Name: aaC67449 Date: 01/17/99


JTabbedPane.indexOfTab(Icon) throws unexpected NullPointerException,
when there is a null icon in the list.


javadoc states:
"public int indexOfTab(Icon icon)

     Returns the first tab index with a given icon.
     Returns -1 if no tab has this icon.
     Parameters:
          icon - the icon for the tab

public void addTab(String title,
                   Icon icon,
                   Component component)

     Adds a component represented by a title and/or icon,
     either of which can be null. Cover method for <--
     insertTab().
"
See example.
--------------- Example---------------------------
import javax.swing.*;
import java.awt.*;
public class Test {
    public static void main(String argv[]) {
        JTabbedPane c = new JTabbedPane();
        Icon icons[] = { null, new StubIcon() };
        for (int j = 0; j < icons.length; j++) {
            c.addTab("" + j, icons[j], new JLabel("" + j)); // Fill the set
        }
        if (c.indexOfTab(icons[1]) == 1) { // Try to find through the null
            System.out.println("Ok");
        } else {
            System.out.println("Failed ");
        }
    }
}
class StubIcon implements Icon {
    public void paintIcon(Component c, Graphics g, int x, int y) {}
    public int getIconWidth() {
        return 0;
    }
    public int getIconHeight() {
        return 0;
    }
}

----------------output------------------
Exception in thread "main" java.lang.NullPointerException
        at javax.swing.JTabbedPane.indexOfTab(JTabbedPane.java:950)
        at Test.main(Test.java:13)


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