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    <p>I am unable to reproduce the effect you describe on 1.6; you might try the <a href="http://sscce.org/" rel="nofollow noreferrer">sscce</a> below on 1.7. Note, several suggestions for your example:</p> <ul> <li><p>Avoid <code>setXxxxSize()</code>, as discussed <a href="https://stackoverflow.com/q/7229226/230513">here</a>. If you just want a 30 pixel high bar in <code>SOUTH</code>, override <code>getPreferredSize()</code> as shown below. If you later decide to add components, you'll need to add a layout manager.</p> <pre><code>@Override public Dimension getPreferredSize() { return new Dimension(0, 30); } </code></pre></li> <li><p>Use <code>pack()</code> to let the <code>Window</code> adopt the preferred sizes of the enclosed components. I've added an arbitrary size <code>JPanel</code> to the <code>CENTER</code>; resize the frame to see how the bar grows horizontally in <code>SOUTH</code>.</p></li> <li><p>Swing GUI objects should be constructed and manipulated <em>only</em> on the <a href="http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html" rel="nofollow noreferrer">event dispatch thread</a>.</p></li> </ul> <p><img src="https://i.stack.imgur.com/31eWW.png" alt="BottomBar"></p> <pre><code>import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.RenderingHints; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JPanel; /** @see https://stackoverflow.com/a/13610367/230513 */ public class Main { public static void main(String args[]) { EventQueue.invokeLater(new Runnable() { @Override public void run() { JFrame frame = new JFrame("BottomBar"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.add(new JPanel() { @Override public Dimension getPreferredSize() { return new Dimension(320, 240); } }, BorderLayout.CENTER); frame.add(new BottomBar(), BorderLayout.SOUTH); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } }); } private static class BottomBar extends JComponent { @Override public Dimension getPreferredSize() { return new Dimension(0, 30); } @Override protected void paintComponent(Graphics g) { Graphics2D g2 = (Graphics2D) g; g2.setRenderingHint( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); GradientPaint gradient = new GradientPaint( 0, 0, new Color(185, 185, 185), 0, getHeight(), new Color(151, 151, 151)); g2.setPaint(gradient); g2.fillRect(0, 0, getWidth(), getHeight()); g2.setColor(new Color(64, 64, 64)); g2.drawLine(0, 0, getWidth(), 0); g2.setColor(new Color(215, 215, 215)); g2.drawLine(0, 1, getWidth(), 1); } } } </code></pre>
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    1. COOkay, thanks for the help and the information about the event dispatch. Unfortunately it didnt solve the problem.
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    2. COIt has nothing to to with the bottom bar I realized. If I replace new BottomBar just with JButton the problem stays - a little bit of the button is cut off while resizing the frame upwards. Also, the problem occurs with 1.7. Not with 1.6. Would it be helpful if I post a screenshot?
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    3. COIt can't hurt. Each update to your question bumps it in the "active" queue. Also show the code you're testing. One goal is to see if anyone else running 1.7 can reproduce the problem.
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