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Problems switching from Xalan to Saxon


We have been using xalan to develop our application and have come to a point 
where our xml document is getting too big to handle with xalan.
We are trying to switch over to saxon because of the performance advantages 
it has with larger documents.
I have followed all the instructions but can not get our xml to translate 
using saxon...
We receive the following error...
Any help would be much appreciated.

java.lang.NullPointerException
at com.icl.saxon.DOMDriver.walkNode(DOMDriver.java:289)
at com.icl.saxon.DOMDriver.walkNode(DOMDriver.java:263)
at com.icl.saxon.DOMDriver.walkNode(DOMDriver.java:263)
at com.icl.saxon.DOMDriver.walkNode(DOMDriver.java:263)
at com.icl.saxon.DOMDriver.walkNode(DOMDriver.java:263)
at com.icl.saxon.DOMDriver.walkNode(DOMDriver.java:263)
at com.icl.saxon.DOMDriver.walkNode(DOMDriver.java:263)
at com.icl.saxon.DOMDriver.parse(DOMDriver.java:174)
at com.icl.saxon.DOMDriver.parse(DOMDriver.java:145)
at com.icl.saxon.om.Builder.build(Builder.java:258)
at com.icl.saxon.Controller.transform(Controller.java:905)
at com.xelus.planweb.pres.TransformXML.transform(TransformXML.java:179)
at com.xelus.planweb.pres.TransformXML.transform(TransformXML.java:167)
at com.xelus.planweb.request.RequestHandler.process RequestHandler.java:243)
at com.xelus.planweb.servlet.PlanServlet.doGet(PlanServlet.java:61)
at com.xelus.planweb.servlet.PlanServlet.doPost(PlanServlet.java:74)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:772)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:120)
at
weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:915)
at
weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:879)
at
weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextManager.java:269)
at
weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:365)
at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:253)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:129)

at com.xelus.planweb.pres.TransformXML.transform(TransformXML.java:188)
at com.xelus.planweb.pres.TransformXML.transform(TransformXML.java:167)
at
com.xelus.planweb.request.RequestHandler.process(RequestHandler.java:243)
at com.xelus.planweb.servlet.PlanServlet.doGet(PlanServlet.java:61)
at com.xelus.planweb.servlet.PlanServlet.doPost(PlanServlet.java:74)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:772)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:120)
at
weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:915)
at
weblogic.servlet.internal.ServletContextImpl.invokeServlet(ServletContextImpl.java:879)
at
weblogic.servlet.internal.ServletContextManager.invokeServlet(ServletContextManager.java:269)
at
weblogic.socket.MuxableSocketHTTP.invokeServlet(MuxableSocketHTTP.java:365)
at weblogic.socket.MuxableSocketHTTP.execute(MuxableSocketHTTP.java:253)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:129)

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