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  1. Red Hat Fuse
  2. ENTESB-12210

XPath evaluation fails with null body using Saxon-HE-9.8.0-8_1

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      After upgrading to Fuse 7.4, the xpath expressions that operate on header when the exchange body is null are failing with nullpointer exception. This seems to be related to a change that was made in Saxon-HE 9.6 and later

      i have checked both saxon version Saxon-HE-9.5.1-3 and Saxon-HE-9.8.0-8_1

      Saxon-HE-9.5.1-3:

      /*@Nullable*/ public Object evaluate(/*@Nullable*/ Object node, /*@NotNull*/ QName qName) throws XPathExpressionException {
        NodeInfo contextNode = this.contextNode;
        if (node != null) {
            if (node instanceof SingletonItem) {
                node = ((SingletonItem)node).asItem();
            }
            if (node instanceof NodeInfo) {
                if (!((NodeInfo)node).getConfiguration().isCompatible(config)) {
                    throw new XPathExpressionException(
                                "Supplied node must be built using the same or a compatible Configuration");
                }

      Saxon-HE-9.8.0-8_1 :

      /*@Nullable*/
    public Object evaluate(/*@Nullable*/ Object node, /*@NotNull*/ QName qName) throws XPathExpressionException {
        Item contextItem;
        if (node instanceof ZeroOrOne) {
            node = ((ZeroOrOne) node).head();
        }
        if (node instanceof TreeInfo) {
            node = ((TreeInfo)node).getRootNode();
        }
        if (node instanceof DocumentInfo) {
            node = ((DocumentInfo)node).getUnderlyingNode();
        }
        if (node instanceof NodeInfo) {
            if (!((NodeInfo) node).getConfiguration().isCompatible(config))

      Null check on node is removed ' if (node != null) {' removed in latest versions, because of this change throwing NPE if body is Null

      StackTrace:

      java.lang.NullPointerException
at net.sf.saxon.xpath.XPathExpressionImpl.evaluate(XPathExpressionImpl.java:172)
at org.apache.camel.builder.xml.XPathBuilder.doInEvaluateAs(XPathBuilder.java:977)
at org.apache.camel.builder.xml.XPathBuilder.evaluateAs(XPathBuilder.java:850)
at org.apache.camel.builder.xml.XPathBuilder.matches(XPathBuilder.java:172)

        1. xpath-test.xml
          1 kB
          kodandaRamu kakarla

            ldemasi Luigi De Masi
            rhn-support-kkakarla kodandaRamu kakarla
            Francesco Mongiardo Francesco Mongiardo
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              Created:
              Updated:
              Resolved: