I\'m working on project with Servlet,JPA,EJB and JBoss in eclipse. As you can see in the title of my topic I have an error on my persistence.xml file but I don\'t know whi
This error means the version of Hibernate that you're using doesn't support version="2.1" in persistence.xml. Change the version to 2.0 (and update the xsi:schemaLocation for clarity).