我已经从eclipse市场安装了Jasper studio 6.4.0并使用jasperdesigner来设计报告。
报告的数据源是xmldatasource
JRXmlDataSource dataSource = new JRXmlDataSource(xmlfile);
当我打电话的时候
JasperFillManager.fillReport(jasperReport,params, dataSource);
获取nullpointer异常（GenerateReport是我创建的类名）
这是我的异常堆栈：
java.lang.NullPointerException
at com.jaspersoft.studio.debug.TraceGovernor.setup(TraceGovernor.java:107)
at com.jaspersoft.studio.debug.TraceGovernor.initMaps(TraceGovernor.java:114)
at com.jaspersoft.studio.debug.TraceGovernor.beforeReportInit(TraceGovernor.java:158)
at net.sf.jasperreports.engine.fill.JRFillDatasetScriptlet.beforeReportInit(JRFillDatasetScriptlet.java:74)
at net.sf.jasperreports.engine.JRAbstractScriptlet.callBeforeReportInit(JRAbstractScriptlet.java:176)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReportStart(JRVerticalFiller.java:236)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:115)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:582)
at net.sf.jasperreports.engine.fill.BaseReportFiller.fill(BaseReportFiller.java:414)
at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:121)
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:667)
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:983)
at com.continental.benchmark.popup.actions.GenerateReport.fill(GenerateReport.java:186)
at com.continental.benchmark.popup.actions.GenerateReport.run(GenerateReport.java:140)
at org.eclipse.ui.internal.PluginAction.runWithEvent(PluginAction.java:247)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:565)
at org.eclipse.jface.action.ActionContributionItem.lambda$4(ActionContributionItem.java:397)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4418)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1079)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4236)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3824)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1121)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1022)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:150)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:693)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:610)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:138)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)
at org.eclipse.equinox.launcher.Main.run(Main.java:1519)
at org.eclipse.equinox.launcher.Main.main(Main.java:1492)
任何人都可以建议我解决方案。
Dummy.jrxml：
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.4.0.final using JasperReports Library version 6.4.1 -->
<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="Dummy" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="5e964e3f-1705-4bda-bc9a-2b3372dfeb58">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="Dummy Adapter "/>
<queryString language="XPath">
<![CDATA[/Dummy_Report/Author]]>
</queryString>
<field name="ID" class="java.lang.String">
<fieldDescription><![CDATA[ID]]></fieldDescription>
</field>
<field name="Name" class="java.lang.String">
<fieldDescription><![CDATA[Name]]></fieldDescription>
</field>
<field name="Version" class="java.lang.String">
<fieldDescription><![CDATA[Version]]></fieldDescription>
</field>
<background>
<band splitType="Stretch"/>
</background>
<title>
<band height="35" splitType="Stretch">
<staticText>
<reportElement x="0" y="0" width="555" height="35" uuid="f24c035a-72d3-427b-95a3-29156eb2c0c2"/>
<textElement textAlignment="Center" verticalAlignment="Middle">
<font fontName="Arial" size="20"/>
</textElement>
<text><![CDATA[Dummy Report]]></text>
</staticText>
</band>
</title>
<columnHeader>
<band height="31">
<staticText>
<reportElement x="0" y="0" width="100" height="30" uuid="d0cbab44-c38a-487a-8f02-532b8066e929"/>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[ID]]></text>
</staticText>
<staticText>
<reportElement x="100" y="0" width="300" height="30" uuid="b476b250-7316-4c72-b1ff-f669822070ea"/>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[Name]]></text>
</staticText>
<staticText>
<reportElement x="400" y="0" width="155" height="30" uuid="af4215b5-7e4a-4bf9-ab8c-77fcff396be6"/>
<textElement textAlignment="Center" verticalAlignment="Middle"/>
<text><![CDATA[Version]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="211" splitType="Stretch">
<textField>
<reportElement x="0" y="0" width="100" height="30" uuid="a0bf6c59-7422-4340-8fd4-b95851bd7777"/>
