Conexão com jasper studio erro

imprimir o relatorio

Connection con = connection.ConnectionFactory.getConnection();

    int confirma = JOptionPane.showConfirmDialog(null, "confirma a impressão do relatorio?","Atenção",JOptionPane.YES_NO_OPTION);
    if(confirma == JOptionPane.YES_OPTION){
        
       //String src = "C:/Usersivan/Desktop/OrdemServico/teste.jasper";
        //InputStream srcStrem = getClass().getResourceAsStream(src);

      JasperPrint jasperPrint = null;
        
        try {
            URL arquivo = getClass().getResource("C:/Usersivan/Desktop/OrdemServico/teste.jasper");
            JasperReport jasperReport = (JasperReport) JRLoader.loadObject( arquivo );
            
            jasperPrint = JasperFillManager.fillReport(jasperReport, null,con );
            
        } catch (JRException err) {
           JOptionPane.showConfirmDialog(rootPane,"erro ao gerar relatorio /n"+ err);               
        }
        JasperViewer view = new JasperViewer(jasperPrint, false);
        view.setVisible(true);
        
    }

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:208)
	at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:192)
	at views.TelaOrdeServico.btnEmitirActionPerformed(TelaOrdeServico.java:645)
	at views.TelaOrdeServico.access$100(TelaOrdeServico.java:48)
	at views.TelaOrdeServico$3.actionPerformed(TelaOrdeServico.java:505)
	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
	at java.awt.Component.processMouseEvent(Component.java:6533)
	at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
	at java.awt.Component.processEvent(Component.java:6298)
	at java.awt.Container.processEvent(Container.java:2236)
	at java.awt.Component.dispatchEventImpl(Component.java:4889)
	at java.awt.Container.dispatchEventImpl(Container.java:2294)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
	at java.awt.Container.dispatchEventImpl(Container.java:2280)
	at java.awt.Window.dispatchEventImpl(Window.java:2746)
	at java.awt.Component.dispatchEvent(Component.java:4711)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.awt.EventQueue$4.run(EventQueue.java:729)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Graphics(621-1) Enabling debug

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