ClassCastException - want using JXPATH

Question

Hi there,
i've libraries i want to use which are using jxpath; the default oracle xml parser doesn't recognize the
InputStream is =
ServiceLocator.instance().getResourceLoader().getResourceAsStream(
configFile);
Reader reader = new InputStreamReader(is);
Document doc = DOMHelpers.instance().newDocument(reader);
Node root = doc.getFirstChild();
--> For unknown reasons i get NULL! for following:
final String jcdAlias =
DOMHelpers.instance().selectSingleValue(
root, "param[@name='jcdAlias']/@value");
--> DOMHelpers:
public Node selectSingleNode(Node aNode, String aXPathExpression) {
Object obj = this.selectSingleObject(aNode, aXPathExpression);
if ((obj != null) && !(obj instanceof Node)) {
LOGGER.warn(
MessageFormat.format(
"Keine Node Instanz {0}, {1}",
new Object[] {obj.getClass(), obj}));
return null;
return (Node)obj;
public String selectSingleValue(Node aNode, String aXPathExpression) {
Object val = this.selectSingleObject(aNode, aXPathExpression);
if (val == null) {
return null;
return extractText(val);
In TOMCAT 5.0x this works fine with JXPATH.
I've configurated the orion-web.xml with following values:
<classpath
path="../../../applications/isgsn/my_Server/WEB-INF/classes"
/>
<classpath
path="../../../applications/isgsn/my_Server/WEB-INF/lib"
/>
in /classes i've the commons-jxpath.jar...
or
<web-app-class-loader search-local-classes-first="true" />
both results in:
Caused by: java.lang.ClassCastException
at javax.xml.parsers.DocumentBuilderFactory.newInstance(Unknown Source)
at de.x.helpers.DOMHelpers.<init>(Unknown Source)
-->
* standard constructor (private; Singleton)
private DOMHelpers() {
documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilderFactory.setNamespaceAware(true);
documentBuilderFactory.setValidating(false);
does anyone has suggestions? i'm very tired searching for classpath settings :(
thanks.

Answer 1

thanx mate for the reply,
i am sure that i am storing the same object in the vector.
first of all I tried the same code by writing small class same as yours & it worked fine so i implemented in my real implementation class. But it still gives me classCastException i am not able to understand it why???? Actually my Product class is a stateless session bean(hope u know EJB)
so actually i am storing a remote reference i.e(product)in my vector.But i dont think this should be a problem...
please help....
regards,
ashish