Appletviewer core dumps while disposing modal dialogs on Solaris 2.6/Sparc machines, if LC_CTYPE is set to en_US.

I used a simple applet, which brings up a modal dialog on a button-click and
disposes the dialog on a button-click on the dialog. When environment variable
LC_CTYPE was set to en_US - the applet core dumps almost every time I try to
dispose the dialog. After unsetting LC_CTYPE, the applet did not core dump for
about 20 create/dispose dialog attempts. I did not continue the test after that.

Following is the code for test applet -

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class DialogTest extends Applet implements ActionListener {
    String text;
    String buttonLabel;
    Frame appletFrame;
    TestDialog dialog;

    public DialogTest() {
        text = "Click on the button to bring up a Dialog Box";
        buttonLabel = "Dialog...";
    }

    public void init() {
        this.setLayout(new BorderLayout());
        this.add("Center", new MyPanel(this, text, buttonLabel));
        if (appletFrame == null) {
            Component parent = this;
            while (true) {
                if (parent == null) {
                    System.exit(1);
                } else if (parent instanceof Frame) {
                    break;
                } else {
                    parent = parent.getParent();
                }
            }
            appletFrame = (Frame)parent;
        }
    }

    public static void main(String[] args) {
        Frame f = new Frame("Dialog Test");
        DialogTest d = new DialogTest();
        d.appletFrame = f;
        d.init();
        f.add(d);
        f.pack();
        f.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        dialog = new TestDialog(appletFrame);
        dialog.setVisible(true);
    }

    class TestDialog extends Dialog implements ActionListener {
        String text;
        String buttonLabel;

        public TestDialog(Frame f) {
            super(f, "Dialog", true);
            text = "Click on the button to bring down the Dialog Box";
            buttonLabel = "Close";
            this.add("Center", new MyPanel(this, text, buttonLabel));
            this.pack();
        }

        public void actionPerformed(ActionEvent e) {
            this.setVisible(false);
            this.dispose();
        }
    }

    class MyPanel extends Panel {
        Button btDialog;
        TextArea taMsg;

        public MyPanel(ActionListener action, String tMsg, String bMsg) {
            this.setLayout(new BorderLayout());
            Button b = new Button(bMsg);
            b.addActionListener(action);
            TextArea a = new TextArea();
            a.setEditable(false);
            a.append(tMsg);
            this.add("Center", a);
            this.add("South", b);
        }
    }
}