Thanks. Can you say anything to the runtime problem: 11:25:56,760 ERROR [SeamPhaseListener] uncaught exception java.lang.IllegalStateException: Could not start transaction at org.jboss.seam.jsf.SeamPhaseListener.begin(SeamPhaseListener.java:571) I have tested with Seam 1.2.1GA and 2.0.0 Beta1. The JPA example in 1.2.1 works fine with the exception of the popup windows (e.g. How does the hotel booking wizard work?). These always show a "resource not found" window. In 2.0.0 Beta1 I get the same uncaught exception, although at a different point in the application to the CVS.2007-09-08_10-34-45 version. From some error reports in JIRA I gather that this exception has occurred sporadically but has no specific fix in place. Do you think anything is likely to happen in this area before release of 2.0.0? Thanks, Peter View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4082932#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...