> top.jsp in line 22 or so has a Page directive requiring a session.
>
> <%@ page session="true" %>

FWIW, we strategically removed that directive from the top include in
our theme. It's _very_ undesirable to start a session on ever request
to CAS. Theoretically sessions should be started only when needed; at
present a session is required for the /login URI exclusively.

> The comment on the commit suggests that the true is required for Tomcat 5.5,
> but false is fine for Tomcat 6 (and later?)

Can you or anyone else cite a reference that discusses this
requirement in further detail?

> I'd like to go further and make the default false again, with
> the comment suggesting that Tomcat 5.5 adopters make the change.

+1

Even if there is a requirement to have that directive for 5.5, I think
it's fair to assume those deployers are in the minority. 5.5 has
reached EOL [1], which is further justification.

M

[1] http://tomcat.apache.org/tomcat-55-eol.html

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