use Module qw(somesub);

[download]
is equivalent to 
BEGIN {
   require Module;
   Module->import('somesub') if Module->can('import');
}

[download]

You've prooved that require Module; works, and there's no reason to believe if Module->can('import') fails, so we're left with Module->import('somesub'). My bet is that importing works, but it's importing to the wrong namespace. Look into which namespace is used for once vs init. If the following work, my hypothesis is confirmed:

<%once>
# warn("once: " . __PACKAGE__ . "\n");

require Module;
# or:      use Module ();
# but not: use Module;
# An empty list disables import,
# but ommiting the list does not.
</%once>
...
...
...
<%init>
# warn("init: " . __PACKAGE__ . "\n");

Module->import(qw(somesub));

... &somesub(xxx);

</%init>

[download]

In reply to Re: Weird Exporter Problem in Mason with mod_perl2 by ikegami
in thread Weird Exporter Problem in Mason with mod_perl2 by PetaMem

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