<textElement textAlignment="Center" verticalAlignment="Top"/>
<textFieldExpression><![CDATA[$F{ID}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="100" y="0" width="300" height="30" uuid="40a8a896-d1f6-48a1-9311-ae1264e91ecf"/>
<textElement textAlignment="Center" verticalAlignment="Top"/>
<textFieldExpression><![CDATA[$F{Name}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="400" y="0" width="155" height="30" uuid="3d8577ea-970b-4d52-9628-da81b1229cb2"/>
<textElement textAlignment="Center" verticalAlignment="Top"/>
<textFieldExpression><![CDATA[$F{Version}]]></textFieldExpression>
</textField>
</band>
</detail>
</jasperReport>
**GenerateReport.java**
import java.io.File;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileNameExtensionFilter;
import javax.swing.filechooser.FileSystemView;
import org.eclipse.core.resources.IFile;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IActionDelegate;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;
import org.w3c.dom.Document;
import com.continental.benchmark.benchmark.BenchmarkPackage;
import com.continental.benchmark.benchmark.Template;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JRParameter;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.data.JRMapArrayDataSource;
import net.sf.jasperreports.engine.data.JRXmlDataSource;
import net.sf.jasperreports.engine.export.JRPdfExporter;
import net.sf.jasperreports.engine.query.JRXPathQueryExecuterFactory;
import net.sf.jasperreports.engine.util.JRLoader;
import net.sf.jasperreports.engine.util.JRXmlUtils;
public class GenerateReport implements IObjectActionDelegate {
private Shell shell;
IFile file;
URI uriFile;
/**
* Constructor for Action1.
*/
public GenerateReport() {
super();
}
/**
* @see IObjectActionDelegate#setActivePart(IAction, IWorkbenchPart)
*/
public void setActivePart(IAction action, IWorkbenchPart targetPart) {
shell = targetPart.getSite().getShell();
}
/**
* @see IActionDelegate#run(IAction)
*/
public void run(IAction action){File outDir = new File("D://Report");
outDir.mkdirs();
/*try {
JasperExportManager.exportReportToPdfFile("C:/Users/uidk3332/Documents/Project/Benchmarking_Suite/src/main/com.continental.benchmark.reports/src/com/continental/benchmark/description/report/Benchmark_Description_Template.jrprint",
"D://Report//JasperOutput.pdf");
} catch (JRException e) {
e.printStackTrace();
}*/
JRPdfExporter exporter = new JRPdfExporter();
try {
exporter.setParameter(JRExporterParameter.JASPER_PRINT, fill());
} catch (JRException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, "D:/Report/Result.pdf");
try {
exporter.exportReport();
} catch (JRException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
/*} catch (JRException e) {
e.printStackTrace();
}*/
}
public JasperPrint fill() throws JRException
{
Map<String, Object> params = new HashMap<>();
JRMapArrayDataSourceDemo obj = new JRMapArrayDataSourceDemo();
JRMapArrayDataSource dataSource = obj.arrData();
params.put(JRXPathQueryExecuterFactory.XML_DATE_PATTERN, "yyyy-MM-dd");
params.put(JRXPathQueryExecuterFactory.XML_NUMBER_PATTERN, "#,##0.##");
params.put(JRXPathQueryExecuterFactory.XML_LOCALE, Locale.ENGLISH);
params.put(JRParameter.REPORT_LOCALE, Locale.US);
JasperPrint jasperPrintObj = JasperFillManager.fillReport(jasperReport,params, dataSource);
//System.out.println("---------------------------"+jasperPrint);
return jasperPrintObj;
}
}
JRMapArrayDataSourceDemo.java
public class JRMapArrayDataSourceDemo {
public JRMapArrayDataSource arrData()
{
Set<Employee> emp = new HashSet<>();
emp.add(new Employee("ghj", "95"));
emp.add(new Employee("abc", "958"));
emp.add(new Employee("def", "955"));
Map<String, String> employee = new HashedMap();
for(Employee ob: emp)
{
employee.put(ob.getName(), ob.getId());
}
Object[] data = {employee};
JRMapArrayDataSource dataSource = new JRMapArrayDataSource(data);
return dataSource;
}
}
class Employee
{
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
private String id;
Employee(String name, String id)
{
this.name = name;
this.id = id;
}
}
Dummy.xml
<Dummy_Report>
<Author>
<ID>95</ID>
<Name>fgh</Name>
</Author>
<Author>
<ID>985</ID>
<Name>abc</Name>
</Author>
<Author>
<ID>958</ID>
<Name>def</Name>
</Author>
</Dummy_Report>
谢谢