UPDATE: This has been cross-posted, and it looks like the solution is to use print():

http://stackoverflow.com/questions/29795171/modifying-xml-file-and-saving-them-in-the-same-file-using-perl-and-xmltwig#29796073

Ignore this...

I looked at the tests on CPAN (http://cpansearch.perl.org/src/MIROD/XML-Twig-3.49/t/test_3_26.t), and they use flush():

use warnings;
use strict;
use XML::Twig;

my $twig = XML::Twig->new(
    pretty_print  => 'indented',
    twig_handlers => {
        jdk => sub {
            $_->set_text('JDK 1.8.0_40')->flush();
        },
    },
);
$twig->parsefile_inplace( 'nightly.xml', '.bak' );

__END__

<jdk>JDK 1.8.0_40</jdk>
<jdk>JDK 1.8.0_40</jdk>
[download]

I got it to create a backup (nightly.xml.bak) properly, and the original nightly.xml file was modified, but it duplicates the line for me. I am using an older version of XML::Twig, 3.37. I didn't see any open bug reports on this topic.

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