In the sample JTree app given below, when i try to do CTL-CLICK to deselect a selected node, it throws a NPE. This happens on win2k and Winxp in JDK1.5 only.

In DefaultRenderer i return null for background and NonSelectionBackground color.


import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
public class JTreeTest {
public static void main(String[] args) throws Exception{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
//UIManager.put("Tree.drawDashedFocusIndicator",Boolean.FALSE);
        JFrame fr = new JFrame("JTreeTest");
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("root");
        DefaultTreeModel model = new DefaultTreeModel(root);
        DefaultMutableTreeNode ch1 = new DefaultMutableTreeNode("A",true);
        DefaultMutableTreeNode ch2 = new DefaultMutableTreeNode("B",true);
        root.add(ch1);
        root.add(ch2);
        ch1.add(new DefaultMutableTreeNode("1"));
        ch1.add(new DefaultMutableTreeNode("2"));
        ch1.add(new DefaultMutableTreeNode("3"));
        ch2.add(new DefaultMutableTreeNode("4"));
        JTree tr = new JTree(model);
        tr.setCellRenderer(new DefaultTreeCellRenderer() {
public Color getBackgroundNonSelectionColor(){
return null;
}
public Color getBackground(){
return null;
}

});
fr.getContentPane().add(tr);
fr.setSize(200,200);
       fr.setVisible(true);
       fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}
}
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