/*

 * Issue38479Workaround.java

 *

 * Created on August 26, 2004, 2:43 PM

 */

package org.netbeans.core;

import java.awt.BorderLayout;

import javax.swing.JFileChooser;

import javax.swing.JFrame;

import javax.swing.UIManager;

import javax.swing.plaf.FileChooserUI;

import javax.swing.plaf.metal.MetalFileChooserUI;

/**

 * Workaround for issue 34879 - sometimes the WinXP file chooser UI

 * tries to create image icons for the file chooser buttons before

 * it has loaded its images, calls new ImageIcon(null) and throws an

 * NPE.  A second call usually succeeds, but this is recently reported

 * to fail a second time, so we try it several times.

 * <p>

 * This class will "warm up" WindowsFileChooserUI, letting it fail a few

 * times if it needs to.

 *

 * @author  Tim Boudreau

 */

public class Issue38479Workaround extends JFileChooser {

    /** Creates a new instance of Issue38479Workaround */

    public Issue38479Workaround() {

    }

    public static void run() {

        System.err.println("Running workaround for issue 38479");

        JFrame jf = new JFrame();

        jf.getContentPane().setLayout(new BorderLayout());

        jf.getContentPane().add(new Issue38479Workaround());

        //Triggers updateUI()

        jf.pack();

        jf.dispose();

    }

     public void updateUI() {

        try {

            System.err.println("Forcing file chooser UI to pre-initialize");

            super.updateUI();

        } catch (NullPointerException npe) {

            for (int i=0; i < 5; i++) {

                System.err.println("Try number " + i);

                try {

                    npe = null;

                    try {

                        Thread.currentThread().sleep(50);

                    } catch (InterruptedException ie) {

                        break;

                    }

                    super.updateUI();

                    break;

                } catch (NullPointerException npe2) {

                    npe = npe2;

                }

            }

            if (npe != null) {

                System.err.println("Complete failure.  Defaulting all file choosers" +

                "to use MetalFileChooserUI");

                //Failover - have to do something

                UIManager.put("FileChooserUI", 

                    "javax.swing.plaf.metal.MetalFileChooserUI"); //NOI18N

                setUI ((FileChooserUI) MetalFileChooserUI.createUI(this));

            }

        }

    }    

}

import javax.swing.UIManager;

        if (System.getProperty("java.version").indexOf("1.4") != -1 //NOI18N

            && "Windows".equals(UIManager.getLookAndFeel().getID())) {//NOI18N

            Issue38479Workaround.run();

        }