f-8911-ec30ec51a5ae"/>
<textElement verticalAlignment="Middle">
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA[new java.util.Date()]]></textFieldExpression>
</textField>
</frame>
</band>
</pageFooter>
<summary>
<band splitType="Stretch"/>
</summary>
JasperReports Server 上的报告是空的，因为很可能您在发布时没有select编辑数据源。
您已经使用 Jaspersoft Studio 附带的示例数据库创建并测试了报告。服务器也必须可以访问相同的数据，或者在这种情况下具有相同结构的相同数据库 table。您在发布报告时指定。
幸运的是，服务器上有一个数据源，其结构与 Studio 中的数据源类似 table。您需要做的是在相同位置和 Report Publishing Wizard 到 select Data Source from Repository 中重新发布报告，然后输入此路径：
/public/Samples/Data_Sources/ExmapleVDS
（打字错误是有意的）或手动 select 通过浏览这些文件夹：
Public > Samples > Data Sources > ExampleVDS
在由输入文本字段旁边的 ... 按钮触发的 Repository Browser 对话框中。
注意：Studio 中的服务器连接是通过 jasperadmin 用户完成的。
我已经在 Jaspersoft Studio 中创建了一个示例报告
并且我创建了服务器连接并将创建的报告发布到它。但是当我打开服务器并检查已发布的相同项目时，它显示空报告。为什么会这样？
连接到 jasper 服务器：
报表设计：
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.3.0.final using JasperReports Library version 6.3.0 -->
<!-- 2016-09-23T17:10:52 -->
<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="myCoffee" pageWidth="595" pageHeight="842" columnWidth="535" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="ced95029-b569-4027-895c-af2843a4e088">
<property name="com.jaspersoft.studio.data.sql.tables" value=""/>
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Sample DB"/>
<property name="ireport.jasperserver.url" value="http://localhost:8080/jasperserver-pro/"/>
<property name="ireport.jasperserver.user" value="jasperadmin"/>
<property name="ireport.jasperserver.reportUnit" value="/public/Samples/newwww_cofeee"/>
<property name="ireport.jasperserver.report.resource" value="/public/Samples/newwww_cofeee_files/main_jrxml"/>
<style name="Title" fontName="Times New Roman" fontSize="50" isBold="true"/>
<style name="SubTitle" forecolor="#736343" fontName="Arial" fontSize="18"/>
<style name="Column header" forecolor="#666666" fontName="Arial" fontSize="12" isBold="true"/>
<style name="Detail" fontName="Arial" fontSize="12"/>
<style name="Row" mode="Transparent">
<conditionalStyle>
<conditionExpression><![CDATA[$V{REPORT_COUNT}%2 == 0]]></conditionExpression>
<style backcolor="#E6DAC3"/>
</conditionalStyle>
</style>
<queryString>
<![CDATA[select * from "ORDERS"]]>
</queryString>
<field name="ORDERID" class="java.lang.Integer"/>
<field name="SHIPNAME" class="java.lang.String"/>
<field name="SHIPADDRESS" class="java.lang.String"/>
<field name="SHIPCITY" class="java.lang.String"/>
<field name="SHIPREGION" class="java.lang.String"/>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="136" splitType="Stretch">
<image>
<reportElement x="0" y="0" width="164" height="126" uuid="ddc15723-2728-421f-b95e-2df9faf64ce1"/>
<imageExpression><![CDATA["coffee.jpg"]]></imageExpression>
</image>
<staticText>
<reportElement style="Title" x="170" y="0" width="263" height="62" uuid="1a652692-054a-40f3-ade5-68d8da36626d"/>
<textElement verticalAlignment="Middle"/>
<text><![CDATA[Coffee Title]]></text>
</staticText>
<staticText>
<reportElement style="SubTitle" x="219" y="62" width="196" height="22" uuid="88d4231e-f014-4b0d-b871-1737ba63a1ae"/>
<textElement>
<font fontName="Times New Roman"/>
</textElement>
<text><![CDATA[Coffee SubTitle]]></text>
</staticText>
<staticText>
<reportElement x="172" y="94" width="383" height="42" uuid="f0bfb1ea-a85a-47cd-a1a4-43f22b45e80f"/>
<textElement textAlignment="Right">
<font size="10"/>
</textElement>
<text><![CDATA[Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce auctor purus gravida arcu aliquam mattis. Donec et nulla libero, ut varius massa. Nulla sed turpis elit. Etiam aliquet mauris a ligula hendrerit in auctor leo lobortis.]]></text>
</staticText>
<image>
<reportElement x="433" y="-115" width="267" height="209" uuid="5d64e5b3-07bb-48ab-89dc-15c0c46bb19a"/>
<imageExpression><![CDATA["coffee_stain.png"]]></imageExpression>
</image>
</band>
</title>
<pageHeader>
<band splitType="Stretch"/>
</pageHeader>
<columnHeader>
<band height="16" splitType="Stretch">
<line>
<reportElement positionType="FixRelativeToBottom" x="0" y="15" width="555" height="1" uuid="1a61a836-d137-48b1-ad67-6ff64600bf93"/>
<graphicElement>
<pen lineWidth="0.5" lineColor="#999999"/>
</graphicElement>
</line>
<staticText>
<reportElement style="Column header" x="0" y="0" width="111" height="15" forecolor="#736343" uuid="0ff41838-59fc-47bd-9b48-1bc622576a80"/>
