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From Jose MarĂ­a Zaragoza <>
Subject Re: Get active session list
Date Tue, 20 Nov 2012 16:47:38 GMT
Sorry, I'm not following this thread but
Don't you want to use



You only have to parse this plain HTML webpage
I know that it's not very elegant but ....


2012/11/20 Cosio, Raul <>:
> As far as I know there is no way to get the list of active sessions for security reasons,
some time ago I wanted to display in my application a list of active sessions, what I did
is to implement some listeners, it is tricky but fun once you understand how it works.
> The first listener I implemented was an HttpSessionListener (declared in my web.xml file),
the listener has a method sessionCreated() and sessionDestroyed() that I used to update my
list of active sessions.
> The tricky part is when the server is restarted, because tomcat serializes the sessions
and after a restart there will be active sessions that are created without a sessionCreated()
event (which makes sense because they were not destroyed, just serialized). I handle this
situation with a SessionActivationListener interface that has a method sessionDidActivate(),
usefult to update my list of active sessions.
> The SessionActivationListener is used for any attribute that you add to a session with
the setAttribute() method. To make this listener available I just added an object that implements
the listener in the HttpSessionListener.sessionCreated() method.
> Regards
> -----Original Message-----
> From: Felipe Jaekel []
> Sent: Thursday, October 18, 2012 3:59 PM
> To: Tomcat Users List
> Subject: Re: Get active session list
> Found the following:
> context = (Context) wrapper.getParent();
>> host = (Host) context.getParent();
>> Context ctx = (Context) host.findChild(name);
>> Manager manager = ctx.getManager();
>> Session [] sessions = manager.findSessions();
> Had the same doubt I had when I looked at the PSI Probe code some days ago:
> how to handle the wrapper property?
> As a alternative I tried to implement *HttpSessionActivationListener*, but
> the methods aren't called when I restart the server.
> Thanks again for the help,
> Phillip
> 2012/10/18 Christopher Schultz <>
>> Hash: SHA1
>> Felipe,
>> On 10/18/12 9:34 AM, Felipe Jaekel wrote:
>> > I need to get the active session list. Searching about I saw a lot
>> > of people with the same question, but no answer.
>> >
>> > I don't want to write a list inside a HttpSessionListener and keep
>> > the session list there, because I use session serialization and the
>> > list inside the listener would be destroyed in case the server is
>> > restarted.
>> You *can* get notification of sessions being de-serialized from the
>> disk to maintain your list. Look at the other session-related
>> listeners in the servlet API.
>> You could also use JMX to get a list of sessions. Use JConsole to
>> poke-around in Tomcat's JMX beans and find the one(s) that expose
>> sessions. You may have to make your webapp "privileged" in order to
>> make JMX calls.
>> - -chris
>> Version: GnuPG/MacGPG2 v2.0.17 (Darwin)
>> Comment: GPGTools -
>> Comment: Using GnuPG with Mozilla -
>> A4MAoKv1hM4KBlaAS4a1UaP0ePqfRr3W
>> =n3WU
>> -----END PGP SIGNATURE-----
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