[request-tracker-maintainers] Bug#848041: request-tracker4 issues with JSON::XS

[Michael Howe]

Hi James, Dom,

We've just reproduced the issue here, and it looks like it is indeed an
issue with JSON::XS (pulled in by default as a recommend of
libjson-perl) with mod_perl.  This is with stock configuration and no
customization to RT.

To reproduce, install the following:

apache2, request-tracker4, rt4-apache2, libapache2-mod-perl2

then in /etc/apache2/sites-enabled/000-default.conf:

Include /etc/request-tracker4/apache2-modperl2.conf

Ensure that the perl and actions modules are enabled, start up apache,
attempt to log in, get the error and see in the log:

#---8<-----------------------------------------------------------------
[20807] [Tue Apr 25 14:55:15 2017] [info]: Successful login for root from 192.168.100.1 (/usr/share/request-tracker4/lib/RT/Interface/Web.pm:831)
[20807] [Tue Apr 25 14:55:15 2017] [error]: encountered object '1', but neither allow_blessed, convert_blessed nor allow_tags settings are enabled (or TO_JSON/FREEZE method missing) at /usr/share/perl5/JSON.pm line 154.

Stack:
  [/usr/share/perl5/JSON.pm:154]
  [/usr/share/request-tracker4/lib/RT/Interface/Web.pm:193]
  [/usr/share/request-tracker4/lib/RT/Interface/Web.pm:4396]
  [/usr/share/request-tracker4/html/Elements/JavascriptConfig:87]
  [/usr/share/request-tracker4/html/Elements/Header:64]
  [/usr/share/request-tracker4/html/index.html:4]
  [/usr/share/request-tracker4/lib/RT/Interface/Web.pm:696]
  [/usr/share/request-tracker4/lib/RT/Interface/Web.pm:375]
  [/usr/share/request-tracker4/html/autohandler:53] (/usr/share/request-tracker4/lib/RT/Interface/Web/Handler.pm:209)
#---8<-----------------------------------------------------------------

(I haven't tried with fcgi/fastcgi, because I couldn't trivially get
the appropriate apache config sorted; hopefully, however, this  gives
you enough to go on.)

Hope this helps,

Michael

-- 
Michael Howe, Infrastructure and Hosting Team
Systems Development and Support
IT Services, University of Oxford