Why is my macOS JAR application lagging or crashing when using OSXAdapter, and how can I fix it?

JAR Bundler using OSXAdapter causing application to lag or terminate

When using OSXAdapter to handle double-clicking JAR files associated with your application on macOS, you may encounter issues with lag or the application terminating. This could be due to blocking the event dispatch thread (EDT).

Solution:

To resolve this issue, consider the following:

1. Use SwingWorker or Runnable:

   • SwingWorker is a convenient way to perform background tasks and update the UI on the EDT.
   • Alternatively, you can use a custom Runnable to perform the required actions, as shown in the code snippet below.

2. Remove the Sleep on the EDT:

   • Your Controller currently sleeps on the EDT for 10 seconds. This can cause the application to lag. Move the sleep operation to a background thread or use a SwingWorker or Runnable to avoid blocking the EDT.

Alternative Approaches:

1. Avoid JAR Bundler:

   • Consider using an alternative method to bundle your application for macOS, such as the approach shown in the referenced project.

2. MVC Architecture:

   • Employ MVC architecture to separate the model, view, and controller components of your application. This can help improve synchronization and resolve potential issues.

Addendum:

• Implementing the isDispatchThread() method in your Controller can help determine if the EDT is being blocked.
• The linked project includes a working example of an MVC architecture implementation and bundle creation without JAR Bundler.
• Investigate other approaches to auto-scrolling a JTable, such as those demonstrated in the provided code snippet.

Code Snippet:

The following code demonstrates how to use a Runnable to perform the task and avoid blocking the EDT:

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class TableAddTest extends JPanel implements Runnable {

    private static final int N_ROWS = 8;
    private static String[] header = {"ID", "String", "Number", "Boolean"};
    private DefaultTableModel dtm = new DefaultTableModel(null, header);
    private JTable table = new JTable(dtm);
    private JScrollPane scrollPane = new JScrollPane(table);

    public TableAddTest() {
        this.setLayout(new BorderLayout());
        scrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
        this.add(scrollPane, BorderLayout.CENTER);
        JPanel panel = new JPanel();
        panel.add(new JButton(new AbstractAction("Add Row") {

            @Override
            public void actionPerformed(ActionEvent e) {
                EventQueue.invokeLater(TableAddTest.this);
            }
        }));
        this.add(panel, BorderLayout.SOUTH);
    }

    private void addRow() {
        dtm.addRow(new Object[]{
                Character.valueOf('A' + dtm.getRowCount()),
                Character.valueOf('A') + dtm.getRowCount(),
                Integer.valueOf(dtm.getRowCount()),
                Boolean.valueOf(dtm.getRowCount() % 2 == 0)
            });
    }

    @Override
    public void run() {
        addRow();
        table.scrollRectToVisible(table.getCellRect(dtm.getRowCount() - 1, 0, true));
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                JFrame f = new JFrame();
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.add(new TableAddTest());
                f.pack();
                f.setLocationRelativeTo(null);
                f.setVisible(true);
                new Thread(new TableAddTest()).start();
            }
        });
    }
}

Note: The highlighted portions of the code show how to use EventQueue.invokeLater() to update the GUI on the EDT while using a Runnable to perform the task.

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