java.lang.Error:java.lang.reflect.InvocationTargetException

我试图实例化JasperReport对象，但它在线程中出现错误异常

"AWT-EventQueue-0" java.lang.Error: java.lang.reflect.InvocationTargetException
    at org.jdesktop.application.ApplicationAction.actionFailed(ApplicationAction.java:859)
    at org.jdesktop.application.ApplicationAction.noProxyActionPerformed(ApplicationAction.java:665)
    at org.jdesktop.application.ApplicationAction.actionPerformed(ApplicationAction.java:698)
    at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
    at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
    at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
    at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
Hibernate: select categories0_.CategoryID as Category1_11_0_, categories0_.parent as parent2_11_0_, categories0_.CategoryName as Category3_11_0_, categories0_.Description as Descript4_11_0_ from categories categories0_ where categories0_.CategoryID=?
    at java.desktop/javax.swing.AbstractButton.doClick(AbstractButton.java:369)
    at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1020)
    at java.desktop/javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1064)
    at java.desktop/java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:297)
    at java.desktop/java.awt.Component.processMouseEvent(Component.java:6636)
    at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
    at java.desktop/java.awt.Component.processEvent(Component.java:6401)
    at java.desktop/java.awt.Container.processEvent(Container.java:2263)
    at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5012)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4844)
    at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4919)
    at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4548)
    at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4489)
    at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
    at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2764)
    at java.desktop/java.awt.Component.dispatchEvent(Component.java:4844)
    at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
    at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)
    at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
    at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
    at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
    at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
    at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
    at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.desktop/java.awt.EventDispatchThread.run(Hibernate: select categories0_.CategoryID as Category1_11_0_, categories0_.parent as parent2_11_0_, categories0_.CategoryName as Category3_11_0_, categories0_.Description as Descript4_11_0_ from categories categories0_ where categories0_.CategoryID=?
EventDispatchThread.java:90)
Caused by: java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.jdesktop.application.ApplicationAction.noProxyActionPerformed(ApplicationAction.java:662)
    ... 39 more
Caused by: java.lang.NullPointerException
    at net.sf.jasperreports.engine.design.JRAbstractCompiler.deleteSourceFiles(JRAbstractCompiler.java:407)
    at net.sf.jasperreports.engine.design.JRAbstractCompiler.compileReport(JRAbstractCompiler.java:281)
    at net.sf.jasperreports.engine.JasperCompileManager.compile(JasperCompileManager.java:358)
    at net.sf.jasperreports.engine.JasperCompileManager.compile(JasperCompileManager.java:344)
    at net.sf.jasperreports.engine.JasperCompileManager.compileReport(JasperCompileManager.java:609)
    at forms.EvidentaMijloaceFixe.ImprimaListaOMVSD(EvidentaMijloaceFixe.java:1537)
    ... 44 more

这是我的代码：

public void ImprimaListaOMVSD() {   titluRaport = "LISTA FISELOR OMVSD";
    list = HibernateUtil.getInstance().getOMVSDList();
    try {
        jasperReportOrders = JasperCompileManager.compileReport(this.getClass().getClassLoader()
                .getResourceAsStream("reports/ListaMF.jrxml"));

    } catch (JRException ex) {
        System.out.print(ex.toString());
        Logger.getLogger(EvidentaMijloaceFixe.class.getName()).log(Level.SEVERE, null, ex);
    }
    try {

        mapParams.put("denEntit", entitatea.getCompanyName());
        mapParams.put("catObiect", titluRaport);
        mapParams.put("codFisc", entitatea.getRegistrationCode());
        mapParams.put("dataDin", jDateDin.getDate());
        mapParams.put("dataPina", jDatePina.getDate());
        JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(list);
        jasperPrint = JasperFillManager.fillReport(jasperReportOrders, mapParams, ds);
        JasperViewer.viewReport(jasperPrint, false);
    } catch (JRException ex) {
        System.err.print(ex);
    }
}

---

显然，用于查询数据库的表的路径为空。尝试在数据库的表引用中查看代码。如果可以，您可以发布一段代码，我会更精确地查看。

显示代码。顺便说一句，您不必实例化JasperReport对象，它们是由JasperReports编译器在comile时间或在运行时通过代码创建的……我如何发布代码？