Item11546: Cant locate object method "TopicObject", in Foswiki/Prefs.pm line 311.

Certain Web/Topic configurations appear to break Prefs::HASH as called by WorkflowPlugin.

• Create a "Template" web beneath a real web. (ie. cp -a _default Sandbox/. )
• Attempt to view the topic. =bin/view/Sandbox/_default/WebHome

With WorkflowPlugin enabled, Foswiki crashes in Frefs.pm. With WorkflowPlugin disabled, Foswiki issues an "oops". Access Denied - Attention - The "(Missing or illegal web)" web does not exist

Not sure if this is a bug in the Prefs that WorkflowPlugin exposes, or a bug in the plugin itself.

Can't locate object method "topicObject" via package "Foswiki::Prefs::HASH" at /var/www/foswiki/trunk/core/lib/Foswiki/Prefs.pm line 311.
 at /var/www/foswiki/trunk/core/lib/Foswiki/Prefs.pm line 311
   Foswiki::Prefs::popTopicContext('Foswiki::Prefs=HASH(0x8560808)') called at /var/www/foswiki/trunk/core/lib/Foswiki/Func.pm line 505
   Foswiki::Func::popTopicContext('System', 'WebBottomBarExample') called at /var/www/foswiki/trunk/core/lib/Foswiki/Plugins/WorkflowPlugin.pm line 94
   Foswiki::Plugins::WorkflowPlugin::_initTOPIC('System', 'WebBottomBarExample') called at /var/www/foswiki/trunk/core/lib/Foswiki/Plugins/WorkflowPlugin.pm line 517
   Foswiki::Plugins::WorkflowPlugin::commonTagsHandler('<span class="foswikiRight"> <a href="http://foswiki.org/"><im...', 'WebBottomBarExample', 'System', 1, 'Foswiki::Meta=HASH(0x8bd31c0)') called at /var/www/foswiki/trunk/core/lib/Foswiki/Plugin.pm line 288
   Foswiki::Plugin::invoke('Foswiki::Plugin=HASH(0x89a2240)', 'commonTagsHandler', '<span class="foswikiRight"> <a href="http://foswiki.org/"><im...', 'WebBottomBarExample', 'System', 1, 'Foswiki::Meta=HASH(0x8bd31c0)') called at /var/www/foswiki/trunk/core/lib/Foswiki/Plugins.pm line 340
   Foswiki::Plugins::dispatch('Foswiki::Plugins=HASH(0x8560838)', 'commonTagsHandler', '<span class="foswikiRight"> <a href="http://foswiki.org/"><im...', 'WebBottomBarExample', 'System', 1, 'Foswiki::Meta=HASH(0x8bd31c0)') called at /var/www/foswiki/trunk/core/lib/Foswiki/Macros/INCLUDE.pm line 299
   Foswiki::__ANON__() called at /usr/lib/perl5/vendor_perl/5.12.2/Error.pm line 415
   eval {...} called at /usr/lib/perl5/vendor_perl/5.12.2/Error.pm line 407
   Error::subs::try('CODE(0x8af6710)', 'HASH(0x8bd3670)') called at /var/www/foswiki/trunk/core/lib/Foswiki/Macros/INCLUDE.pm line 343
   Foswiki::INCLUDE('Foswiki=HASH(0x8514ed0)', 'Foswiki::Attrs=HASH(0x8af66f0)', 'Foswiki::Meta=HASH(0x8a9faf8)') called at /var/www/foswiki/trunk/core/lib/Foswiki.pm line 3107
   Foswiki::_expandMacroOnTopicRendering('Foswiki=HASH(0x8514ed0)', 'INCLUDE', '"System.WebBottomBarExample"', 'Foswiki::Meta=HASH(0x8a9faf8)') called at /var/www/foswiki/trunk/core/lib/Foswiki.pm line 2983
   Foswiki::_processMacros('Foswiki=HASH(0x8514ed0)', '%INCLUDE{"System.WebBottomBarExample"}%', 'CODE(0x84c5fc8)', 'Foswiki::Meta=HASH(0x8a9faf8)', 15) called at /var/www/foswiki/trunk/core/lib/Foswiki.pm line 3001
