NullPointer Exception - getAttribute

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VitaminB - 26 Apr 2006 08:43 GMT

Hello,

I want to parse a HTML document to get all URLs of the frames in a
frameset. I get a "NullPointer Exception" in String s =
(String)attSet.getAttribute(HTML.Attribute.SRC);

Thanks a lot for you help.
Regards, Marcus

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Exception
##################
http://dev0004/Test/HET/PerformanceTestDB.nsf/Main?OpenFrameset
java.lang.NullPointerException
at Stress.urlRequest(Stress.java:82)
at Stress.run(Stress.java:40)

##################
Java Code:
##################

URL urlobj = new URL(str);

HttpURLConnection uc = null;
uc = (HttpURLConnection)urlobj.openConnection();
uc.setUseCaches(false);
DataInputStream is = new DataInputStream(uc.getInputStream());

HTMLEditorKit hKit = new HTMLEditorKit();
HTMLDocument hDoc = new HTMLDocument();
hKit.read(is, hDoc, 0);
HTMLDocument.Iterator it = hDoc.getIterator(HTML.Tag.FRAME);

AttributeSet attSet = it.getAttributes();
String s = (String)attSet.getAttribute(HTML.Attribute.SRC);
System.out.println(s);

##################
Beispiel HTML-Seite:
##################

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN">
<html>
<head>

<script language="JavaScript" type="text/javascript">

</script>
</head>

<frameset cols="45%,55%">

<frame
src="/Test/HET/PerformanceTestDB.nsf/ContentDeliveryMeasurement?OpenForm">

<frameset rows="1*,1*">

<frame src="/Test/HET/PerformanceTestDB.nsf/DocsInserted?OpenView">

<frame name="docPreviewFrame"
src="/Test/HET/PerformanceTestDB.nsf/select?OpenForm">
</frameset>
</frameset>
</html>

Reply to this Message

Oliver Wong - 26 Apr 2006 20:17 GMT

> I want to parse a HTML document to get all URLs of the frames in a
> frameset. I get a "NullPointer Exception" in String s =
> (String)attSet.getAttribute(HTML.Attribute.SRC);

Did you check that attSet is not null?

- Oliver

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NullPointer Exception - getAttribute

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