<text><![CDATA[ORDERID]]></text>
</staticText>
<staticText>
<reportElement style="Column header" x="111" y="0" width="111" height="15" forecolor="#736343" uuid="3c5657fa-038a-4b98-a026-2f6203f5c0be"/>
<text><![CDATA[SHIPNAME]]></text>
</staticText>
<staticText>
<reportElement style="Column header" x="222" y="0" width="111" height="15" forecolor="#736343" uuid="c9f171bf-1fbb-472d-a5ab-d5bd23340350"/>
<text><![CDATA[SHIPADDRESS]]></text>
</staticText>
<staticText>
<reportElement style="Column header" x="333" y="0" width="111" height="15" forecolor="#736343" uuid="0907046f-988c-4903-9f92-fcc927eb8a14"/>
<text><![CDATA[SHIPCITY]]></text>
</staticText>
<staticText>
<reportElement style="Column header" x="444" y="0" width="111" height="15" forecolor="#736343" uuid="d9a1b7ba-d450-4f4c-9956-ba21a8ff4066"/>
<text><![CDATA[SHIPREGION]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="15" splitType="Stretch">
<frame>
<reportElement style="Row" mode="Opaque" x="0" y="0" width="555" height="15" uuid="a98495d8-3c8d-4fa0-81f5-30c3efc2f766"/>
<textField isStretchWithOverflow="true">
<reportElement style="Detail" x="0" y="0" width="111" height="15" uuid="004e4afd-035d-42f8-8d5f-f2f847459fb5"/>
<textFieldExpression><![CDATA[$F{ORDERID}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement style="Detail" x="111" y="0" width="111" height="15" uuid="bf9e44ec-80a7-40fc-afca-60227b369850"/>
<textFieldExpression><![CDATA[$F{SHIPNAME}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement style="Detail" x="222" y="0" width="111" height="15" uuid="60bc8d8f-c31a-491d-acaa-27c2d00a54f9"/>
<textFieldExpression><![CDATA[$F{SHIPADDRESS}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement style="Detail" x="333" y="0" width="111" height="15" uuid="8b37170b-04ae-4269-9e01-d5e70e5c0b08"/>
<textFieldExpression><![CDATA[$F{SHIPCITY}]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true">
<reportElement style="Detail" x="444" y="0" width="111" height="15" uuid="a0ce4789-f7ab-4eb0-94bf-35152ddbf1b5"/>
<textFieldExpression><![CDATA[$F{SHIPREGION}]]></textFieldExpression>
</textField>
</frame>
</band>
</detail>
<columnFooter>
<band height="45" splitType="Stretch">
<line>
<reportElement positionType="FixRelativeToBottom" x="0" y="3" width="555" height="1" uuid="fa45a887-615a-4d84-a2d7-8a2219671b3c"/>
<graphicElement>
<pen lineWidth="0.5" lineColor="#999999"/>
</graphicElement>
</line>
</band>
</columnFooter>
<pageFooter>
<band height="25" splitType="Stretch">
<frame>
<reportElement mode="Opaque" x="-21" y="1" width="597" height="24" forecolor="#D0B48E" backcolor="#F2EBDF" uuid="183682bc-d976-4756-83e0-6625a3f98ed1"/>
<textField evaluationTime="Report">
<reportElement style="Column header" x="533" y="0" width="40" height="20" forecolor="#736343" uuid="0193f9b3-1559-491a-8580-b6988863b6a1"/>
<textElement verticalAlignment="Middle">
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA[" " + $V{PAGE_NUMBER}]]></textFieldExpression>
</textField>
<textField>
<reportElement style="Column header" x="453" y="0" width="80" height="20" forecolor="#736343" uuid="d00b105e-494b-418b-8ac9-8b1b4824f4f0"/>
<textElement textAlignment="Right" verticalAlignment="Middle">
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA["Page "+$V{PAGE_NUMBER}+" of"]]></textFieldExpression>
</textField>
<textField pattern="EEEEE dd MMMMM yyyy">
<reportElement style="Column header" x="22" y="1" width="197" height="20" forecolor="#736343" uuid="0616f3fe-0354-456f-8911-ec30ec51a5ae"/>
<textElement verticalAlignment="Middle">
<font size="10" isBold="false"/>
</textElement>
<textFieldExpression><![CDATA[new java.util.Date()]]></textFieldExpression>
</textField>
</frame>
</band>
</pageFooter>
<summary>
<band splitType="Stretch"/>
</summary>
JasperReports Server 上的报告是空的，因为很可能您在发布时没有select编辑数据源。
您已经使用 Jaspersoft Studio 附带的示例数据库创建并测试了报告。服务器也必须可以访问相同的数据，或者在这种情况下具有相同结构的相同数据库 table。您在发布报告时指定。
幸运的是，服务器上有一个数据源，其结构与 Studio 中的数据源类似 table。您需要做的是在相同位置和 Report Publishing Wizard 到 select Data Source from Repository 中重新发布报告，然后输入此路径：
/public/Samples/Data_Sources/ExmapleVDS
（打字错误是有意的）或手动 select 通过浏览这些文件夹：
Public > Samples > Data Sources > ExampleVDS
在由输入文本字段旁边的 ... 按钮触发的 Repository Browser 对话框中。
注意：Studio 中的服务器连接是通过 jasperadmin 用户完成的。