XMLBeans and SelectPath from XQueryXPath samples, does it work ?

Hi all,

I'm using xmlbeans-2.2.0 and saxonb8-6-1 and I'm trying to
run the
provided SelectPath example from  XQueryXPath samples 
(I'm interested mainly on XmlObject.selectPath usage).

>From the XQueryXPath class I've commented out all calls
to the ExecQuery
class and I've left only the below calls:

        // Execute the XPath samples.
        SelectPath xpathSample = new SelectPath();
        
        System.out.println("Running
SelectPath.updateWorkPhone n");
        boolean xpWorkPhoneSuccessful =
xpathSample.updateWorkPhone(xml);
        
        System.out.println("Running
SelectPath.collectNames n");
        boolean xpCollectNames =
xpathSample.collectNames(xml);

I put in the classpath the below jars:

 - jsr173_1.0_api.jar
 - saxon8.jar
 - schemas.jar
 - xbean.jar
 - xbean_xpath.jar

but when I run XQueryXPathTest the result is empty ... I
don't see the
part related to

            System.out.println("nXML as updated by
updateWorkPhone
method (each work n" +
                    "phone number has been changed to
the same number):
nn"
                    + empDoc.toString() + "n");

so I think that empDoc.selectPath fails on the given
pathExpression.

        String pathExpression =
"$this/xq:employees/xq:employee/xq:phone[location='work']";

A second question, why the '$this' part is needed ?
If I try to remove it, I got the error:

Running SelectPath.updateWorkPhone
java.lang.RuntimeException: net.sf.saxon.trans.DynamicError:
Finding
root of tree: the context item is undefined

If I run XQueryXPathTest with the original XQueryXPath class
(that is
with all the original calls to the ExecQuery class) the
error is:

Running ExecQuery.selectEmpsByStateCursor

java.lang.NullPointerException
        at
net.sf.saxon.query.StaticQueryContext.buildDocument(Ljavax/x
ml/transform
/Source;)Lnet/sf/saxon/om/DocumentInfo;(StaticQueryContext.j
ava:412)
        at
org.apache.xmlbeans.impl.xquery.saxon.XBeansXQuery.execQuery
(Ljava/lang/
Object;Ljava/util/Map;)Ljava/util/List;(XBeansXQuery.java:74
)
        at
org.apache.xmlbeans.impl.store.Query$SaxonQueryImpl$SaxonQue
ryEngine.cur
sorExecute()Lorg/apache/xmlbeans/XmlCursor;(Query.java:345)
        at
org.apache.xmlbeans.impl.store.Query$SaxonQueryImpl.cursorEx
ecute(Lorg/a
pache/xmlbeans/impl/store/Cur;Lorg/apache/xmlbeans/XmlOption
s;)Lorg/apac
he/xmlbeans/XmlCursor;(Query.java:243)
        at
org.apache.xmlbeans.impl.store.Query.cursorExecQuery(Lorg/ap
ache/xmlbean
s/impl/store/Cur;Ljava/lang/String;Lorg/apache/xmlbeans/XmlO
ptions;)Lorg
/apache/xmlbeans/XmlCursor;(Query.java:48)
        at
org.apache.xmlbeans.impl.store.Cursor._execQuery(Ljava/lang/
String;Lorg/
apache/xmlbeans/XmlOptions;)Lorg/apache/xmlbeans/XmlCursor;(
Cursor.java:
1336)
        at
org.apache.xmlbeans.impl.store.Cursor._execQuery(Ljava/lang/
String;)Lorg
/apache/xmlbeans/XmlCursor;(Cursor.java:1331)
        at
org.apache.xmlbeans.impl.store.Cursor.execQuery(Ljava/lang/S
tring;)Lorg/
apache/xmlbeans/XmlCursor;(Cursor.java:3839)
        at
org.apache.xmlbeans.samples.xquery.ExecQuery.updateWorkPhone
(Lorg/apache
/xmlbeans/XmlObject;)Z(ExecQuery.java:74)
        at
org.apache.xmlbeans.samples.xquery.XQueryXPath.executeQuerie
s([Ljava/lan
g/String;)Z(XQueryXPath.java:75)
        at
org.apache.xmlbeans.samples.xquery.XQueryXPathTest.main([Lja
va/lang/Stri
ng;)V(XQueryXPathTest.java:29)

Could you help me to understand where is the problem ?

Regards
Patrizio

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