I suggest you specify this URL in your code as the following snippet:
CalendarService myService = new CalendarService("CalendarService");
myService.setUserCredentials("example@gmail.com", "yourPassword");
URL feedUrl = new URL("http://www.google.com/calendar/feeds/default/allcalendars/full");
CalendarFeed resultFeed = myService.getFeed(feedUrl, CalendarFeed.class);
System.out.println("Your calendars:");
for (int i = 0; i < resultFeed.getEntries().size(); i++) {
CalendarEntry entry = resultFeed.getEntries().get(i);
System.out.println("\t" + entry.getTitle().getPlainText());
}
CalendarEntry instances will store all calendars (primary, secondary, imported calendars) received at the specified URL.