[Exist-open] NPE when performing a nested query on an XMLResource result

[Marc T. <ti...@th...>]

Hello,

I am trying to perform a "nested" XPath query on an XMLResource result
returned from an initial query.  It seems to work fine if my return
value does not include any "synthetic" XML, but once I introduce some
wrapper XML, I am getting a NullPointerException.  Here is a piece of
sample code that reproduces the problem using the Mondial data set:

---------------------------

public static void main(String args[]) throws Exception {
        Class cl =3D Class.forName("org.exist.xmldb.DatabaseImpl");

        Database database =3D (Database)cl.newInstance();
        DatabaseManager.registerDatabase(database);
       =20
        Collection col =3D=20
            DatabaseManager.getCollection(
                "xmldb:exist://localhost:8080/exist/xmlrpc/db"
            );
        XPathQueryServiceImpl  service =3D
            (XPathQueryServiceImpl) col.getService("XPathQueryService",
"1.0");
               =20
        ResourceSet result =3D service.query("for $city in
/mondial//city[name&=3D'tre*'] return <result>{$city}</result>");
       =20
        ResourceIterator i =3D result.getIterator();
        while(i.hasMoreResources()) {           =20
            XMLResource r =3D(XMLResource) i.nextResource();
           =20
            //This next line throws a NullPointerException!
            ResourceSet result2 =3D service.query(r,"result/city");

           =20
            System.out.println(result2.getSize());
           =20
            System.out.println(r.getContent());
        }
    }=20
--------------------------------

Note, if I take out the <result></result> and change the nested query to
"city", it works like a charm.

Also, if this is a newbie question, if I have missed something totally
obvious, or there is a much better way to do this, please accept my
apologies in advance...

Any help would be greatly appreciated,

Marc Tinkler


____________________________________________=20
TH!NKMAP=20

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