Yes, but to explain it I must go a little deeper. My template looks like | <ui:repeat value="#{recipients}" var="rec"> | <m:to>#{rec}</m:to> | .... | </ui:repeat> | and recipients gets into the context by | @Asynchronous | public void send(List<String> recipients) { | Context c=Contexts.getEventContext(); | c.set("recipients", recipients); | renderer.render("..."); | } | The caller is a jBPM action class with: | Mailhandler mh=(Mailhandler)Components.getInstance(Mailhandler.class); | mh.send(new Vector<String>(getRecipients())); | If I only send one mail, everything works fine. If I send two at the same time (two mail actions in jBPM which are executed immediately one after the other), I get some error from class InternetAddress telling the recipient's syntax is wrong ("@domain" is missing). I think either the ui:repeat or the m:to gets confused in some way when simultaneously used in multiple threads. I checked everything, I can't find any other synchronizity side effect (for example in the recipients list - everything is copied before usage), so I think it must be some issue with the renderer. (I wrote this all from memory; if you need even more info, let me know, I'll post the exact strack trace when I'm back in office tomorrow) Marcus. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4118810#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...