I'm just guessing, at this point, but...
createCopy() creates a copy of the Element (and children) and not attached
to a Document.
Any path that begins with "//" is an absolute path that must start
from a Document. Your copy has no Document, and thus, tells me
the Document is 'null', which is then somewhat difficult to work
with.
Probably the simple answer, when working with a sub-tree of Elements
that aren't attached to a Document is to avoid using xpaths that
expect a Document to be available. Try a relative XPath instead,
by prepending a dot.
.//list
-bob
On Sat, 16 Mar 2002, Poon, Leon wrote:
>
> I am trying to select a single node on a COPY of an element, but I am
> getting NullPointerException
> when I tried it. For example, I am getting the null pointer exception on
> node2 below. Is this a bug,
> or am I not using it properly? Right now, I am cloning the Document to get
> past this problem, but
> I think this is a very kludgy solution. Any suggestion is greatly welcome.
>
> ============================================================================
> ===================
> String str =
> "<wine><prices><list>13.99</list><discounted>11.00</discounted></prices></wi
> ne>";
> SAXReader reader = new SAXReader();
> Document doc = reader.read(new StringReader(str));
>
> Element element = doc.getRootElement();
> Element node = (Element) element.selectSingleNode("//list");
> System.out.println("node: "+node.asXML());
>
> try {
> Element elem2 = element.createCopy();
> Element node2 = (Element) elem2.selectSingleNode("//list");
> System.out.println("node2: "+node2.asXML());
> }
> catch (Exception e) {e.printStackTrace();}
>
> Document doc2 = doc.clone();
> Element elem3 = doc2.getRootElement();
> Element node3 = (Element) elem3.selectSingleNode("//list");
> System.out.println("node3: "+node3.asXML());
> ============================================================================
> ===================
>
> Leon
>
>
>
>
>
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> Thank you.
>
>
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