FULL PRODUCT VERSION :
java version "1.7.0_40"
Java(TM) SE Runtime Environment (build 1.7.0_40-b43)
Java HotSpot(TM) 64-Bit Server VM (build 24.0-b56, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.2.9200]

A DESCRIPTION OF THE PROBLEM :
Timer invoke same time, too invoke timing luggy ActionListener#actionPerformed

Please run below code and compare u25 between u40

REGRESSION. Last worked in version 7u25


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class TimerProblem extends JComponent {

int red = 0;

TimerProblem(final long startMs) {
setPreferredSize(new Dimension(10, 10));

Timer t = new Timer(16, new ActionListener() {

@Override
public void actionPerformed(ActionEvent e) {
red = (int)(System.currentTimeMillis() - startMs) % 255;
repaint();
}

});
t.setInitialDelay(1000);
t.start();
}

@Override
protected void paintComponent(Graphics g) {
g.setColor(new Color(red, 255 - red, 0));
g.fillRect(0, 0, getWidth(), getHeight());
}

public static void main(String[] args) {
JFrame f = new JFrame();
Container c = f.getContentPane();

c.setLayout(new GridLayout(10, 10));
long startMs = System.currentTimeMillis();
for (int i = 0; i < 100; i++) {
c.add(new TimerProblem(startMs));
}
f.pack();
f.setVisible(true);
}

}

---------- END SOURCE ----------

SUPPORT :
YES