XMLParser API throws java.lang.NullPointerException in a JSP/Struts Application after Migration to Oracle AS 10.1.3

(Doc ID 418008.1)

Last updated on MARCH 08, 2017

Applies to:

Oracle Containers for J2EE - Version: 10.1.3.0.0
This problem can occur on any platform.

Symptoms

After upgrading to 10gAS 10.1.3 , the application fails with the following error:

With XMLParser,

500 Internal Server Error

java.lang.NullPointerException at
org.apache.commons.digester.Digester.getXMLReader(Digester.java:902) at
org.apache.commons.digester.Digester.parse(Digester.java:1548) 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
org.apache.struts.tiles.ActionComponentServlet.init(ActionComponentServlet.java:104)
at javax.servlet.GenericServlet.init(GenericServlet.java:256) at
com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) ].server.http.HttpApplication.loadServlet(HttpApplication.java:2231) at

With Xerces 1.2.2,

java.lang.IllegalAccessError: tried to access method
org.apache.xerces.jaxp.SAXParserImpl.<init>(Ljavax/xml/parsers/SA
XParserFactory;
Ljava/util/Hashtable;)V from class
org.apache.xerces.jaxp.SAXParserFactoryImpl at
org.apache.xerces.jaxp.SAXParserFactoryImpl.newSAX
Parser(SAXParserFactoryImpl.java:96) 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
org.apache.struts.tiles.ActionComponentServlet.init(ActionComponentServlet.java:104) at
javax.servlet.GenericServlet.init(GenericServlet.java:256) at
com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) ].server.http.HttpApplication.loadServlet(HttpApplication.java:2231) at
com.evermind[Oracle Containers for J2EE 10g (10.1.3.0.0) ].server.http.HttpApplication.findServlet

Changes

The application was working well in the 9iAS deployment environment and has been migrated recently.

Cause

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