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    <p>As stated by Tedil, you should give more memory to the app by launching with something like:</p> <pre><code>java -Xmx256m -classpath yourclasspath YourMainClass </code></pre> <p>To load the images with a "please wait" loading screen and a progress bar is tricky. It's already in the realm of Advanced Swing. If you are using Java 6 I recommend reading up the SwingWorker class.</p> <p>Here's a demo that shows you one approach:</p> <pre><code>package com.barbarysoftware; import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.image.BufferedImage; import java.util.List; public class ImageLoadingDemo { public static void main(String[] args) { final JFrame frame = new JFrame(); frame.setPreferredSize(new Dimension(600, 400)); frame.getContentPane().add(new JLabel("I'm the main app frame", JLabel.CENTER)); frame.pack(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocationRelativeTo(null); frame.setVisible(true); final JDialog pleaseWaitDialog = new JDialog(frame, "Loading images", true); final int imageCount = 50; final JProgressBar progressBar = new JProgressBar(0, imageCount); final BufferedImage[] images = loadImages(frame, pleaseWaitDialog, imageCount, progressBar); System.out.println("images = " + images); } private static BufferedImage[] loadImages(JFrame frame, final JDialog pleaseWaitDialog, final int imageCount, final JProgressBar progressBar) { final BufferedImage[] images = new BufferedImage[imageCount]; SwingWorker&lt;Void, Integer&gt; swingWorker = new SwingWorker&lt;Void, Integer&gt;() { @Override protected Void doInBackground() throws Exception { for (int i = 0; i &lt; imageCount; i++) { System.out.println("i = " + i); publish(i); Thread.sleep(1000); // to simulate the time needed to load an image // images[i] = ImageIO.read(new File("... path to an image file ...")); } return null; } @Override protected void process(List&lt;Integer&gt; chunks) { final Integer integer = chunks.get(chunks.size() - 1); progressBar.setValue(integer); } @Override protected void done() { pleaseWaitDialog.setVisible(false); } }; JPanel panel = new JPanel(); panel.add(progressBar); panel.add(new JButton(new AbstractAction("Cancel") { public void actionPerformed(ActionEvent e) { System.exit(0); } })); pleaseWaitDialog.getContentPane().add(panel); pleaseWaitDialog.pack(); pleaseWaitDialog.setLocationRelativeTo(frame); swingWorker.execute(); pleaseWaitDialog.setVisible(true); return images; } } </code></pre>
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