Why is a Joptionpane not modal on top of a JDialog

Question

I have used a JOptionpane as an error message which is invoked by a wrong user input on a JDialog.

Modality Type : APPLICATION MODAL
modalExclusionType : APPLICATION_EXCLUDE

The problem is when the JOptionpane appears the JDialog is still functional. Below is the code of invoking the JOptionpane

   JOptionPane.showMessageDialog(JDialog's name, "you must fill in all required fields", "Error!", 0);

Is there any way to fix this?

here is a minimal example programme

import javax.swing.JOptionPane;


public class Modality extends javax.swing.JFrame {


    public Modality() {
        initComponents();
    }


    private void initComponents() {

        jDialog1 = new javax.swing.JDialog();
        jTextField1 = new javax.swing.JTextField();
        jButton2 = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();

        jDialog1.setModalExclusionType(java.awt.Dialog.ModalExclusionType.APPLICATION_EXCLUDE);
        jDialog1.setModalityType(java.awt.Dialog.ModalityType.APPLICATION_MODAL);

        jButton2.setText("JOptionpane");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jLabel1.setText("Type in the textfield while the jdialog is visible");

        javax.swing.GroupLayout jDialog1Layout = new javax.swing.GroupLayout(jDialog1.getContentPane());
        jDialog1.getContentPane().setLayout(jDialog1Layout);
        jDialog1Layout.setHorizontalGroup(
            jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jDialog1Layout.createSequentialGroup()
                .addGroup(jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jDialog1Layout.createSequentialGroup()
                        .addGap(109, 109, 109)
                        .addComponent(jButton2))
                    .addGroup(jDialog1Layout.createSequentialGroup()
                        .addGap(76, 76, 76)
                        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 154, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(jDialog1Layout.createSequentialGroup()
                        .addGap(50, 50, 50)
                        .addComponent(jLabel1)))
                .addContainerGap(82, Short.MAX_VALUE))
        );
        jDialog1Layout.setVerticalGroup(
            jDialog1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jDialog1Layout.createSequentialGroup()
                .addGap(111, 111, 111)
                .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(jButton2)
                .addGap(18, 18, 18)
                .addComponent(jLabel1)
                .addContainerGap(96, Short.MAX_VALUE))
        );

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setText(" View JDialog");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(97, 97, 97)
                .addComponent(jButton1)
                .addContainerGap(122, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(101, 101, 101)
                .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 51, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(105, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

        jDialog1.pack();
        jDialog1.setVisible(true);
    }

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {

        JOptionPane.showMessageDialog(jDialog1, "Hello World! What's wrong with focus?");
    }



    public static void main(String args[]) {


        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Modality.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Modality.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Modality.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Modality.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>


        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Modality().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JDialog jDialog1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JTextField jTextField1;

}

Answer 1

The problem is here:

modalExclusionType : APPLICATION_EXCLUDE

Per the Window API:

Specifies the modal exclusion type for this window. If a window is modal excluded, it is not blocked by some modal dialogs. See Dialog.ModalExclusionType for possible modal exclusion types.

If you don't set this, then the JOptionPane blocks the dialog window just fine.