I'm in the stages of implementing registration using IdentityManager. I created the registration of a new user with no problems but when I came to adding a listener to send an email, the rendering of the response page went awry.

@Observer(JpaIdentityStore.EVENT_USER_CREATED)
    public void sendNewRegEmail(User userIn) {
         Renderer renderer = Renderer.instance();
         log.info("RegistrationListener");
         log.info("User : #{userIn.id}");
         // Create new key
         ValidationCode code = new ValidationCode();
         code.setCode(ValidationCode.generate());
         code.setUser(userIn);
         userIn.setValidationCode(code);
         entityManager.persist(code);
         entityManager.persist(userIn);

         try {
                renderer.render("/mail/register/simple.xhtml");
                log.info("Email Sent");
            } catch (Exception e) {
                log.info("Email sending failed");
            }
         
         log.info("End of RegistrationListener");
    }

Instead of the next page being rendered as the response page (as before the email code was added), I get the current page but it's messed up, with bits in the wrong place and links with the wrong URLs.