yes. that is the reason. Thanks Andreas. Amila
On Thu, Dec 22, 2011 at 6:28 PM, Andreas Veithen <[email protected]>wrote: > 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] > > -- Amila Suriarachchi WSO2 Inc. blog: http://amilachinthaka.blogspot.com/
