SaxParser error when deploying J2EE application on 10gAS for IBM AIX 5.2

Question

Hello,
We have problems deploying J2EE application on 10gAS 9.0.4.0.0, on IBM AIX 5.2. We deployed it on 10gAS for Windows 9.4.0.0 and 9.0.4.0.1, and on 10gAS 9.0.4.0.0 for Linux, without any trouble (installed ADF runtime, etc.).
Application architecture is JSP/Struts/ADF BC4J. We used JHeadstart 10g framework.
As soon as we start the application, we get the message described bellow. We saw that J2SE version, shipped with the AS is 1.4.1? On all the other AS versions, and in embedded JDeveloper OC4J is 1.4.2.
We also use the Xerces library xercesImpl.jar, which is located in .../WEB-INF/lib directory (which contains SaxParser implementation), if that is important. But the application fails right on the beginning.
The complete error message follows:
javax.xml.parsers.FactoryConfigurationError: Provider null could not be
instantiated: java.lang.NullPointerException at
javax.xml.parsers.SAXParserFactory.newInstance(SAXParserFactory.java:30) at
org.apache.commons.digester.Digester.getFactory(Digester.java:512) at
org.apache.commons.digester.Digester.getParser(Digester.java:686) at
org.apache.commons.digester.Digester.getXMLReader(Digester.java:902) at
org.apache.commons.digester.Digester.parse(Digester.java:1567) at
org.apache.struts.action.ActionServlet.initServlet(ActionServlet.java:1433) at
org.apache.struts.action.ActionServlet.init(ActionServlet.java:466) at javax.servlet.GenericServlet.init(GenericServlet.java:258) at
oracle.jheadstart.controller.struts.JhsActionServlet.init(JhsActionServlet.java:219) at
com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.HttpApplication.loadServlet(HttpApplication.java:2094)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.HttpApplication.findServlet(HttpApplication.java:4523)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.HttpApplication.getRequestDispatcher(HttpApplication.java:2561)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:640)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:208)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:125)
at com.evermind[Oracle Application Server Containers for J2EE 10g
(9.0.4.0.0)].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
at java.lang.Thread.run(Thread.java:568)
Any information would be helpful,
Vladimir,
MAOP d.o.o., Slovenia

Answer 1

Figures, I've been fighting with this for the past day and a half and I figure it out shortly after I post the question.
It turns out the tiles.jar that was in our WEB-INF/lib directory was an old one. It looks like the newer struts.jar (from jdeveloper) we're using includes the tiles information. Once I removed tiles.jar, commons-dbcp, pool, resources, and services, it works now.
It looks like jdeveloper overwrites most of those files with it's built in struts integration, and we've just been lucky before that struts.jar was being loaded before tiles.jar and something with oas 10.1.3 is loading the jars in a different order--but I'm just guessing here.