mod_perl file upload "end of file found" Or CGI.pm undefined filehandle

Jerzy2012 has asked for the wisdom of the Perl Monks concerning the following question:

Hello fellow Perl coders.

I spent half a day looking for a solution and didn't find a working one. I would appreciate any help.

I am trying to do a simple web based file upload script. It's a part of bigger project so I am using mod_perl (ModPerl::Registry)

In my main class named Main.pm I have following code:

    my $cgi = CGI->new;
    my $self = {    
        OBJ_cgi     => $cgi
    };
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In my module File.pm I have:

    my $r = Apache2::RequestUtil->request;
    my $req = Apache2::Request->new($r);
    my @upload = eval { $req->upload() };
    print STDERR Dumper($@);
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This gives me:

NAMES: $VAR1 = bless( {
                 'rc' => 70014,
                 '_r' => bless( do{\(my $o = '140573114765624')}, 'Apa
+che2::Request' ),
                 'file' => '/usr/lib/perl5/APR/Request.pm',
                 'func' => 'APR::Request::body',
                 'line' => 50
               }, 'APR::Request::Error' );
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If I execute it without eval, it throws following code in apache error log file:
[error] End of file found

My HTML form:

        <form action="uploaddocument.cgi" method="POST" enctype="multi
+part/form-data">
            <input type="file" name="file_content">

            <input type="hidden" name="id" value="2">
            <input type="hidden" name="save" value="1">
            <input type="submit" value="Upload file">
        </form>
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I checked it on two browsers(chrome, firefox). I checked this code on two different servers(Debian and CentOS). It doesn't work anywhere.

I tried to use a CGI.pm way of handling files:

    my $fh = $self->{OBJ_cgi}->upload('file_content');
    print STDERR Dumper($fh);
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And this prints undef to STDERR

The interesting part is that it correctly reads the name of file if I use param method instead of upload. Also during the script execution the file is correctly saved in /var/tmp/CGItemp...

I would be extremely grateful for any help.
Best regards,
Jerzy

UPDATE

I managed to get this thing working. In Main.pm in method new - first method that is executed at all - I added:

    my $r = Apache2::RequestUtil->request;
    my $req = Apache2::Request->new($r);
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I don't do anything with these objects. I don't pass those anywhere. I can even undef both of those right after declaring it. So my question changes to: Why this works after adding those 2 lines?

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