Jasper reports 当任何列标题单元格中的TextField内容增长超过页面高度时，为什么表会引发异常？

当表格单元格（文本字段）的内容较大时，Jasperreports Studio在预览期间引发运行时错误。这里重要的一点是，文本字段需要将其Stretch With Overflow属性设置为True

以下是引发的异常：

net.sf.jasperreports.engine.JRException: net.sf.jasperreports.engine.JRRuntimeException: Infinite loop creating new page due to column header overflow.
at com.jaspersoft.studio.editor.preview.view.control.ReportController.fillReport(ReportController.java:536)
at com.jaspersoft.studio.editor.preview.view.control.ReportController.access$17(ReportController.java:511)
at com.jaspersoft.studio.editor.preview.view.control.ReportController$1.run(ReportController.java:429)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)
Caused by: net.sf.jasperreports.engine.JRRuntimeException: Infinite loop creating new page due to column header overflow.
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillColumnHeader(JRVerticalFiller.java:534)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:154)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:615)
at net.sf.jasperreports.engine.fill.JRFillSubreport.fillSubreport(JRFillSubreport.java:822)
at net.sf.jasperreports.engine.fill.JRSubreportRunnable.run(JRSubreportRunnable.java:61)
at net.sf.jasperreports.engine.fill.AbstractThreadSubreportRunner.run(AbstractThreadSubreportRunner.java:221)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

这个问题可以以多种方式重现，但我使用的是最简单的场景。我附上了简单的jrxml文件供参考。我使用了一个数据集为空的表。我使用了文本字段表达式来显示数据。我已将isStretchWithOverflow设置为true

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="Table_Based" pageWidth="842" pageHeight="595" orientation="Landscape" whenNoDataType="AllSectionsNoDetail" columnWidth="802" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="66519d71-4f27-4833-9a1d-c9b72e811f0c">
<property name="template.engine" value="tabular_template"/>
<property name="com.jaspersoft.studio.data.sql.tables" value=""/>
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Sample DB"/>
<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="Row" mode="Transparent">
    <conditionalStyle>
        <conditionExpression><![CDATA[$V{REPORT_COUNT}%2 == 0]]></conditionExpression>
        <style backcolor="#E6DAC3"/>
    </conditionalStyle>
</style>
<style name="Table">
    <box>
        <pen lineWidth="1.0" lineColor="#000000"/>
        <topPen lineWidth="1.0" lineColor="#000000"/>
        <leftPen lineWidth="1.0" lineColor="#000000"/>
        <bottomPen lineWidth="1.0" lineColor="#000000"/>
        <rightPen lineWidth="1.0" lineColor="#000000"/>
    </box>
</style>
<style name="Table_TH" mode="Opaque" backcolor="#F0F8FF">
    <box>
        <pen lineWidth="0.5" lineColor="#000000"/>
        <topPen lineWidth="0.5" lineColor="#000000"/>
        <leftPen lineWidth="0.5" lineColor="#000000"/>
        <bottomPen lineWidth="0.5" lineColor="#000000"/>
        <rightPen lineWidth="0.5" lineColor="#000000"/>
    </box>
</style>
<style name="Table_CH" mode="Opaque" backcolor="#BFE1FF">
    <box>
        <pen lineWidth="0.5" lineColor="#000000"/>
        <topPen lineWidth="0.5" lineColor="#000000"/>
        <leftPen lineWidth="0.5" lineColor="#000000"/>
        <bottomPen lineWidth="0.5" lineColor="#000000"/>
        <rightPen lineWidth="0.5" lineColor="#000000"/>
    </box>
</style>
<style name="Table_TD" mode="Opaque" backcolor="#FFFFFF">
    <box>
        <pen lineWidth="0.5" lineColor="#000000"/>
        <topPen lineWidth="0.5" lineColor="#000000"/>
        <leftPen lineWidth="0.5" lineColor="#000000"/>
        <bottomPen lineWidth="0.5" lineColor="#000000"/>
        <rightPen lineWidth="0.5" lineColor="#000000"/>
    </box>
</style>
<subDataset name="tableDataset" uuid="bcc32bbf-2279-43e0-8149-66ee3e913b5e">
    <property name="com.jaspersoft.studio.data.defaultdataadapter" value="Sample DB"/>
    <queryString language="SQL">
        <![CDATA[]]>
    </queryString>
</subDataset>
<subDataset name="Dataset1" uuid="13d74fad-eb9b-446f-a81d-55b8cf6ea0db">
    <queryString>
        <![CDATA[]]>
    </queryString>
</subDataset>
<queryString>
    <![CDATA[]]>
</queryString>
<title>
    <band height="113" splitType="Stretch">
        <staticText>
            <reportElement style="Title" x="270" y="0" width="263" height="62" uuid="a080d2ca-6207-4d8e-87c9-d3b61fb495a9"/>
            <textElement verticalAlignment="Middle"/>
            <text><![CDATA[Report Title]]></text>
        </staticText>
        <staticText>
            <reportElement style="SubTitle" x="303" y="62" width="196" height="22" uuid="0d849401-f944-4163-9df0-f69408a0618a"/>
            <textElement>
                <font fontName="Times New Roman"/>
            </textElement>
            <text><![CDATA[Report SubTitle]]></text>
        </staticText>
    </band>
</title>
<summary>
    <band height="112" splitType="Stretch">
        <property name="local_mesure_unitheight" value="pixel"/>
        <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.grid.JSSGridBagLayout"/>
        <componentElement>
            <reportElement stretchType="ContainerBottom" x="0" y="0" width="802" height="112" isPrintWhenDetailOverflows="true" uuid="f3767496-0434-4f42-862b-5839d580e423">
                <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.HorizontalRowLayout"/>
                <property name="com.jaspersoft.studio.table.style.table_header" value="Table_TH"/>
                <property name="com.jaspersoft.studio.table.style.column_header" value="Table_CH"/>
                <property name="com.jaspersoft.studio.table.style.detail" value="Table_TD"/>
            </reportElement>
            <jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" whenNoDataType="AllSectionsNoDetail">
                <datasetRun subDataset="Dataset1" uuid="05c4f663-c370-4c53-b332-ae9dfb9590e0"/>
                <jr:column width="170" uuid="a3e3c62f-3558-42a1-a701-ad31853970a9">
                    <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column1"/>
                    <jr:tableHeader style="Table_TH" height="30" rowSpan="1">
                        <staticText>
                            <reportElement x="0" y="0" width="170" height="30" uuid="a5ddd2d9-992d-41d2-a7d0-4cc7ec29350b"/>
                            <textElement>
                                <font size="20"/>
                            </textElement>
                            <text><![CDATA[Number]]></text>
                        </staticText>
                    </jr:tableHeader>
                    <jr:columnHeader style="Table_CH" height="30" rowSpan="1">
                        <textField>
                            <reportElement positionType="Float" stretchType="ElementGroupHeight" x="0" y="0" width="170" height="30" uuid="b4f24d97-8dbe-42e8-81a8-34fb336eabef"/>
                            <textFieldExpression><![CDATA[$V{REPORT_COUNT}]]></textFieldExpression>
                        </textField>
                    </jr:columnHeader>
                    <jr:detailCell style="Table_TD" height="40" rowSpan="1"/>
                </jr:column>
                <jr:column width="173" uuid="e2eaa014-ebfd-4795-b752-476ca2fa8f0b">
                    <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column2"/>
                    <jr:tableHeader style="Table_TH" height="30" rowSpan="1">
                        <staticText>
                            <reportElement x="0" y="0" width="173" height="30" uuid="b80ae7ce-3491-45cd-963d-8638f03a3891"/>
                            <textElement>
                                <font size="20"/>
                            </textElement>
                            <text><![CDATA[Text]]></text>
                        </staticText>
                    </jr:tableHeader>
                    <jr:columnHeader style="Table_CH" height="30" rowSpan="1">
                        <textField isStretchWithOverflow="true" isBlankWhenNull="true">
                            <reportElement positionType="Float" x="0" y="0" width="173" height="30" isPrintWhenDetailOverflows="true" uuid="a2647f94-9054-4efd-904e-0850eead4cdf"/>
                            <textElement>
                                <paragraph lineSpacing="1_1_2"/>
                            </textElement>
                            <textFieldExpression><![CDATA[UPPER("qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm qwertyuiopasdfghjklzxcvbnm")]]></textFieldExpression>
                        </textField>
                    </jr:columnHeader>
                    <jr:detailCell style="Table_TD" height="40">
                        <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.HorizontalRowLayout"/>
                    </jr:detailCell>
                </jr:column>
            </jr:table>
        </componentElement>
    </band>
</summary>

