thank you very much for your reply
I turned off my computer and tried it again a few hours later and it seemed
to work, then i made changes and then the second servlet wasnt able to cast
back to CHyperlink again. after putting the code back the way I had it, it
still wouldnt work.
So are you saying it is by chance if a different class loader loads each
servlet and this can effect the casting?
Also both servlets import the CHyperlink class.
One more note is the change I made that screwed it up after it was working
was attempting to forward the request to another servlet after adding the
CHyperlink objects to the vector. Does this ring any bells?
THanks again for your replies.
Ivan
----- Original Message -----
From: "Filip Hanik" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, April 27, 2001 3:27 PM
Subject: RE: Objects in Vector are loosing type
> if servlet1 is the servlet that puts the object into the vector and
servlet2
> is the servlet that tries to read them.
> then these servlet may be loaded with different class loaders, which might
> indicate that each one of these servlets have loaded the class CHyperLink
> with different class loaders, hence you get a ClassCastException.
>
> the only way to solve this is if the class CHyperLink loaded with the same
> class loader.
>
> one option is to:
> remove the class from any WEB-INF/lib or WEB-INF/classes location (hide
them
> from the adaptive class loader)
> add the class into a separate directory and set your system classpath to
> include that location.
> the CHyperLink class will now be loaded using the System class loader when
> both servlets try to access it
>
> hope this helps
> Filip
>
> ~
> Namaste - I bow to the divine in you
> ~
> Filip Hanik
> Software Architect
> [EMAIL PROTECTED]
> www.filip.net
> -----Original Message-----
> From: Ivan [mailto:[EMAIL PROTECTED]]
> Sent: Friday, April 27, 2001 2:14 PM
> To: [EMAIL PROTECTED]
> Subject: Objects in Vector are loosing type
>
>
> Does anyone know what is going on with the this weird problem?
>
> I have a class named CHyperklink
>
> I putting a vector into a session object and then adding CHyperlink
objects
> to the vector.
>
> When I retrieve the vector (with no problem) from the session object, I
can
> cast the objects back to CHyperlinks if do it in the same servlet that put
> the objects in the vector.
>
> If i retrieve the objects from the vector from a diffrent servlet than the
> one the put the objects into the vector, they all come out of the vector
but
> they are not instanceof CHyperlink anymore and I cannot cast them back to
> CHyperlink.
>
> When i call tostring() on the objects in the vector i get output
indicating
> that they are still CHyperlinks.
>
> I am stuck because i cant cast back to the CHyperlink and call the
> appropriate methods. Does anyone know what is happending?
>
>
> Here is output for tostring calls on objects in vector
>
> novick.urlprog.CHyperlink@f11e4598
> novick.urlprog.CHyperlink@97064598
> novick.urlprog.CHyperlink@942a4598
> novick.urlprog.CHyperlink@909e4598
> novick.urlprog.CHyperlink@9c5a4598
>
> Here is code for inserting vector
>
> CHyperlink hlink;
> hlink = new CHyperlink(address, description, name);
> // create hyperlink object
>
> HttpSession session = request.getSession();
> // get session
>
> Vector urls = (Vector) session.getAttribute("vector");
> // get vector from session
>
> if (urls == null)
> // vector does not exist yet
> {
> urls = new Vector();
> // create new vector
>
> session.setAttribute("vector",urls);
> // adds urls vector to session if not already there
> }
>
> urls.add(hlink);
> // add the hyperlink to the vector
>
> here is code for retrieving vector
>
> HttpSession session = request.getSession();
>
> Vector v2 = (Vector) session.getAttribute("vector");
> // get vector from session
>
> Object obj;
> CHyperlink link;
> // temp variables
>
> if ( v2 != null)
> {
> out.print("Got the vector");
>
> for (int i = 0 ; i < v2.size() ; ++i)
> {
> obj = v2.get(i);
>
> if (obj instanceof novick.urlprog.CHyperlink)
> {
> link = (CHyperlink) obj;
> out.print("<br> " + link.GetHTML());
> }
>
> else
> {
> out.print("<br> " + obj.toString() );
> }
> }
> }
>
>
