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copied!<p>The viewable area/space is defined (in most cases) by the view's preferred size. This suggests that your problem lies with your scroll panes view and not the scroll pane or anything else you've provided us</p> <p><img src="https://i.stack.imgur.com/05reW.png" alt="enter image description here"></p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Graphics; import java.awt.GridBagLayout; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; public class TestScrollPane02 { public static void main(String[] args) { new TestScrollPane02(); } public TestScrollPane02() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JFrame frame = new JFrame("Testing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(new JScrollPane(new LargePane())); frame.setSize(200, 200); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class LargePane extends JPanel { public LargePane() { setLayout(new GridBagLayout()); add(new JLabel("I'm a large panel")); } @Override public Dimension getPreferredSize() { return new Dimension(400, 400); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.RED); g.drawLine(0, 0, getWidth(), getHeight()); g.drawLine(getWidth(), 0, 0, getHeight()); } } } </code></pre> <p>You can also have a look the <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/Scrollable.html" rel="nofollow noreferrer">Scrollable</a> interface which provides additional hints back to the scroll pane...</p>

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