Method: javax.swing.text.NavigationFilter.getNextVisualPositionFrom(..) doesn't throw declared BadLocationException when unexisting location is passed in.

Specification for BadLocationException states:
"This exception is to report bad locations within a document model (that is, attempts to reference a location that doesn't exist)."

The following code snippet expects BadLocationException for all valid SwingConstants, but it's not always being thrown.

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import javax.swing.*;
import javax.swing.text.NavigationFilter;
import javax.swing.text.Position;
import javax.swing.text.BadLocationException;

public class NF0006Snippet {

    public static void main(String[] args) throws BadLocationException, InterruptedException {

        JFormattedTextField jtf = new JFormattedTextField();
        NavigationFilter nf = new NavigationFilter();
        jtf.setText("A text message");

        JFrame jFrame = new JFrame();
        jFrame.getContentPane().add(jtf);
        jFrame.pack();
        jFrame.setVisible(true);

        Position.Bias[] biasRet = {Position.Bias.Forward};
        
        for (int swingConstant : new int[]{
                SwingConstants.EAST,
                SwingConstants.WEST,
                // the following constants still will lead to "BadLocationException: Length must be positive"
                // SwingConstants.SOUTH,
                // SwingConstants.NORTH,
                }) {
            for (int position : new int[] {-100, Integer.MIN_VALUE} ) {
                nf.getNextVisualPositionFrom(jtf, position, Position.Bias.Backward, swingConstant, biasRet);
                nf.getNextVisualPositionFrom(jtf, position, Position.Bias.Forward, swingConstant, biasRet);
            }
        }
        jFrame.dispose();
    }
}

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JCK-runtime-7 b03
JDK 7 b30
Platform: Windows, Solaris

The following JCK test fails due to this problem:

api/javax_swing/text/NavigationFilter/index.html#Methods[NavigationFilter0006]

http://moonblade.russia.sun.com/set/java/jck/qa-results/jck/7/ea/b03/results/qac/m002_b30_failed_c1/solaris-amd64-080723150835/execdata/jtwork/report/filtered/newFailedTestCases.html