http://monaco.sfbay.sun.com/detail.jsf?cr=6616742 moved nimbus from sun.swing.plaf.nimbus to com.sun.swing.plaf.nimbus. This works fine when pass -Dswing.defaultlaf=com.sun.swing.plaf.nimbus.NimbusLookAndFeel as arguments. When we try to change the lookAndFeel programmically then the changes will not effect. This is reproducable only on pit build i,e after the fix. This is a blocker for our test execution , where we change the lookandfeel programmically.

Step to reproduce:
---------------------
1) Run the below testcase.
2) Try to changing the look&feel from the menu. When you choose Nimbus , if you see the exception then the bug is reproduced.


---------- testcase ----------
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class NimbusLookAndFeelIsNotApplied implements java.awt.event.ItemListener {
JFrame frame = null;
JMenu lookAndFeelMenu = null;
JMenuBar menuBar = null;

NimbusLookAndFeelIsNotApplied(){
frame = new JFrame();
UIManager.LookAndFeelInfo[] laf = UIManager.getInstalledLookAndFeels();
JMenu lafMenu = new JMenu("Look And Feel");
lafMenu.setMnemonic('k');
ButtonGroup group = new ButtonGroup();
LookAndFeel defaultLAF = UIManager.getLookAndFeel();
for(int i=0; i<laf.length; i++) {
JRadioButtonMenuItem menuItem = new JRadioButtonMenuItem(laf[i].getName());
menuItem.setActionCommand(laf[i].getClassName());
menuItem.addItemListener(this);
if(laf[i].getName().equals(defaultLAF.getName())) {
menuItem.setSelected(true);
}
group.add(menuItem);
lafMenu.add(menuItem);
}
menuBar = new JMenuBar();
menuBar.add(lafMenu);
frame.setJMenuBar(menuBar);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300,300);
frame.setVisible(true);
}

public void itemStateChanged(java.awt.event.ItemEvent ie){
if(ie.getStateChange() == ItemEvent.SELECTED){
try {
JMenuItem menuItem = (JMenuItem) ie.getItem();
UIManager.setLookAndFeel(menuItem.getActionCommand());
Component parent = SwingUtilities.windowForComponent(this.frame);
if(parent == null) {
parent = this.frame;
}
SwingUtilities.updateComponentTreeUI(parent);
} catch (Exception e) {
System.err.println("Error: Cannot set this Look And Feel " + e);
}
}
}


public static void main(String []args){
javax.swing.SwingUtilities.invokeLater(new Runnable(){
public void run(){
new NimbusLookAndFeelIsNotApplied();
}
});
}
}
------------------------------
The correct new package for Nimbus is "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel" not "com.sun.swing..."