FULL PRODUCT VERSION :
1.7.0_07

ADDITIONAL OS VERSION INFORMATION :
Mac OSX Lion

A DESCRIPTION OF THE PROBLEM :
UIManager.getSystemLookAndFeelClassName();
jDesktopPane1.setDesktopManager(new DefaultDesktopManager() );

Above runs, but when a JInternalFrame is minimized, RepaintManager reports a null pointer exception in line 965.

This works on Windows, and on Apple Java 6.



REGRESSION. Last worked in version 6u31

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
working JWS example of source code below:

http://www.whatifsquared.com/desktopmgrexample.jnlp


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package desktopMgrExample;
import java.awt.*;
import javax.swing.*;

public final class DesktopMgrExample extends JFrame {
 
    public DesktopMgrExample() {
        try{ UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch(Exception ex){}
        initComponents();
        
        jDesktopPane1.setDesktopManager(new DefaultDesktopManager() );
        
        final JInternalFrame myIFrame = new JInternalFrame( " Title " , true, true, true, true);
        myIFrame.setSize(300, 300);
        myIFrame.setLocation(20,20);

        jDesktopPane1.add(myIFrame, JLayeredPane.PALETTE_LAYER);
        myIFrame.setVisible(true);
    
    }
    // <editor-fold defaultstate= " collapsed " desc= " Generated Code " >
    private void initComponents() {

        jDesktopPane1 = new javax.swing.JDesktopPane();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setPreferredSize(new java.awt.Dimension(500, 500));
        getContentPane().add(jDesktopPane1, java.awt.BorderLayout.CENTER);

        pack();
    }// </editor-fold>
    //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    public static void main(final String args[]) throws AWTException {
        
        java.awt.EventQueue.invokeLater(new Runnable() {
            
            @Override
            public void run() {
                new DesktopMgrExample().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JDesktopPane jDesktopPane1;
    // End of variables declaration

}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Detect Java 7 on OSX, still with default manager