Convert Excel file to PDF using Perl CGI

I'm trying to convert an xlsx file to pdf using Perl CGI (Mason). Since I did not find a way to convert a file using pure perl, I'm using soffice to perform the job. This works fine until I do it through browser. The code responsible for conversion is pretty simple: my @cmd = ( "soffice", "--headless", "--convert-to", "pdf", $filename ); system(@cmd); This works fine on command line, when ran by a regular user, but running it as Apache user (Mason on Apache), throws an error:

(process:14954): dconf-CRITICAL **: 14:28:42.846: unable to create directory '/usr/share/httpd/.cache/dconf': Permission denied.  dconf will not work properly.

Can anyone point me to right direction? Is there a way to convert xlsx to pdf using just perl, not system commands? # Edit To pass dconf error, I've manually created the directory tree it's complaining about and chowned it to apache user, however, there's next error:

[Java framework] Error in function createSettingsDocument (elements.cxx).
javaldx failed!
Warning: failed to read path from javaldx

Same goes if I try unoconv:

Error: Unable to connect or start own listener. Aborting.

# Solution Starting unoconv --listener manually before the operation, does the trick and solves my issue. PDF files are being created.