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FULL PRODUCT VERSION : java version " 1.7.0_09 " Java(TM) SE Runtime Environment (build 1.7.0_09-b05) Java HotSpot(TM) 64-Bit Server VM (build 23.5-b02, mixed mode) ADDITIONAL OS VERSION INFORMATION : Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64 x86_64 Mac OS X 10.8.2 A DESCRIPTION OF THE PROBLEM : The Swing JProgressBar on OS X does not animate. Neither the indeterminate progress bar, nor the determinate one show any animated sign of progress. REGRESSION. Last worked in version 6u31 REPRODUCIBILITY : This bug can be reproduced always. ---------- BEGIN SOURCE ---------- import javax.swing.*; public class ScratchSpace { public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { JFrame frame = new JFrame( " JProgressBar Test " ); JPanel panel = new JPanel(); final JProgressBar progressBar1 = new JProgressBar(); progressBar1.setIndeterminate(true); panel.add(progressBar1); final JProgressBar progressBar2 = new JProgressBar(0, 100); progressBar2.setValue(50); panel.add(progressBar2); frame.setContentPane(panel); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } } ---------- END SOURCE ----------