OK, this doesn't seem possible.
I am returned a NodeList which, when explicitly tested to be null, is shown
to be not null. Yet as soon as I try to access it, I'm awarded a
NullPointerException.
Here's code that illustrates the problem:
Element root = doc.getDocumentElement();
// Start by getting the Element of interest
NodeList nodes = root.getElementsByTagName(elementName);
//System.out.println(nodes); // shows type is
DeepNodeListImpl
//added test to try to sidestep NullPointerException.
// Doesn't see condition as true
if (nodes == null) {
System.out.println("nodelist null");
return false;
}
//Hmmm. we passed the is null test, but getLength() will
fail
// with NullPointerException if this is uncommented
//System.out.println(nodes.getLength());
// this try-catch really shouldn't be necessary.
// but without it, we abort with NPE on the getLength() test
try {
if ((nodes == null) || (nodes.getLength() == 0)) {
System.out.println("didn't find specified
element");
return false; // always a failure
}
} catch (NullPointerException e) {
// We will see this message
System.out.println("This is stupid");
return false;
}
Any clue what's going on here? I have this problem occuring twice in my
code - once where I expect the returned list to be empty, but in another
case where I think the NodeList should contain one entry.
I'm using JAXP 1.2_01; I'm not sure how to map that to a Xerces version
number.
Mike Yawn
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