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 <workflow
       type="uplfile" persister="Filesystem">
...
     <state name="finished" />
</workflow>

<actions>
     <type>uplfile</type>
...
     <action name="null"        class="Workflow::Action::Null" />
</actions>

package Upload_file;

...

1;

#! /bin/perl -w
...

$wf->execute_action('upload file');

Workflow 1 PITGKDNR currently at state INITIAL
Available actions: upload file
Can't locate object method "new" via package "myapp::Upload_file" at /
+lib/x86_64/pkg/perl-5.8.8/lib/site_perl/5.8.8/Workflow/Factory.pm lin
+e 546.

Upload_file->new()->execute();