The exception has occurred when server has tried to load - org.apache.xcerces.impl.msg.XMLMessageFormatter, from my WEB-INF/lib, folder. Until that class loading, various classes from the same package has been successfully loaded! Right after reaching that jar, follow error occurs: | | ERROR [JBossContextConfig] XML error parsing: context.xml | org.jboss.xb.binding.JBossXBRuntimeException: Failed to create a new SAX parser | and little later, as you can see in my stack trace | 16:53:49,734 ERROR [JBossContextConfig] XML error parsing: jboss.web/localhost/context.xml.default | | | | | Do I need in my application context.xml? | | | | :-) well, I'm completely out of mind... For sure the exception occurs after trying accessing XMLMessageFormatter...So what should I do now? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4219568#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...