Item9139: trunk: Can't locate object method "new" via package "Foswiki::Engine::Apache2::MP20"

The error:

[Fri Jun 11 13:41:22 2010] [error] Can't locate object method "new" via package "Foswiki::Engine::Apache2::MP20" at (eval 30) line 1.\n at (eval 30) line 1\n\teval 'use Foswiki::Engine::Apache2::MP20; Foswiki::Engine::Apache2::MP20->new\n;' called at /usr/local/src/git.foswiki.org/trunk/core/lib/Foswiki.pm line 544\n\tFoswiki::BEGIN() called at (eval 30) line 0\n\teval {...} called at (eval 30) line 0\n\trequire Foswiki.pm called at /usr/local/src/git.foswiki.org/trunk/core/lib/Foswiki/Engine/Apache.pm line 75\n\tFoswiki::Engine::Apache::BEGIN() called at (eval 30) line 0\n\teval {...} called at (eval 30) line 0\n\trequire Foswiki/Engine/Apache.pm called at /usr/local/src/git.foswiki.org/trunk/core/tools/mod_perl_startup.pl line 41\n\tmain::BEGIN() called at (eval 30) line 0\n\teval {...} called at (eval 30) line 0\n\trequire /usr/local/src/git.foswiki.org/trunk/core/tools/mod_perl_startup.pl called at (eval 2) line 1\n\teval 'require qCompilation failed in require at /usr/local/src/git.foswiki.org/trunk/core/lib/Foswiki/Engine/Apache.pm line 75.\n at /usr/local/src/git.foswiki.org/trunk/core/lib/Foswiki/Engine/Apache.pm line 75\n\tFoswiki::Engine::Apache::BEGIN() called at /usr/local/src/git.foswiki.org/trunk/core/lib/Foswiki.pm line 75\n\teval {...} called at /usr/local/src/git.foswiki.org/trunk/core/lib/Foswiki.pm line 75\n\trequire Foswiki/Engine/Apache.pm called at /usr/local/src/git.foswiki.org/trunk/core/tools/mod_perl_startup.pl line 41\n\tmain::BEGIN() called at /usr/local/src/git.foswiki.org/trunk/core/lib/Foswiki.pm line 75\n\teval {...} called at /usr/local/src/git.foswiki.org/trunk/core/lib/Foswiki.pm line 75\n\trequire /usr/local/src/git.foswiki.org/trunk/core/tools/mod_perl_startup.pl called at (eval 2) line 1\n\teval 'require qCompilation failed in require at /usr/local/src/git.foswiki.org/trunk/core/tools/mod_perl_startup.pl line 41.\n at /usr/local/src/git.foswiki.org/trunk/core/tools/mod_perl_startup.pl line 41\n\tmain::BEGIN() called at /usr/local/src/git.foswiki.org/trunk/core/lib/Foswiki/Engine/Apache.pm line 41\n\teval {...} called at /usr/local/src/git.foswiki.org/trunk/core/lib/Foswiki/Engine/Apache.pm line 41\n\trequire /usr/local/src/git.foswiki.org/trunk/core/tools/mod_perl_startup.pl called at (eval 2) line 1\n\teval 'require qCompilation failed in require at (eval 2) line 1.\n at (eval 2) line 1\n\teval 'require q
[Fri Jun 11 13:41:22 2010] [error] Can't load Perl file: /usr/local/src/git.foswiki.org/trunk/core/tools/mod_perl_startup.pl for server peperomia-bp:0, exiting...

Adding this method to Foswiki::Engine::Apache::MP20 seems to make everything happy:

sub new {
    my $proto = shift;
    my $class = ref($proto) || $proto;
    my $this  = {};
    return bless $this, $class;
}

Which is a bit odd, given that this ISA Foswiki::Engine::Apache2 which itself ISA Foswiki::Engine::Apache which ISA Foswiki::Engine that implements new()...

Server env:

-- PaulHarvey - 11 Jun 2010

Don't you have to at least do a $this = $class->SUPER::new() ?

-- CrawfordCurrie - 11 Jun 2010

Paul,

How did you configure apache? There should be something like:

   PerlResponseHandler Foswiki::Engine::Apache

-- GilmarSantosJr - 11 Jun 2010

Crawford, the superclass does not implement new either (still get missing method error).

Gilmar, yes, this is the line, as per ApacheConfigGenerator

-- PaulHarvey - 12 Jun 2010

I just installed ModPerlEngineContrib (from trunk) on a clean checkout and it worked well. tools/mod_perl_startup.pl loads Foswiki::Engine::Apache, that adjusts $Foswiki::{Engine} to Foswiki::Engine::Apache2::MP20 (in my environment). This one loads Foswiki::Engine::Apache2. Foswiki::Engine::Apache was already loaded, so was Foswiki::Engine. It's very strange... try to test on a clean checkout and report the steps to reproduce, if the bug still shows.

I'm using Apache 2.2.15 with mod_perl 2.0.4 (Debian unstable).

-- GilmarSantosJr - 12 Jun 2010

mod_perl documentation has this to say about the use of PerlRequire:

PerlRequire does the same thing as PerlPostConfigRequire, but you have almost no control of when this code is going to be executed. Therefore you should be using either PerlConfigRequire (executes immediately) or PerlPostConfigRequire (executes just before the end of the server startup) instead. Most of the time you want to use the latter.

(emphasis mine)

I think my problem is related the order in which my apache2 servers are loading various modules. Today I am on a new test host and have been getting the same problems.

Replacing the PerlRequire had interesting results:

• PerlRequire - failed to start, stupid error message:

  [error] Can't load Perl file: /usr/.../tools/mod_perl_startup.pl for server foo.org.au:0, exiting...

  , but works after adding 'missing' new() method
• PerlModule - success starting, success accessing wiki
• PerlLoadModule - success starting, success accessing wiki
• PerlConfigRequire - failed to start apache2 (same error as PerlRequire), but success after after adding the 'missing' new() method
• PerlPostConfigRequire - failed to start apache2 (same as PerlRequire), but success after after adding the 'missing' new() method

Obviously we need to fix ApacheConfigGenerator (and NewApacheConfigGenerator). Any ideas?

-- PaulHarvey - 15 Oct 2010

Closing this. No activity or feedback since 2010, The new() method has been added.

-- GeorgeClark - 01 May 2017

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