Thanks Tim, your suggestion works. Here is the changed code
Enumeration sessionAttributes = session.getAttributeNames();
ArrayList list = new ArrayList();
while(sessionAttributes.hasMoreElements()) {
String name = (String) sessionAttributes.nextElement();
if ((name.compareTo("userSession") != 0) &&
(name.compareTo("style") != 0) &&
(name.compareTo("moduleID") != 0) &&
(name.compareTo("listNavigatorMap") != 0))
list.add(name);
}
}
Iterator iList = list.iterator();
while(iList.hasNext()) {
session.removeAttribute((String) iList.next());
}
Imran
-----Original Message-----
From: Tim Funk [mailto:[EMAIL PROTECTED]
Sent: Saturday, July 19, 2003 5:48 AM
To: Tomcat Users List
Subject: Re: How to clean objects in user's session
Older versions of tomcat have their Enumeration from
session.getAttributeNames() backed by an Iterator. So if a change is made
you
get the ConcurrentModificationException. I know tomcat 5 does not have this
problem but I don't know about tomcat4. Since your using 4.1.24 - I am
guessing the change was not backported.
The easiest solution is to call invalidate - but this also usually logs the
user out too so it may not be acceptable. Once a session is invalidated - it
can't be used anymore for getting and setting stuff.
The alternative is clone/copy the Enumeration (probably the hard way by an
extra iteration) - then iterate through the copied version. The copied
version has no relation to the list so you can clear its atributes without
the exception.
-Tim
Imran Balkhi wrote:
> Hello,
>
> Our application is divided into multiple vertical views (ie, multiple
> company). User can work in only one vertical slice at a time (ie, abc
> company). Currently users have to logout and login again to change the
> vertical. There is a business requirement to provide ability to switch
> verticals without the need to logout and relogin. Here are my options.
>
>
> 1) invalidate the session object and create a new session. I am not sure
> if this is possible with logout and relogin routine. We are using our own
> authentication.
>
> 2) remove vertical specific objects from user's session. This option
> seems to be less intrusive on users. However, I am not able to remove
> objects Here is the test code
>
> if((userPreference.getCurrentCompanyId() > 0) &&
> userPreference.getCurrentCompanyId() != companyId){
> Enumeration sessionAttributes = session.getAttributeNames();
> while(sessionAttributes.hasMoreElements()) {
> String name = (String) sessionAttributes.nextElement();
> if ((name.compareTo("userSession") != 0) && //exclude vertical
> independent objects
> (name.compareTo("style") != 0) &&
> (name.compareTo("moduleID") != 0) &&
> (name.compareTo("listNavigatorMap") != 0))
> logger.debug ("Name : " + name);
> session.removeAttribute(name);
> }
> }
> }
>
> I am getting ConcurrentModificationException, detials are in attached
file.
>
> Can any one point out what am I doing wrong or let me know if there are
> better ways to get to goal.
>
> Thanks,
> Imran
>
>
>
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