AbstractMethodError when using XPathAPI.selectNodeList

hi,

I'm having a problem while  using  Xalan-j_2_1_0 API calls viz.

org.w3c.dom.NodeList nl =
    org.apache.xpath.XPathAPI.selectNodeList(domObj, "/abc/def");

& when i make the above call i keep getting

java.lang.AbstractMethodError:
org/apache/xerces/dom/NodeImpl.isSupported

Has anybody run into this before & is there a work around ?

tia,
dennis


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