XMLSec and WSS4J in WSAS 3.1.2

I have a web service deployed in WSAS 2.3 that validates an xml document Signature using the api: xmlsec-1.4.0.jar When I deployed my web service in WSAS 2.1, it gives me the following error : java.lang.NoSuchMethodError: org.apache.xml.security.utils.XMLUtils.createDSctx(Lorg/w3c/dom/Document;Ljava/lang/String;Ljava/lang/String;)Lorg/w3c/dom/Element; I included my jar in the lib/endorsed library of the WSAS. in the web service, the code is the following : org.w3c.dom.Element nscontext = XMLUtils.createDSctx(doc, "ds", Constants.SignatureSpecNS); doc is a org.w3c.dom.Document I then use the element with org.apache.xpath.XPathAPI.selectNodeList(doc, "//ds:Signature", nscontext); I found the class org.apache.xml.security.utils.XMLUtils in wss4j deployed as a plugin as oposed to wsas 2.3 where it was available as a library only... Any idea? My goal is to upgrade to wsas 3.x in order to use the BAM. Thanks Guillaume