[jboss-user] [Tomcat, HTTPD, Servlets & JSP] - problem with loader constraint violation?

[ritesh163]

Hello everyone,
I am having problem with loader constraint violation. I am using jboss-5.0.1.GA with JDK 1.6. The server starts normally with welcome page of my application but when I start to login through that page, there occurs problem which is given below:


  | exception
  | javax.servlet.ServletException: Servlet.init() for servlet controller threw exception
  | 	org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
  | 	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
  | 	org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
  | 
  | root cause
  | 
  | java.lang.LinkageError: loader constraint violation: when resolving method "javax.xml.parsers.DocumentBuilder.parse(Lorg/xml/sax/InputSource;)Lorg/w3c/dom/Document;" the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) of the current class, np/com/remitron/admin/utility/Config, and the class loader (instance of <bootloader>) for resolved class, javax/xml/parsers/DocumentBuilder, have different Class objects for the type org/xml/sax/InputSource used in the signature
  | 	np.com.remitron.admin.utility.Config.init(Config.java:33)
  | 
  | 

Can anyone suggest me, what this exception means? and also how to solve this problem?

The code in config.java file is given below:


  | protected void init(ServletContext sctx,String xmlFile) throws Exception
  |     {        
  |         InputStream is=null;
  |         try {
  |              is=sctx.getResourceAsStream(xmlFile);        
  |              DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();             
  |              DocumentBuilder builder=factory.newDocumentBuilder();                          
  |              Document doc=builder.parse(new InputSource(is));             
  |              root=doc.getDocumentElement();
  |              
  |         }
  |         
  |         finally{
  |             if(is!=null)
  |             {
  |                 is.close();
  |             }
  |         }
  |     }
  | 
  | 

Thank you.

-Ritesh

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