我正在使用此应用程序，以便使用JRDataSource接口生成报告。我想我做得很好，但是很明显我错过了什么。我正在尝试做一个GUI，我可以在其中引入4个参数，通过在列表中捕获事件（按钮onClick）来保存它们，并使用另一个按钮onClick将其打印在使用JRDataSource的报告中。我的猜测是与onClick第二个事件（打印报告）相关的东西，因为直到那里应用程序运行良好。
您可以看到我的代码以及NetBeans在此处抛出的异常。
英语不是我的母语，儿子我很抱歉，如果我没有很好地解释它。
主类：
package di_t4;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class DI_T4 extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("FXMLFichaAlumno.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
来自FXMLController的活动：
@FXML
private void guardar(ActionEvent event) {
//Botón correspondiente al botón guardar
String dniVal = txtDNI.getText();
String modVal = cmbModulo.getValue();
int notaVal = spnNota.getValue();
double recuperaVal = spnRecuperacio.getValue();
if (dniVal.isEmpty()) {
Alert alerta = new Alert(Alert.AlertType.ERROR);
alerta.setTitle("ALERT DNI FAIL");
alerta.setContentText("El DNI que ha introducido no es correcto");
alerta.showAndWait();
return;
}
Nota nota = new Nota(dniVal, modVal, notaVal, recuperaVal);
tbNotas.getItems().add(nota);
listaNota.addNota(nota);
// notaAlmacenada.insertarNota(nota);
//limpiamos variables
txtDNI.setText("");
cmbModulo.setValue("DI");
spnNota.setValueFactory(new SpinnerValueFactory.IntegerSpinnerValueFactory(0, 10, 5));
spnRecuperacio.setValueFactory(new SpinnerValueFactory.DoubleSpinnerValueFactory(0, 5, 0, 0.5));
}
@FXML
private void generaInforme(ActionEvent event) {
try {
JasperReport reporte = (JasperReport) JRLoader.loadObjectFromFile("InformeNotaAlumnos.jasper");
JasperPrint jasperPrint = JasperFillManager.fillReport(reporte, null, listaNota);
JasperViewer jviewer = new JasperViewer(jasperPrint);
jviewer.setVisible(true);
} catch (JRException jrex) {
System.out.println(jrex.getCause());
}
}
我试过把它放在initialize方法中，但它不会改变结果：
btnGuardar.setOnAction(this::guardar);
btnMostrarInforme.setOnAction(this::generaInforme);
这是JRDataSource类：
public class NotaDatasource implements JRDataSource {
private List<Nota> listaNota = new ArrayList<Nota>();
private int indiceNotaActual = -1;
@Override
public boolean next() throws JRException {
return ++indiceNotaActual < listaNota.size();
}
@Override
public Object getFieldValue(JRField jrf) throws JRException {
Object valor = null;
if ("dni".equals(jrf.getName())){
valor=listaNota.get(indiceNotaActual).getNota();
}
else if ("asignatura".equals(jrf.getName())){
valor=listaNota.get(indiceNotaActual).getAsignatura();
}
else if ("nota".equals(jrf.getName())){
valor=listaNota.get(indiceNotaActual).getNota();
}
else if ("notaRecuperacion".equals(jrf.getName())){
valor=listaNota.get(indiceNotaActual).getNotaRecuperacion();
}
return valor;
}
public void addNota(Nota nota) {
this.listaNota.add(nota);
}
}
这是输出异常：
Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1774)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8413)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
... 48 more
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at net.sf.jasperreports.engine.util.JRLoader.<clinit>(JRLoader.java:81)
at di_t4.FXMLFichaAlumnoController.generaInforme(FXMLFichaAlumnoController.java:125)
... 58 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 60 more
在输出中的某个时刻，它说：
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at net.sf.jasperreports.engine.util.JRLoader.<clinit>(JRLoader.java:81)
at di_t4.FXMLFichaAlumnoController.generaInforme(FXMLFichaAlumnoController.java:125)
它指的是来自FXMLController类的这一行，但我不认为这是真正的问题：
JasperReport reporte = (JasperReport) JRLoader.loadObjectFromFile("InformeNotaAlumnos.jasper");
对于这个looooong帖子感到抱歉，如果你能帮助我，我会非常高兴。
谢谢！