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use Apache::Tika;

...

my $text = $tika->tika($pdf);
print "$text\n";

use Apache::Tika::Async;
 
...
use Data::Dumper;
print Dumper $tika->get_meta($fn);
print Dumper $tika->get_text($fn);

use Data::Dumper;
use Apache::Tika::Server;
...

my $fn = "x.pdf";
print Dumper $tika->get_text($fn);