I tried to use CGI::Session together with CGI for keeping CustomObject between web page updates:

/cgi-bin/session:

#!/usr/bin/perl -wT
use strict;
use warnings;
use CGI;
use CGI::Session;
use CustomObject;

my $cgi = new CGI;
my $session = new CGI::Session("driver:File", $cgi, {Directory => "/tm
+p"});
print $cgi->header(-type    => "text/html",
                   -charset => "utf-8"),
      $cgi->start_html("Session management");
# Initialize session object.
unless ($session->param("custom_object")) {
    my $customObject = new CustomObject("test_login", "test_password")
+;
    $session->param("custom_object", $customObject);
    print $cgi->p("Custom object initialized");
}
my $customObject = $session->param("custom_object");
print $cgi->p("Login: " . $customObject->login()),
      $cgi->p("Password: " . $customObject->password()),
      $cgi->end_html();
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/usr/lib/perl5/site_perl/CustomObject.pm:

package CustomObject;

sub login {
    my $self = shift;
    return $self->{LOGIN};
}

sub new {
    my ($className, $login, $password) = @_;
    my $self = bless {
        LOGIN => $login,
        PASSWORD => $password
    }, $className;
    return $self;
}

sub password {
    my $self = shift;
    return $self->{PASSWORD};
}

1;
[download]

All I get is that CustomObject is instantiated each web page update and the /tmp directory is populated with cgisess_* files.