Exception shown when a student submits their quiz attempt

[anieminen]

Hi,

We are seeing a problem after upgrading plagiarism_turnitin plugin. When Turnitin is activated in quiz settings and a user tries to submit their quiz attempt, an exception is thrown and the attempt is not submitted.

Moodle version: 4.1.15
plagiarism_turnitin version: 4.1+ (2024120501)

Debug info:
Error code: generalexceptionmessage
Stack trace:
line 2617 of /plagiarism/turnitin/lib.php: Error thrown
line 159 of /plagiarism/turnitin/classes/observer.php: call to plagiarism_plugin_turnitin->event_handler()
line ? of unknownfile: call to plagiarism_turnitin_observer::quiz_submitted()
line 155 of /lib/classes/event/manager.php: call to call_user_func()
line 75 of /lib/classes/event/manager.php: call to core\event\manager::process_buffers()
line 835 of /lib/classes/event/base.php: call to core\event\manager::dispatch()
line 2310 of /mod/quiz/attemptlib.php: call to core\event\base->trigger()
line 2220 of /mod/quiz/attemptlib.php: call to quiz_attempt->fire_state_transition_event()
line 2030 of /mod/quiz/attemptlib.php: call to quiz_attempt->process_finish()
line 93 of /mod/quiz/view.php: call to quiz_attempt->handle_if_time_expired()

[davidscotson]

We hit this same issue, on 4.1.15 and plagiarism_turnitin version: 4.1+
(2024121901)

From some initial investigation it seems as if the change to add namespaces in this commit might be the cause:

d7d6173

A slightly earlier change checks for the existence of that class before using it in order to support both 4.2 upwards and older version of Moodle, 4.1 being the current LTS version:

c00e3438aa620df217805a827fd66e308f8b3be8

This seems related to the quiz namespaces changes mentioned in the mod_quiz changelog for 4.2:

https://github.com/moodle/moodle/blob/main/mod/quiz/upgrade.txt

[davidscotson]

Tagging @carl-hostrander as this seems an issue with a straightforward fix, so hopefully can be prioritised.

[qchan-mindfield]

Yes, actually this is a huge issue.. It's affecting our quizzes that need to be automatically submitted for grading, nearing our midterm season.