title: Can't configure tomcat access log session id with %S
body: <p>In tomcat 7, one is supposed to be able to add the user session id to the access log by adding "%S" to the access log valve pattern. However, this isn't working for me. All I'm getting is a "-" in the log instead of the expected long hex string.</p>
  
  <p>Is there some trick to this? Or is it a bug?</p>
  
  <p>Thanks,
  Fred</p>