Display html file using SystemBrowser class

I'm trying to display an html file using the SystemBrowser class below.
I get the following error:
Could not invoke browser, command=netscape -remote openURL(file:/Users/joeUser/Documents/myFile.htm)
Caught: java.io.IOException: Cannot run program "netscape": error=2, No such file or directory
The file is definitely there.

This is in OS X.

Any suggestions?

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import Constants;

/**
 * Class to display html file in the system browser
 */
public class SystemBrowser implements Constants {

	// Used to identify the windows platform.
	private static final String WIN_ID = "Windows";

	// The default system browser under windows.
	private static final String WIN_PATH = "rundll32";

	// The flag to display a url.
	private static final String WIN_FLAG = "url.dll,FileProtocolHandler";

	// The default browser under unix.
	private static final String UNIX_PATH = "netscape";

	// The flag to display a url.
	private static final String UNIX_FLAG = "-remote openURL";

	/**
	 * Display a file in the system browser.
	 * If you want to display a file, you must include the absolute path name.
	 *
	 * @param url the file's url (the url must start with either "http://" or "file://").
	 */
	public static void displayURL(URL url) {
		logger.info("SystemBrowser.displayURL() = " +	url);
		final boolean isWindows = isWindowsPlatform();
		String commandString = null;
		try {
			if (isWindows) {
				// commandString = 'rundll32 url.dll,FileProtocolHandler http://...'
				commandString = WIN_PATH + " " + WIN_FLAG + " " + url;
				logger.info(commandString);
				final Process p = Runtime.getRuntime().exec(commandString);
			}
			else { // not windows
				// Under Unix, Netscape has to be running for the "-remote" command to work.
				// So try sending the command and check for an exit value.
				// If the exit command is 0, it was successful otherwise we need to start the browser.
				// cmd = 'netscape -remote openURL(http://www.javaworld.com)'
				commandString = UNIX_PATH + " " + UNIX_FLAG + "(" + url + ")";
				Process process = Runtime.getRuntime().exec(commandString);
				try {
					// wait for exit code -- if it's 0, command worked,
					// otherwise we need to start the browser up.
					final int exitCode = process.waitFor();
					if (exitCode != 0) {
						// Command failed, start up the browser
						// cmd = 'netscape http://www.javaworld.com'
						commandString = UNIX_PATH + " "  + url;
						process = Runtime.getRuntime().exec(commandString);
					}
				}
				catch(final InterruptedException x)	{
					System.err.println("Error bringing up browser, cmd='" +	commandString + "'");
					System.err.println("Caught: " + x);
					logger.info("Error bringing up browser, cmd='" +	commandString + "'");
					logger.info("Caught: " + x);
				}
			}
		}
		catch(final IOException x)	{
			logger.info("Could not invoke browser, command=" + commandString);
			logger.info("Caught: " + x);

			// couldn't exec browser
			System.err.println("Could not invoke browser, command=" + commandString);
			System.err.println("Caught: " + x);
		}
	}

	/**
	 * see if running Windows
	 *
	 * @return true if this application is running under a Windows OS
	 */
	public static boolean isWindowsPlatform() {
		final String osName = System.getProperty("os.name");
		if ( osName != null && osName.startsWith(WIN_ID)) {
			return true;
		}
		else {
			return false;
		}
	}

	/**
	 * main
	 */
	public static void main(String[] args)	{
		try {
			displayURL(new URL("http://epswww.unm.edu/facstaff/dolomite/"));
		} catch (final MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

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