Java - Error initializing servlet

Hola tengo una aplicación web realizada con strust, que en el servidor oc4j va perfectamente pero la coloco en el oracle aplication server y me da el siguiente error al llamar a un servlet

500 Internal Server Error
java.lang.NullPointerException at org.apache.commons.digester.Digester.getXMLReader(Digester.java:899) at org.apache.commons.digester.Digester.parse(Digester.java:1647) at org.apache.struts.action.ActionServlet.parseModuleConfigFile(ActionServlet.java:1006) at org.apache.struts.action.ActionServlet.initModuleConfig(ActionServlet.java:955) at org.apache.struts.action.ActionServlet.init(ActionServlet.java:470) at javax.servlet.GenericServlet.init(GenericServlet.java:258) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpApplication.loadServlet(HttpApplication.java:2354) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpApplication.findServlet(HttpApplication.java:4795) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpApplication.getRequestDispatcher(HttpApplication.java:2821) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:680) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:224) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].server.http.AJPRequestHandler.run(AJPRequestHandler.java:133) at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192) at java.lang.Thread.run(Thread.java:534)


y en el log me aparece lo siguiente

Started
NIDECOÑA: jsp: init
NIDECOÑA: action: init
NIDECOÑA: Error initializing servlet
java.lang.NullPointerException
at org.apache.commons.digester.Digester.getXMLReader(Digester.java:899)
at org.apache.commons.digester.Digester.parse(Digester.java:1647)
at org.apache.struts.action.ActionServlet.parseModuleConfigFile(ActionServlet.java:1006)
at org.apache.struts.action.ActionServlet.initModuleConfig(ActionServlet.java:955)
at org.apache.struts.action.ActionServlet.init(ActionServlet.java:470)
at javax.servlet.GenericServlet.init(GenericServlet.java:258)
at com.evermind.server.http.HttpApplication.loadServlet(HttpApplication.java:2354)
at com.evermind.server.http.HttpApplication.findServlet(HttpApplication.java:4795)
at com.evermind.server.http.HttpApplication.initPreloadServlets(HttpApplication.java:4889)
at com.evermind.server.http.HttpApplication.initDynamic(HttpApplication.java:1015)
at com.evermind.server.http.HttpApplication.<init>(HttpApplication.java:549)
at com.evermind.server.Application.getHttpApplication(Application.java:890)
at com.evermind.server.http.HttpServer.getHttpApplication(HttpServer.java:707)
at com.evermind.server.http.HttpSite.initApplications(HttpSite.java:625)
at com.evermind.server.http.HttpSite.setConfig(HttpSite.java:278)
at com.evermind.server.http.administration.DefaultHttpSiteAdministrator.bindWebApp(DefaultHttpSiteAdministrator.java:77)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at com.evermind.server.rmi.RMICallHandler.run(RMICallHandler.java:124)
at com.evermind.server.rmi.RMICallHandler.run(RMICallHandler.java:48)
at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:192)
at java.lang.Thread.run(Thread.java:534)