Hum ... ok. Looked like converterId="javax.faces.Long" is more appropriate (the converter wasn't created but the exception was long is the traffic) But now I have a weird error : | javax.faces.el.EvaluationException: Cannot set value for expression '#{activitesByCollaborateurCrossData.realise}' to a new value of type java.lang.Long | | (...) | | Caused by: javax.ejb.EJBTransactionRolledbackException: java.lang.NullPointerException | | (...) | | Caused by: java.lang.NullPointerException | at crossTable.action.activitesByCollaborateurCrossDataBean.init(activitesByCollaborateurCrossDataBean.java:110) | The line 110 is a line in my @Create method, with absolutely nothing to do with the page parameter. It just crash here in fact ... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4088892#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...