I am having trouble using SimpleAttributeSet in trying to extract urls from a page. The program goes to a specified web page and tries to grab all urls on the page. Relevent part of the code is given below.

			

			SimpleAttributeSet s = (SimpleAttributeSet) elem.getAttributes(). getAttribute(HTML.Tag.A);
			

			if (s != null) {
			

			String urlStr = s.getAttribute HTML.Attribute.HREF). toString();
			

		

For some root urls, the program works fine but for some, I get a null pointer exception at the last line in the above code.

Hoping for some advice. Thanx