Yes, it is compressed with tne ant's task ear and the MANIFEST.MF doesn't containg anything. Here is the MANIFEST.MF Manifest-Version: 1.0 Ant-Version: Apache Ant 1.6.5 Created-By: 1.5.0_10-b03 (Sun Microsystems Inc.) And here is the application.xml <?xml version="1.0" encoding="UTF-8"?> <application xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/application_1_4.xsd"> <web-uri>happyportal.war</web-uri> <context-root/> happyportal.jar The message apears only during the hot deployment. If I stop the server and I start it again, it doesn't apear any more. And the application works properly wether the exception is raised or not. I noticed also that the hot deployment doesn't work for EJB3, raising ClassCastException. Stoping and starting the server solve the problem. Thanks for the help, Nicolas View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4030644#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...