Hi,
I have implemented a JAX-WS service using the Provider<SOAPMessage>
interface. I would like to extract elements from the SOAP request using
XPath. But when I execute the XPathExpression on the SOAPPart of the
message, I get this ugly NullPointerException. I assume that, since
SOAPPart implements a DOM Document, this should work.
Here is an extract of my code:
public SOAPMessage invoke(SOAPMessage message) {
XPathFactory factory = XPathFactory.newInstance();
XPath xpathBuilder = factory.newXPath();
XPathExpression xpath =
xpathBuilder.compile("//OnBehalfOf/UsernameToken/Username/text()");
Node node = (Node) xpath.evaluate(message.getSOAPPart(),
XPathConstants.NODE);
}
The exception:
Caused by: javax.xml.transform.TransformerException: Unknown error in
XPath.
at org.apache.xpath.XPath.execute(XPath.java:363)
at org.apache.xpath.XPath.execute(XPath.java:301)
at
org.apache.xpath.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:123)
at
org.apache.xpath.jaxp.XPathExpressionImpl.eval(XPathExpressionImpl.java:97)
at
org.apache.xpath.jaxp.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:178)
... 38 more
Caused by: java.lang.NullPointerException
at org.apache.xml.dtm.ref.dom2dtm.DOM2DTM.nextNode(DOM2DTM.java:387)
at
org.apache.xml.dtm.ref.DTMDefaultBase._nextsib(DTMDefaultBase.java:563)
at
org.apache.xml.dtm.ref.DTMDefaultBase.getNextSibling(DTMDefaultBase.java:1140)
at
org.apache.xml.dtm.ref.DTMDefaultBaseTraversers$ChildTraverser.next(DTMDefaultBaseTraversers.java:461)
at org.apache.xpath.axes.AxesWalker.getNextNode(AxesWalker.java:333)
at org.apache.xpath.axes.AxesWalker.nextNode(AxesWalker.java:361)
at
org.apache.xpath.axes.WalkingIterator.nextNode(WalkingIterator.java:192)
at org.apache.xpath.axes.NodeSequence.nextNode(NodeSequence.java:281)
at org.apache.xpath.axes.NodeSequence.runTo(NodeSequence.java:435)
at org.apache.xpath.axes.NodeSequence.setRoot(NodeSequence.java:218)
at
org.apache.xpath.axes.LocPathIterator.execute(LocPathIterator.java:210)
at org.apache.xpath.XPath.execute(XPath.java:335)
I use Axis2 1.6.1 and JBoss 5
Has anybody seen something like this? Am I doing something wrong?
Thanks,
Lior
--
AdNovum Informatik AG
Lior Wehrli, Senior Software Engineer
MSc Computer Science ETH
Roentgenstrasse 22, CH-8005 Zurich
mailto:lior.weh...@adnovum.ch
phone: +41 44 272 6111, fax: +41 44 272 6312
http://www.adnovum.ch
AdNovum Offices: Bern, Budapest, Singapore, Zurich (HQ)
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