Why Does My Java App Lag or Crash After Using OSXAdapter for File Drops?

JAR Bundler using OSXAdapter causes application to lag or terminate

In the described scenario, a Java application experiences performance issues and abnormal behavior after incorporating the OSXAdapter library to handle file drop events on macOS. The problem likely originates from blocking the event dispatch thread (EDT) while performing time-consuming tasks.

To resolve this, the application should be modified to perform these tasks on a separate thread while updating the model on the EDT. SwingWorker, with its process() method, offers a suitable mechanism for this. Alternatively, invokeLater() can be used as exemplified in the provided code.

Incorrect Threading

1. Incorrect Approach:

   • The Controller class sleeps (blocks the EDT) for 10 seconds.

2. Recommended Approach:

   • Perform time-consuming tasks in a separate thread and update the GUI on the EDT using SwingWorker or invokeLater().

Example SwingWorker Implementation

public class Controller extends SwingWorker{

    public Controller() {
        execute(); // Starts the SwingWorker thread
    }

    @Override
    // Perform the time-consuming tasks (i.e., adding rows to the table) in a background thread.
    protected Void doInBackground() {
        // ....
        return null;
    }

    @Override
    // Update the GUI on the EDT after the background task is complete.
    protected void done() {
        // ....
    }
}

Additional Considerations

• Ensure that the isDispatchThread() method is invoked in the Controller to check if the EDT is being blocked.
• Refer to the provided GitHub project for MVC architecture and Mac OS application bundle creation without JAR Bundler.
• Explore the JTable auto-scrolling technique presented in the example.
• Investigate alternative approaches as suggested in the provided link.

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