Name: aaC67449 Date: 01/14/2000


The method JTree.AccessibleJTree.isAccessibleChildSelected() throws unexpected
 NPE, when there is no selected child nodes in the JTree.


See example.
------------------------- example ----------------
import javax.swing.*;
import javax.swing.tree.*;
import javax.accessibility.*;

public class Test {

    public static void main(String argv[]) {
        JTree o = createTree();
        AccessibleSelection c =
                o.getAccessibleContext().getAccessibleSelection();
        o.expandRow(0);
        //o.addSelectionRow(1); <-- add this line to cover up the problem

        c.isAccessibleChildSelected(0);
        System.out.println("Okey");
 
   }

    public static JTree createTree() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode(new Integer(0),
                true);
        JTree tree = new JTree(root);
        tree.setRowHeight(20);

        for (int i = 1; i < 10; i++) {
            root.add(new DefaultMutableTreeNode(new Integer(i)));
        }
        return tree;
    }

}

------------------------- output ----------------
Exception in thread "main" java.lang.NullPointerException
        at javax.swing.JTree$AccessibleJTree.isAccessibleChildSelected(JTree.java:3521)
        at Test.main(Test.java:14)

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