The lines ... 
my $objName = "foo";
my $testObj = new $objName();

[download]

work. Here is the code I used to test. 

#!/usr/bin/perl
use strict;
use warnings;

package Foo;
sub new {
    bless {}, shift;
}

package main;
my $objName = "Foo";
my $obj = $objName->new();
my $obj1 = new $objName();

[download]

BTW, you can use eval to use modules at runtime and capture problems finding the module, e.g. 

my $moduleName = "Foo";
eval "use $moduleName";
if ($@) { # could be problems with the loading of the module Foo
....
}

[download]

In reply to Re: Loading and using packages dynamically by bruceb3
in thread Loading and using packages dynamically by avarus.com.ar

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