   Foswiki::_processMacros('Foswiki=HASH(0x8514ed0)', '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN...', 'CODE(0x84c5fc8)', 'Foswiki::Meta=HASH(0x8a9faf8)', 16) called at /var/www/foswiki/trunk/core/lib/Foswiki.pm line 2780
   Foswiki::innerExpandMacros('Foswiki=HASH(0x8514ed0)', 'SCALAR(0x8321350)', 'Foswiki::Meta=HASH(0x8a9faf8)') called at /var/www/foswiki/trunk/core/lib/Foswiki.pm line 3289
   Foswiki::expandMacros('Foswiki=HASH(0x8514ed0)', '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN...', 'Foswiki::Meta=HASH(0x8a9faf8)') called at /var/www/foswiki/trunk/core/lib/Foswiki/Meta.pm line 3142
   Foswiki::Meta::expandMacros('Foswiki::Meta=HASH(0x8a9faf8)', '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN...') called at /var/www/foswiki/trunk/core/lib/Foswiki/UI/Oops.pm line 124
   Foswiki::UI::Oops::oops('Foswiki=HASH(0x8514ed0)', '', 'WebPreferences', 'Foswiki::Request=HASH(0x8488800)', 0) called at /var/www/foswiki/trunk/core/lib/Foswiki/OopsException.pm line 222
   Foswiki::OopsException::generate('Foswiki::OopsException=HASH(0x8a91f48)', 'Foswiki=HASH(0x8514ed0)') called at /var/www/foswiki/trunk/core/lib/Foswiki/UI.pm line 379
   Foswiki::UI::__ANON__('Foswiki::OopsException=HASH(0x8a91f48)', 'SCALAR(0x81247d8)') called at /usr/lib/perl5/vendor_perl/5.12.2/Error.pm line 339
   eval {...} called at /usr/lib/perl5/vendor_perl/5.12.2/Error.pm line 329
   Error::subs::run_clauses('HASH(0x8514bf0)', 'Foswiki::OopsException=HASH(0x8a91f48)', undef, 'ARRAY(0x8124bb8)') called at /usr/lib/perl5/vendor_perl/5.12.2/Error.pm line 426
   Error::subs::try('CODE(0x804e338)', 'HASH(0x8514bf0)') called at /var/www/foswiki/trunk/core/lib/Foswiki/UI.pm line 435
   Foswiki::UI::_execute('Foswiki::Request=HASH(0x8488800)', 'CODE(0x84ffb70)', 'view', 1) called at /var/www/foswiki/trunk/core/lib/Foswiki/UI.pm line 274
   Foswiki::UI::handleRequest('Foswiki::Request=HASH(0x8488800)') called at /var/www/foswiki/trunk/core/lib/Foswiki/Engine/CGI.pm line 41
   Foswiki::Engine::CGI::run('Foswiki::Engine::CGI=HASH(0x81e51c8)') called at view line 24.

This was also reported in Support.Question749 - http://paste.ubuntu.com/550550/

-- GeorgeClark - 21 Feb 2012

This happens if you have an invalid WebName (must start with capital letter), because the pushTopicContext / popTopicContext combo will fail.

You can insert a "return undef unless Foswiki::Func::isValidWebName( $web );" before line 95 in WorkflowPlugin.pm to disable the workflow in such webs.

-- StephanOsthold - 03 Apr 2012

Michael, Crawford. Can you review the suggested fix? I don't do much with WorkflowPlugin.

-- GeorgeClark - 24 Oct 2012

it was treating the symptoms, and not the cause. The cause was a lot more complex and involved.

-- CrawfordCurrie - 18 Dec 2012

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