title: ViewExpiredException after upgrade to jsf2
body: <p>We recently upgraded a major platform from jsf 1.2 to 2.0. After upgrading we're getting several ViewExpiredException errors each hour. From reading up on the topic it seems that this is an expected exception when sessions expire, however we've reviewed the access logs and we are getting these exceptions even when requests are only 5 minutes apart in some cases. </p>
  
  <p>My questions are as follows: </p>
  
  <p>1) Other than session expiration, what other conditions might cause ViewExpiredException? </p>
  
  <p>2) The exception we're logging doesn't contain much detail about the exact condition that is causing the exception (missing session, corrupt session, unable to restore a particular component). Is there a way to introduce additional logging to find out the very specific situation that is triggering this exception in each case?</p>
  
  <p>Mojarra 2.0.4-b09
  Tomcat 6
  Using Memcached Session Manager for session replication</p>
  
  <p>Any help is appreciated. Thanks!</p>