utilizando el motor de SAXON Xpath en Java

Question

Aquí está mi código:

public static void main(String[] args) { 

    // System.setProperty(
    // "javax.xml.xpath.XPathFactory", 
    // "net.sf.saxon.xpath.XPathFactoryImpl"); 

    String xml="<root><a>#BBB#</a><a>#CCC#</a><b><a>#DDD#</a></b></root>"; 
    try{ 
     JDocument dom = new JDocument(xml); 

     XPathFactory factory = net.sf.saxon.xpath.XPathFactoryImpl.newInstance(); 
     XPath xpath = factory.newXPath(); 
     XPathExpression expr = xpath.compile("//a[matches(.,'#...#')]"); 

     Object result = expr.evaluate(dom, XPathConstants.NODESET); 
     NodeList nodes = (NodeList) result; 
     Nodes sharped = new Nodes(nodes); 

     for (Node n:sharped){ 
      System.out.println(n.toString()); 
     } 
    } 
    catch(Exception e){ 
     e.printStackTrace(); 
    } 

} 

Y conseguir esto:

javax.xml.transform.TransformerException: Impossible to find the function : matches 
at org.apache.xpath.compiler.XPathParser.error(XPathParser.java:608) 
at org.apache.xpath.compiler.XPathParser.FunctionCall(XPathParser.java:1505) 
at org.apache.xpath.compiler.XPathParser.PrimaryExpr(XPathParser.java:1444) 
at org.apache.xpath.compiler.XPathParser.FilterExpr(XPathParser.java:1343) 
at org.apache.xpath.compiler.XPathParser.PathExpr(XPathParser.java:1276) 

Lo que significa que Java está utilizando org.apache.xpath.compiler.XPathParser clase cuando claramente creado mi fábrica a través de net.sf.saxon.xpath.XPathFactoryImpl.

(en realidad solo necesito poner matches en mis xpaths ... entonces, si se conoce alguna solución que no involucre a Saxon, considere mi necesidad).

¿Qué estoy haciendo mal?

Answer 1

De ejemplos sajonas:

System.setProperty("javax.xml.xpath.XPathFactory:"+NamespaceConstant.OBJECT_MODEL_SAXON, "net.sf.saxon.xpath.XPathFactoryImpl"); 
XPathFactory xpf = XPathFactory.newInstance(NamespaceConstant.OBJECT_MODEL_SAXON); 

funciona bien.