Jboss does attempt, and made, temp\ directorium, and inside it store deployed applications configurations files. The java.io.IOException occurs when I omit xercesIml.jar file from lib folder of my application. But it's not point because, why I cannot isolate classloading on my application (to use it's ONLY libraries. I don want to remove xercesIml.jar, because I 'll get another exception, and another and another...It's not a point ( I cannot remove all libraries). Let's return on first exception the source : | Caused by: java.lang.ClassCastException: org.apache.xerces.parsers.StandardParserConfiguration canno | t be cast to org.apache.xerces.xni.parser.XMLParserConfiguration | | why this occurs, if I perform correct isolation of class loading, that is the issue???? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4219640#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...