User development, A new message was posted in the thread "Problem deploying EJB 3.0 jar to JBoss 5.0.1 GA": http://community.jboss.org/message/522062#522062 Author : Wolfgang Knauf Profile : http://community.jboss.org/people/WolfgangKnauf Message: -------------------------------------------------------------- Hi,   your "persistence.xml" lacks the schema declaration etc. It should start with this:   (if the following snippet is broken, it is the fault of the new wiki, I gave the "Wiki markup help" a try...)   {code:xml}<?xml version="1.0" encoding="UTF-8"?> <persistence xmlns="http://java.sun.com/xml/ns/persistence"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"     version="1.0">{code}   Hope this helps   Wolfgang -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/522062#522062