On Thu, Dec 22, 2011 at 13:36, Amila Suriarachchi <[email protected]> wrote: > hi, > > I am getting some null pointer exceptions for some xpath queries executed on > Axiom objects. Here is a sample code to reproduce the issue. > > OMFactory omFactory = OMAbstractFactory.getOMFactory(); > OMElement wrapperElement = omFactory.createOMElement(new > QName("http://test.com";, "wrapper")); > > PlaceOrder placeOrder = new PlaceOrder(); > placeOrder.setPrice(23.45); > placeOrder.setQuantity(23); > placeOrder.setSymbol("IBM"); > QName elementQName = new QName("http://test.com";, "placeOrder"); > > XMLStreamReader xmlStreamReader = > BeanUtil.getPullParser(placeOrder, elementQName, null, true, > false); > StAXOMBuilder stAXOMBuilder = new StAXOMBuilder(new > StreamWrapper(xmlStreamReader)); > > OMElement omElement = stAXOMBuilder.getDocumentElement(); > wrapperElement.addChild(omElement); > > try { > AXIOMXPath axiomxPath = new > AXIOMXPath("//sn:wrapper/sn:placeOrder"); > axiomxPath.addNamespace("sn", "http://test.com";); > > OMElement resultOMElement = (OMElement) > axiomxPath.selectSingleNode(wrapperElement); > > System.out.println("OMElement ==> " + resultOMElement); > } catch (JaxenException e) { > e.printStackTrace(); > } > > Here the result is null. Even I build the wrapperElement before executing > the xpath it won't work. > > But if I insert the following lines before xpath execution it works fine. > > String resultString = wrapperElement.toString(); > StAXOMBuilder resultOMBuilder = new StAXOMBuilder(new > ByteArrayInputStream(resultString.getBytes())); > wrapperElement = resultOMBuilder.getDocumentElement(); > > This means xpath and other things should be ok. And also this works fine for > the xpaths like > > //sn:placeOrder/sn:price > > what could be the reason?
The fact that in the first case the root of the Axiom tree is an OMElement, while in the second it is an OMDocument? > thanks, > Amila. > > -- > Amila Suriarachchi > WSO2 Inc. > blog: http://amilachinthaka.blogspot.com/ --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
