That will work, although there is another way that is a little simpler and
more flexible.

A JTextPane will *always* wrap text at its width, and it requests a width
equal to the width of its longest paragraph.  By placing it in a JPanel
using a FlowLayout or similar layout manager, you cause it to be sized to
that preferred width, which will prevent wrapping from occurring.

Since JTextPane implements the Scrollable interface, you can tell the
enclosing JScrollPane to size the JTextArea at its preferred width, as
opposed to the width of the viewport, by returning false from the
getScrollableTracksViewportWidth() method.

  JTextPane pane = new JTextPane() {
     public boolean getScrollableTracksViewportWidth() {
        return false;
     }
  };