Can't access a variable's children in extension element

[Peter Carberry]

Hi all,

I'm having an issue with evaluating an XPath expression in an extension
element. It works fine for almost all cases I've tried so far, but if I have
a variable in my stylesheet which has child nodes under it, I'm having
difficulty when I try to resolve any of the children more than once. So for
a variable $blahVar which resolves to this element:

<entry code="blah">
   <firstamount>12345</firstamount>
   <secondamount>67890</secondamount>
</entry>

... I can pass my element something like <tst:myElement
value="$blahVar/firstamount" /> and have it work on '12345', however after
accessing the variable for the first time any subsequent accesses fail. If I
put that same call in again, or substitute $blahVar/secondamount then the
XPath variable always resolves to the empty string.

This is obviously possible - I have xsl:value-of doing the exact same
lookups with the same XPath strings right alongside and getting the correct
results. I've been checking through the xalan-j source this morning to see
if I could see what I'm missing, but I'm still quite new to xalan-j and
nothing has jumped out at me so far.

The code I'm using is as follows:

    protected static String xpathLookup(XSLProcessorContext context,
ElemExtensionCall call, String exp) throws TransformerException
    {
        String nodeText = "";

        if ((exp != null && exp.length() != 0))
        {
            TransformerImpl transformer = context.getTransformer();
            XPathContext xpContext = transformer.getXPathContext();

            try
            {
                xpContext.pushNamespaceContext(call);
                int current = xpContext.getCurrentNode();
                xpContext.pushCurrentNodeAndExpression(current,current);

                XPath dynamicXPath = new XPath(
                    exp,
                    xpContext.getSAXLocator(),
                    xpContext.getNamespaceContext(),
                    XPath.SELECT,
                    transformer.getErrorListener());

                Expression expression = dynamicXPath.getExpression();

                XObject xobj1 = expression.execute(xpContext);
                xpContext.popCurrentNodeAndExpression();
                xpContext.popNamespaceContext();
                nodeText = xobj1.toString();
            }
            catch(TransformerException te) {}
        }

        return nodeText;
    }

I know this has to be something really simple that I'm missing, any help is
appreciated.

Thanks,
Peter Carberry.