Mysterious (for me) ClassCastException

Hi everybody.
I've built a little internet site using servlets and Tomact 5.X
To do that, I've used XSLT transformations witrh Xalan 2.6.2 under JDK 1.5.
When I perform my XSLT transformation by a natural Java application, everything works.
But when I try to perform the transformation with a servlet under Tomcat 5, a strange ClassCastException occurs.
Here is its stack trace:
java.lang.ClassCastException: org.apache.xml.dtm.ref.DTMManagerDefault
     org.apache.xml.dtm.DTMManager.newInstance(DTMManager.java:135)
     org.apache.xpath.XPathContext.<init>(XPathContext.java:87)
     org.apache.xalan.transformer.TransformerImpl.<init>(TransformerImpl.java:370)
     org.apache.xalan.templates.StylesheetRoot.newTransformer(StylesheetRoot.java:159)
     org.apache.xalan.processor.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:674)
     general.xml.TransformateurXSLT.transformer(TransformateurXSLT.java:127)
     general.servlets.TransformationXMLParXSLT.doGet(TransformationXMLParXSLT.java:48)
     frontOffice.servlets.ServletSommaire.doGet(ServletSommaire.java:39)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:419)
     org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:133)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:856)The 135th line of DTMManager is the following:
      factoryImpl = (DTMManager) ObjectFactory .createObject(defaultPropName, defaultClassName);Knowing that DTMManagerDefault extends DTMManager, what could be the problem ?
Can it be a problem of ClassLoader ?
Any help will be appreciated.
Thank's in advance.

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