Open url with createTempFile fails

Question

I am deploying a Java application which needs to use a web browser-based application to draw some data and save the data as snapshots. It works fine on my localhost version, but in the deployment environment, it fails. The browser launches on the deployment server but the I think it cannot find my temporary file for the URL because it fails to receive the messages I am sending it. The code below does not throw any exceptions so that is my best guess.
If it's a path problem, how do I get the temp file to be seen by the browser and load the page properly?
try {
File shortcut = File.createTempFile("DisplayURLs", ".html");
shortcut.deleteOnExit();
shortcut = shortcut.getCanonicalFile();
PrintWriter out = new PrintWriter(new FileWriter(shortcut));
// ... html statements ...
out.println("location.href=\"" + urls[0] + "\";");
// ... more html statements ...
out.close();
Runtime.getRuntime().exec(new String[] {"/opt/sfw/bin/firefox", shortcut.toURL().toString()});
catch (Exception e) {
System.out.println(" browser failure "+e.getLocalizedMessage());
}

Answer 1

In Firefox, you can click file and Save Page As, then save the page as an HTML file. Under Tools>Options or Firefox>Preferences (Mac) you can go to the Applications tab and add HTML as a file type and select DW as the default app to open them.
Personally, I'd caution against that because it messes up things that you really should be using Firefox or IE to open. (CHMs or application help files for example).