JasperReport gerar um relatorio do Swing para impressora

impressao = JasperFillManager.fillReport(relJasper, parametros, ds);

Exception in thread "main" java.lang.NullPointerException
        at java.io.ObjectInputStream$PeekInputStream.read(ObjectInputStream.java:2264)
        at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2277)
        at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2748)
        at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:780)
        at java.io.ObjectInputStream.<init>(ObjectInputStream.java:280)
        at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:191)
        at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:580)
        at formulario.Main.exibir(Main.java:67)
        at formulario.Main.main(Main.java:78)
Java Result: 1

public class Main {
   
    /** Creates a new instance of Main */
    public Main() {
    }
   
    /**
     * @param args the command line arguments
     */
   
    public void exibir(){
          // cria objeto estabelecimento
        Estabelecimento estabelecimento = new Estabelecimento();
        estabelecimento.setNome("Teste 123");
       
       
        // gera e imprime
       
        // Caminho do .jasper do relatorio
        String caminhoRelJasper = "c:\\Atestado.jasper";
       
        // Lista com beans
        //List listaLivros = getLivros();
        List lista = new ArrayList();
        lista.add(estabelecimento);
       
        // Stream com o .jasper
       
        InputStream relJasper = getClass().getResourceAsStream(caminhoRelJasper);
       
        // O datasource
       
        JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(lista);
       
        // Parametros do relatorios
        Map parametros = new HashMap();
       
        JasperPrint impressao = null;
        try {
           
            impressao = JasperFillManager.fillReport(relJasper, parametros, ds);
            JasperViewer viewer = new JasperViewer(impressao, true);
            viewer.setVisible(true);
           
        } catch (JRException e) {
            System.out.println(e.getMessage());
        }
    }
    public static void main(String[] args) {
        // TODO code application logic here
       System.out.println("Inicio");
        new Main().exibir();
       System.out.println("Termino");
    }
   
}