thanks I changed the code.

but $bbb variable is not exported to module BBB

package AAA;
use 5.20.1;
use lib ('.');
use BBB;
use parent('Exporter');
our @EXPORT=('$bbb','$msg');
our $bbb=BBB->new();
return 1;

package BBB;
use 5.20.1;
use lib '.';
use AAA;
sub new{
    my $class=shift;
    my $self=bless {},$class;
    return $self;
}
sub hello{
    my $self=shift;
    say 'hello';
}
sub hello2{
    my $self=shift;
    $bbb->hello();
}
return 1;

package main;
use 5.20.1;
use lib ('.');
use AAA;
$bbb->hello2();


perl test.pl
Global symbol "$bbb" requires explicit package name at BBB.pm line 16.
Compilation failed in require at AAA.pm line 4.
BEGIN failed--compilation aborted at AAA.pm line 4.
Compilation failed in require at test.pl line 4.
BEGIN failed--compilation aborted at test.pl line 4.
[download]

variable $bbb is exported only to package main, not package BBB. I want to make $bbb global to any packages

In your function hello2() you need to call hello() function with $self not with $bbb, as $self already has the BBB package object.

sub hello2{
    my $self=shift;
    #$bbb->hello();
    $self->hello();
}
[download]

---

All is well. I learn by answering your questions...

I know but that is differnt instance
What I'm trying to do is to invoke method $AAA::bbb->hello() , but without prefix AAA:: .
in package main I can invoke $AAA::bbb->hello() without prefix, but I can't in another package like BBB because of error saying " Global symball $bbb requires explicit package name".
The error is still same if I make another package CCC and invoke $AAA::bbb->hello() without prefix in package CCC.