ClassCastException (NullPointerException)

[Jo�o Robertson Kramer Santana]

        Sorry, instead on ClassCastException read NullPointerException.  It
seams that the new class can´t connect to the previous HttpSession.
        bye


>  -----Original Message-----
> From:         João Robertson Kramer Santana
> Sent: Quinta-feira, 1 de Fevereiro de 2001 14:42
> To:   '[EMAIL PROTECTED]'
> Subject:      ClassCastException
>
>       We are using Tomcat 3.2.1 and it is configured with "autoreload"
> because in an developement environment we are always making changes to the
> source code and don´t want to stop/start the Web Server every time a new
> or upgraded servlet is ready to be tested. This has been be the ideal
> developemnt environment for us until we started to have problems wit a
> ClassCastException.
>       The problem is that we are using the HttpSession to store
> information about the logged user in a class named "Usuario". There is a
> starting servlet that is resposible for creating the user class
> ("Usuario") and storing it in the HttpSession. The other classes access
> the HttpSession , retreive the user object and make a cast to the class
> named Ususario. This works fine until the moment we need to upgrade a
> class with a new version. This time, when the "upgraded class" retreives
> the user object from the HttpSession and tries to make a cast an
> ClassCastException occurs. This error does not occur with the other
> classes that were not upgraded.
>       Are we forgetting something important about the how the servlets
> work ? Is this a limitation or problem in the Tomcat 3.2.1 implemntation ?
> Can someone bring us some ligth on what is going on.
>
>       Thanks in advance for the help.
>
>       bye
>               jk
>
>

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