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After upgrading Joomla to 3.8.1 the cron job stopped working as reported here. I have applied the update the Joomla.php file as suggested in the answers. This gets rid of the original error. However now I am getting this error: PHP Notice: Constant JPATH_ISWIN already defined in /home/fava/public_html/libraries/import.legacy.php on line 64 Notice: Constant JPATH_ISWIN already defined in /home/fava/public_html/libraries/import.legacy.php on line 64 PHP Notice: Constant JPATH_ISMAC already defined in /home/fava/public_html/libraries/import.legacy.php on line 65 Notice: Constant JPATH_ISMAC already defined in /home/fava/public_html/libraries/import.legacy.php on line 65 PHP Notice: Constant JROUTER_MODE_RAW already defined in /home/fava/public_html/libraries/import.legacy.php on line 72 Notice: Constant JROUTER_MODE_RAW already defined in /home/fava/public_html/libraries/import.legacy.php on line 72 PHP Notice: Constant JROUTER_MODE_SEF already defined in /home/fava/public_html/libraries/import.legacy.php on line 79 Notice: Constant JROUTER_MODE_SEF already defined in /home/fava/public_html/libraries/import.legacy.php on line 79 PHP Notice: Constant JROUTER_MODE_RAW already defined in /home/fava/public_html/libraries/import.php on line 60 Notice: Constant JROUTER_MODE_RAW already defined in /home/fava/public_html/libraries/import.php on line 60 PHP Notice: Constant JROUTER_MODE_SEF already defined in /home/fava/public_html/libraries/import.php on line 67 Notice: Constant JROUTER_MODE_SEF already defined in /home/fava/public_html/libraries/import.php on line 67 Error displaying the error page: Application Instantiation Error: Failed to start the session because headers have already been sent by "/home/fava/public_html/libraries/import.legacy.php" at line 64.

I have tried manually clearing the Joomla session table but no luck. I have also update CiviCRM to 4.7.27 and applied the patches as mentioned here but the same error is still occurring.

  • I've just tested this again and I'm not convinced that the patch for CRM-21203 works for cron jobs that call cron.php, only cli.php. Your output looks as though you are using cron.php; as a workaround you could try having the cron job execute php /path/to/civicrm/bin/cli.php -s site -u user -p password -e Job -a execute Note: I am also getting the PHP notices for constant already defined but they do not stop the job running via cli.php. – Andrew Thompson Nov 6 '17 at 11:42
  • Thanks Andrew, I am getting the errors using cli.php so I decided to change to cron.php and the cron job is now executing, not all the the jobs are running properly but atleast the we are starting to get somewhere – AshLock - Alltraders Nov 7 '17 at 22:51
  • I should mention that for me even using cli.php there are still Notices, but the scheduled jobs run properl. But with cli.php I don't the Application Instantiation Error at the end - I only get that with cron.php. – Andrew Thompson Nov 8 '17 at 23:23
  • I think there are still problems on CiviCRM 4.7.28. I've added to the existing issue here – Andrew Thompson Jan 2 '18 at 14:12
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I have updated Joomla to 3.8.5 and updated CiviCRM to 4.7.31 (I'm using PHP version 5.6.34.) and the CRON job still didn't work.

I found and applied this patch and it worked. Thank you to Andrew Thompson for your work on this issue.

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It looks like import.legacy.php is re-definining existing constants (or called twice)

I'm not familiar with Joomla, but can you try to remove requiring this file in civi (comment out line 565 in that file)

https://github.com/civicrm/civicrm-core/blob/master/CRM/Utils/System/Joomla.php#L565

  • There are still some problems in CRM/Utils/System/Joomla.php. When I was looking at CRM-21203 I did notice that CiviCRM should not be requiring both of Joomla's import.php and import.legacy.php as the content of import.php is really a subset of import.legacy.php But there is still something else that stops cron.php working. – Andrew Thompson Nov 6 '17 at 11:49

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