UserManager userMgr = RollerFactory.getRoller().getUserManager();
PermissionsData perms = userMgr.getPermissions(form.getInviteId());
// TODO ROLLER_2.0: notify inviter that invitee has declined invitation
// TODO EXCEPTIONS: better exception handling here
userMgr.removePermissions(perms);
RollerFactory.getRoller().flush();
ActionMessages msgs = new ActionMessages();
msgs.add(null, new ActionMessage(
"yourWebsites.declined", perms.getWebsite().getHandle()));