you will see that blessed things cannot be shared

my $x = bless [], 'X';
share $x;
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Dave.

Perhaps you'd comment on the disparity between that and this?

use threads; 
use threads::shared;;

my $x:shared = bless [], 'X';

Invalid value for shared scalar at (eval 4) line 1, <STDIN> line 2.
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---

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?

"Science is about questioning the status quo. Questioning authority".

The "good enough" maybe good enough for the now, and perfection maybe unobtainable, but that should not preclude us from striving for perfection, when time, circumstance or desire allow.

Invalid value for shared scalar at (eval 4)

You can only assign shared values to a shared variable. This works:

my $obj = bless [], 'X';
share $obj;
my $x:shared = $obj;
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Dave.

I haven't gotten it reliably working either way, can you give a working example?

C.

I haven't gotten it reliably working either way, can you give a working example?

Well, it depends rather on what exactly you are referring to as it, but

use threads;
use threads::shared;

sub X::DESTROY { warn "X::DESTROY(@_)\n" }

my $x = bless [], 'X';
share $x;
$x->[0] = 1;

sub f {
    $x->[0]++;
    warn "x->[0] = $x->[0]\n";
}
threads->new(\&f)->join for 1..5;

__END__
$ perl587t /tmp/p
x->[0] = 2
X::DESTROY(X=ARRAY(0x9d8b218))
x->[0] = 3
X::DESTROY(X=ARRAY(0x9da0500))
x->[0] = 4
X::DESTROY(X=ARRAY(0x9da0500))
x->[0] = 5
X::DESTROY(X=ARRAY(0x9da0500))
x->[0] = 6
X::DESTROY(X=ARRAY(0x9da0500))
X::DESTROY(X=ARRAY(0x9cd3c30))
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Dave.

I'm curious on how it can work with JComboBox then... ?

In Java all threads share a single address space. So although you can have a world of concurrency problems when writing threaded programs in Java, it's still perfectly possible to create complex objects in one thread and access them in another thread. And the AWT/Swing classes are largely thread-safe (for reading-type things anyway).