How open specified URL from Java code (fragment of Netbeans plugin code)

URLDisplayerDemo.java

    // ...
    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO implement action body
        try {
            URLDisplayer.getDefault().showURL(new URL("http://productivityblog.com.ua"));
        } catch (MalformedURLException ex) {
            JOptionPane.showMessageDialog(null, "Can't open an URL: " + ex.getMessage());
        }

    }
    // ...