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https://issues.apache.org/jira/browse/XMLBEANS-561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17526682#comment-17526682
]
Dimitrios Lagkouvardos commented on XMLBEANS-561:
-------------------------------------------------
Hi PJ,
Adding the namespace declaration to the xpath expression resolved the
XPathException. However, the query returns xml-fragment, which results in
ClassCastException:
{noformat}
java.lang.ClassCastException: org.apache.xmlbeans.impl.values.XmlAnyTypeImpl
cannot be cast to test.xb.EmployeeType{noformat}
*I've tried xb 5.0.0 and 5.0.3 with Saxon 10.6 and 10.8.*
I've used the employeeschema.xsd and employees.xml of
[https://xmlbeans.apache.org/samples/XQueryXPath.html] and put together 2
simple test cases using XmlObject.selectPath and XmlCursor.selectPath.
{noformat}
public static void xpathTest1(final File f) {
final String namespaceDeclaration =
"declare namespace
xq='http://xmlbeans.apache.org/samples/xquery/employees'; ";
String pathExpression = "$this/xq:employees/xq:employee";
XmlObject xmlObj = parse(f);
XmlObject[] results = xmlObj.selectPath(namespaceDeclaration +
pathExpression);
if (results.length > 0) {
for (XmlObject o : results) {
System.out.println(XMLHelper.getXmlBeanAsString(o, null));
EmployeeType e = (EmployeeType) o; // java.lang.ClassCastException
}
}
}
public static void xpathTest2(final File f) {
final String namespaceDeclaration =
"declare namespace
xq='http://xmlbeans.apache.org/samples/xquery/employees'; ";
String pathExpression = "$this/xq:employees/xq:employee";
XmlObject xmlObj = parse(f);
XmlCursor cursor = xmlObj.newCursor();
cursor.selectPath(namespaceDeclaration + pathExpression);
while (cursor.toNextSelection()) {
System.out.println(XMLHelper.getXmlBeanAsString(cursor.getObject(),
null));
EmployeeType e = (EmployeeType) cursor.getObject(); //
java.lang.ClassCastException
}
}{noformat}
This is the returned fragment:
{noformat}
<xml-fragment xmlns:emp="http://xmlbeans.apache.org/samples/xquery/employees";>
<emp:name>Fred Jones</emp:name>
<emp:address location="home">
<emp:street>900 Aurora Ave.</emp:street>
<emp:city>Seattle</emp:city>
<emp:state>WA</emp:state>
<emp:zip>98115</emp:zip>
</emp:address>
<emp:address location="work">
<emp:street>2011 152nd Avenue NE</emp:street>
<emp:city>Redmond</emp:city>
<emp:state>WA</emp:state>
<emp:zip>98052</emp:zip>
</emp:address>
<emp:phone location="work">(425)555-5665</emp:phone>
<emp:phone location="home">(206)555-5555</emp:phone>
<emp:phone location="mobile">(206)555-4321</emp:phone>
</xml-fragment>{noformat}
Thank you.
> XPath support for namespace prefix to URI mappings
> --------------------------------------------------
>
> Key: XMLBEANS-561
> URL: https://issues.apache.org/jira/browse/XMLBEANS-561
> Project: XMLBeans
> Issue Type: Improvement
> Components: XPath
> Affects Versions: Version 5.0.0
> Reporter: Dimitrios Lagkouvardos
> Priority: Major
>
> 5.0.0 supports Saxon and an XmlBeans xpath engine. I don't see a way to
> configure or supply at runtime namespace prefix to URI mappings.
> *Suggestions*:
> 1) One solution is to enhance XmlObject.selectPath(String,XmlOptions) to use
> the namespaces returned by XmlOptions.getLoadAdditionalNamespaces (or perhaps
> add a new method if this is deemed inappropriate).
> 2) An alternative is to add an extension to retrieve the mappings to be
> passed to the xpath engine (instead of passing it on each call to selectPath).
> *Note*: Adding the namespace declaration to the xpath expression as
> documented in [http://xmlbeans.apache.org/guide/XPathXQuery.html] does NOT
> work:
> ```
> java.lang.RuntimeException: net.sf.saxon.trans.XPathException: Namespace
> prefix 'table' has not been declared
> at
> org.apache.xmlbeans.impl.xpath.saxon.SaxonXPath.selectNodes(SaxonXPath.java:128)
> at
> org.apache.xmlbeans.impl.xpath.saxon.SaxonXPath.selectPath(SaxonXPath.java:133)
> at
> org.apache.xmlbeans.impl.xpath.saxon.SaxonXPathEngine.next(SaxonXPathEngine.java:60)
> at org.apache.xmlbeans.impl.store.Cursor._toSelection(Cursor.java:749)
> at org.apache.xmlbeans.impl.store.Cursor._toNextSelection(Cursor.java:736)
> at org.apache.xmlbeans.impl.store.Cursor._hasNextSelection(Cursor.java:728)
> at org.apache.xmlbeans.impl.store.Cursor.syncWrapHelper(Cursor.java:2520)
> at org.apache.xmlbeans.impl.store.Cursor.syncWrap(Cursor.java:2451)
> at org.apache.xmlbeans.impl.store.Cursor.hasNextSelection(Cursor.java:2022)
> at
> org.apache.xmlbeans.impl.values.XmlObjectBase.selectPath(XmlObjectBase.java:496)
> ```
>
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