JTextPane text collapsing on scroll in Mac os

Question

I am creating a simple JTextPane and setting a long text after viewport setting, but when I run program in Mac os 10.11.5, my JTextPane text lines collapses with each other. When I scroll slowly it does not happen, but when I scroll little fast it starts collapsing. This problem is not occurring in windows. Here is my sample source code:

public class JTextPaneScroll extends javax.swing.JFrame {

    private String s = "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "\n For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity."
        + "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "\n For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity."
        + "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "\n For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity.";

    public JTextPaneScroll() {
        initComponents();
        setTextToPane();
    }
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          

    private void initComponents() {

        jspcomp = new javax.swing.JScrollPane();
        comp = new javax.swing.JTextPane();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());

        jspcomp.setViewportView(comp);

        getContentPane().add(jspcomp, new org.netbeans.lib.awtextra.AbsoluteConstraints(30, 20, 290, 180));

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

    private void setTextToPane() {
        try {
            comp.setText(s);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            javax.swing.UIManager.setLookAndFeel(javax.swing.UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(JTextPaneScroll.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(JTextPaneScroll.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(JTextPaneScroll.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(JTextPaneScroll.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new JTextPaneScroll().setVisible(true);
            }
        });
    }

// Variables declaration - do not modify                     
    private javax.swing.JTextPane comp;
    private javax.swing.JScrollPane jspcomp;
// End of variables declaration                   
}

Answer 1

JTextPane is Scrollable, so you can make it any preferred size you want and still use any layout you want. Components get added to the BorderLayout.CENTER of the JFrame by default. You can resize the frame to see what happens.

textPane = new javax.swing.JTextPane() {
    @Override
    public Dimension getPreferredScrollableViewportSize() {
        return new Dimension(290, 192);
    }
};

import java.awt.Dimension;

public class JTextPaneScroll extends javax.swing.JFrame {

    private javax.swing.JTextPane textPane;
    private javax.swing.JScrollPane scrollPane;

    private String s = ""
        + "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity.\n"
        + "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity.\n"
        + "Wait! Some of your past questions have not been well-received, and you're in danger of being blocked from asking any more.\n"
        + "For help formulating a clear, useful question, see: How do I ask a good question?\n"
        + "Also, edit your previous questions to improve formatting and clarity.\n";

    public JTextPaneScroll() {
        initComponents();
        setTextToPane();
    }

    private void initComponents() {
        scrollPane = new javax.swing.JScrollPane();
        textPane = new javax.swing.JTextPane() {
            @Override
            public Dimension getPreferredScrollableViewportSize() {
                return new Dimension(290, 192);
            }
        };
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        scrollPane.setViewportView(textPane);
        add(scrollPane);
        pack();
    }

    private void setTextToPane() {
        try {
            textPane.setText(s);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    public static void main(String args[]) {
        try {
            javax.swing.UIManager.setLookAndFeel(javax.swing.UIManager.getSystemLookAndFeelClassName());
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(JTextPaneScroll.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }

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