---

你需要重新设计你的报告

当前，您希望在每个页面上都有一个列标题，但您的列标题不适合该页面，所以发生的是

创建列标题（因为表或新页的开头）

切换到新页面（因为它不适合）

从新页面转到1

net.sf.jasperreports.engine.JRRuntimeException:由于列标题溢出，无限循环创建新页

---

您的解决方案可以是缩小文本、增大列或截断文本以使其适合页面。

谢谢@PetterFriberg。问题是，我有一些数据会迫使一个单元格占据两页。我已经更正了上面的JRXML，以便在单元格中详细显示数据。现在抛出NullpointerException。@AmitValvekar抱歉，您需要通过一个新问题，如果您更改当前问题，我的答案没有意义anymore@PeterFriberg，如果你坚持的话，我当然可以提出一个新问题，但问题仍然是一样的。如果表详细信息单元格或标题单元格的内容太大，无法容纳在一个页面中，则会引发运行时异常。不幸的是，您的解决方案可能无法在我的实际代码中工作，因为我有多个动态列和大数据。再次感谢您的输入。@AmitValvekar yes请发布一个新问题，因为您的第一个问题是设计问题，而Nullpointer问题（设计良好）可能是最新JasperSoftStudio v6.6.0中的一个错误（我可以在旧版本中运行该报告，删除不支持的stretchType）。如果您希望我确切地调查它是否是一个bug，以及可以使用什么解决方法，您可以在这里ping我。

2018-09-21 17:03:26,667 ERROR RenderViewExceptionInterceptor,http-nio-8080-exec-8:55 - Internal server error occurred. Please contact your system administrator.
java.lang.NullPointerException
at net.sf.jasperreports.components.table.util.TableUtil.getAllColumns(TableUtil.java:162)
at net.sf.jasperreports.components.headertoolbar.json.HeaderToolbarElementJsonHandler.getColumnGroupsData(HeaderToolbarElementJsonHandler.java:832)
at net.sf.jasperreports.components.headertoolbar.json.HeaderToolbarElementJsonHandler.getJsonFragment(HeaderToolbarElementJsonHandler.java:237)
at net.sf.jasperreports.engine.export.JsonExporter.exportGenericElement(JsonExporter.java:487)