hello, thanks for your reply. I changed the code of the client, and now I have the following error : "javax.ejb.EJBException: java.lang.IllegalArgumentException: Unknown entity: source.customer.Customer". the class it speaks about is a class I created in a JPA project. I added references to this JPA project in the EJB project, in the properties / "java build path" / projects, in "properties" / "java build path" / "order and export" (item enabled),"properties" / "java EE module dependencies" / (JPA .jar enabled), and in "properties" / "project references" (item "petstore_jpa" enabled). more references seems to be impossible, and yet I have an error telling me the JPA project isn't found. olivier. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4214265#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...