Im not know if its a bug or rigth operation, but I wanna report this because I spent MANY time to discover this(3 months). When I create a project on Eclipse/Netbeans and xwork.xml inside a package, the XmlContainerProvider load two times because the IDEs put src and build folders on classpah. The ClassUtilLoader, loads xwork.xml (using Thread.getPorperty + Class.getProperty +...)for two folders causing load packages confilct(package already created). TO correct this issue, I extended XmlConfiguraton provider to override the loadFIle method to use Class.getSystemproperty only. Maybe is not a bug, but would be useful a observation on documentation about this behavior.