Swing problem with styled text component and scroll pane

StyledTextWrapAndScroll.java

package scratch;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/**
 *
 * @author seanh
 */
public class StyledTextWrapAndScroll {

    StyledTextWrapAndScroll() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setPreferredSize(new Dimension(150,200));
        Container contentPane = frame.getContentPane();

        JTextPane tp = new JTextPane();
        tp.setContentType("text/html");
        tp.setText("<p>bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla</p>");

        /* This will wrap.
        JScrollPane scrollPane = new JScrollPane(tp);
        contentPane.add(scrollPane); */

        /* This will not wrap. */
        JPanel panel = new JPanel();
        panel.add(tp);
        JScrollPane scrollPane = new JScrollPane(panel);
        scrollPane.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        contentPane.add(scrollPane);

        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        new StyledTextWrapAndScroll();
    }
}