Thanks for your advise but my process is ready and i dont have time to change the kit now. I customized the other commandbutton and the interface by acting upon the .JSP except this one .... My problem is linked to the FacesServlet.java. Thanks. Regards. You can see the error message: description The server encountered an internal error () that prevented it from fulfilling this request. exception javax.servlet.ServletException: Error calling action method of component with id taskform:transitionButton javax.faces.webapp.FacesServlet.service(FacesServlet.java:109) org.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:55) org.jbpm.web.JbpmContextFilter.doFilter(JbpmContextFilter.java:83) org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:59) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81) root cause javax.faces.FacesException: Error calling action method of component with id taskform:transitionButton org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74) javax.faces.component.UICommand.broadcast(UICommand.java:106) javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90) javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:164) org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:271) org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86) javax.faces.webapp.FacesServlet.service(FacesServlet.java:94) org.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:55) org.jbpm.web.JbpmContextFilter.doFilter(JbpmContextFilter.java:83) org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:59) org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4047865#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...