Jpanel not showing when clicking run in netbeans

Question

i'm currently working on a java desktop project , oddly enough whenever i hit the run button , the Jpanel doesn't show up. I declared this as main but still it doesn't works. Any ideas ?

Here is the code for my Jpanel form.

Thanks in advance!.

package consumidor;


public class ventana extends javax.swing.JPanel {


     public ventana() {
        initComponents();
    }

     public static void main(String args[]) {

        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new ventana().setVisible(true);
            }
        });
    }


    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jInternalFrame1 = new javax.swing.JInternalFrame();
        jPanel2 = new javax.swing.JPanel();
        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        buscarProductoTxt = new javax.swing.JTextField();
        btnBuscarProducto = new javax.swing.JButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        buscarProductoArea = new javax.swing.JTextArea();

        jInternalFrame1.setVisible(true);

        javax.swing.GroupLayout jInternalFrame1Layout = new javax.swing.GroupLayout(jInternalFrame1.getContentPane());
        jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout);
        jInternalFrame1Layout.setHorizontalGroup(
            jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 0, Short.MAX_VALUE)
        );
        jInternalFrame1Layout.setVerticalGroup(
            jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 0, Short.MAX_VALUE)
        );

        jLabel1.setFont(new java.awt.Font("Tahoma", 1, 12)); // NOI18N
        jLabel1.setText("Buscar producto por rut");

        jLabel2.setText("Ingresar rut del proveedor");

        buscarProductoTxt.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                buscarProductoTxtActionPerformed(evt);
            }
        });

        btnBuscarProducto.setText("Consultar");
        btnBuscarProducto.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btnBuscarProductoActionPerformed(evt);
            }
        });

        buscarProductoArea.setColumns(20);
        buscarProductoArea.setRows(5);
        jScrollPane1.setViewportView(buscarProductoArea);

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(jLabel1)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(buscarProductoTxt, javax.swing.GroupLayout.PREFERRED_SIZE, 65, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(18, 18, 18)
                        .addComponent(btnBuscarProducto))
                    .addComponent(jScrollPane1))
                .addContainerGap(24, Short.MAX_VALUE))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jLabel1)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(buscarProductoTxt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(btnBuscarProducto, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 0, Short.MAX_VALUE))
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 56, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 324, Short.MAX_VALUE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
        );
    }// </editor-fold>                        




    private void buscarProductoTxtActionPerformed(java.awt.event.ActionEvent evt) {                                                  

    }                                                 

    private void btnBuscarProductoActionPerformed(java.awt.event.ActionEvent evt) {                                                  

        String producto=buscarProductoTxt.getText();
        buscarProductoRut(producto);
        buscarProductoArea.setText("Rut proveedor: "+mostrarRut()+", Descripcion"
                + ": "+mostrarDecripcion());





    }                                                 


    // Variables declaration - do not modify                     
    private javax.swing.JButton btnBuscarProducto;
    private javax.swing.JTextArea buscarProductoArea;
    private javax.swing.JTextField buscarProductoTxt;
    private javax.swing.JInternalFrame jInternalFrame1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JScrollPane jScrollPane1;
    // End of variables declaration                   

    private static boolean buscarProductoRut(java.lang.String arg0) {
        webservice.ProcesoProductos_Service service = new webservice.ProcesoProductos_Service();
        webservice.ProcesoProductos port = service.getProcesoProductosPort();
        return port.buscarProductoRut(arg0);
    }

    private static String mostrarRut() {
        webservice.ProcesoProductos_Service service = new webservice.ProcesoProductos_Service();
        webservice.ProcesoProductos port = service.getProcesoProductosPort();
        return port.mostrarRut();
    }

    private static String mostrarDecripcion() {
        webservice.ProcesoProductos_Service service = new webservice.ProcesoProductos_Service();
        webservice.ProcesoProductos port = service.getProcesoProductosPort();
        return port.mostrarDecripcion();
    }        
}

Answer 1

Nothing "odd" about this. Your ventana class is a JPanel, and yes, you create it and set it visible, but a JPanel by itself can not display, and to in fact have it show, it needs to be part of a visible "top-level window" such as a JFrame or JDialog. So if you want to show this JPanel in its own separate dialog window, put it into a JDialog, pack() the dialog, and then set the dialog visible. Or the quick and dirty way to do this is to put the ventana JPanel into a JOptionPane. e.g.,

 JOptionPane.showMessageDialog(null, new ventana());

A JOptionPane will then create and display a modal JDialog that will display your ventana object.

Note that the ventana class name should begin with an upper-case letter, like all Java class names should.