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From Mark Thomas <ma...@apache.org>
Subject Re: MaxInactiveInterval
Date Sun, 06 Nov 2016 12:00:50 GMT
On 06/11/2016 11:24, André Warnier (tomcat) wrote:
> On 04.11.2016 20:06, Mark Thomas wrote:

<snip/>

>> I did say "patches welcome" to André but since he is a committer that
>> should have been "commits welcome" ;)
>>
> 
> Guys, you all know my level of (in)competence in matters deeply Java.

You might be surprised at just how little Java I knew when I was made a
committer.

> I got my kudos by trying to help people in a general sense here, but
> when things seem to involve specific parts deep down the Tomcat code, I
> have to call for help.

As always, happy to provide pointers. This should end up as a docs fix
which I'd encourage you to consider tackling yourself.

> What I know is this, from the Servlet Specs 3.0 final :
> 
> quote
> 
> 12. session-config Element
> 
> The session-config defines the session parameters for this Web application.
> The sub-element *session-timeout* defines the default session time out
> interval
> for all sessions created in this Web application. The specified time out
> must be
> expressed in a whole number of minutes. If the time out is 0 or less,
> the container
> ensures the default behavior of sessions is never to time out. If this
> element is not
> specified, the container must set its default time out period.
> 
> unquote
> 
> So it appears that there is a difference between :
> - the WEB-INF/web.xml of a webapp specifying a session-timeout > 0, in
> minutes
> - the WEB-INF/web.xml of a webapp specifying a session-timeout =< 0
> (meaning, no timeout or "infinite")
> - the WEB-INF/web.xml of a webapp not specifying a session-timeout
> (container should supply a default value)
> 
> Which thus raises the question : if a web application does not set the
> session-timeout, what value is returned by Tomcat for
> getMaxInactiveInterval() ?
> 
> And the auxiliary question : can this (default) value be set somewhere
> in the configuration, or is this set in code ?
> 
> (Or is that the one that is set in (tomcat)/conf/web.xml :
>     <session-config>
>         <session-timeout>30</session-timeout>
>     </session-config>
> ?)

You are correct. The value from conf/web.xml provides the default if the
application's web.xml does not provide one.

> (and what happens if we remove that stanza from conf/web.xml ?)

There is a hard-coded default of 30 minutes (i.e. the same as the
explicit default in conf/web.xml) in o.a.catalina.core.StandardConetxt.

All of the above assumes that the standard components are being used.
Custom session managers, session implementations and/or Contexts could
all modify this behaviour.

To add to the fun, there is, effectively, an undocumented attribute on
Context - sessionTimeout - that could also be set in server.xml /
context.xml. Overall, the order of precedence should be:

- application specific web.xml
- conf/web.xml default
- sessionTimeout attribute on Context
- hard-coded default.

Mark


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