Exception during sending mail java.lang.IllegalArgumentException: 'To' is a required field

[Junfeng Liu]

Some of our jira software users says that they can not receive email notifications after a certain day. They can receive the test email. And email notifications for other users works well. The mail queue is almost empty. And the result is empty for SQL :

select * from AO_733371_EVENT WHERE USER_KEY='JIRAUSER14928' ORDER BY CREATED DESC

'JIRAUSER14928' is one of the users who can't receive email notifications.

Here is the errors in atlassian-jira-outgoing-mail.log:

2023-03-31 17:24:36,690+0800 ERROR [] Caesium-1-1 ServiceRunner [c.a.m.o.c.a.j.p.i.batching.cron.BatchNotificationJob] Exception during sending mail
java.lang.IllegalArgumentException: 'To' is a required field
at com.atlassian.mail.Email.<init>(Email.java:55) [atlassian-mail-5.1.2.jar:?]
at com.atlassian.jira.mail.Email.<init>(Email.java:61) [jira-api-8.20.8.jar:?]
at com.atlassian.jira.mail.Email.<init>(Email.java:46) [jira-api-8.20.8.jar:?]
at com.atlassian.jira.plugins.inform.batching.BatcherServiceImpl.createEmail(BatcherServiceImpl.java:147) [batching-plugin-2.0.3.jar:?]
at com.atlassian.jira.plugins.inform.batching.cron.BatchNotificationJob.sendEmail(BatchNotificationJob.java:159) [batching-plugin-2.0.3.jar:?]
at com.atlassian.jira.plugins.inform.batching.cron.BatchNotificationJob.processBatches(BatchNotificationJob.java:144) [batching-plugin-2.0.3.jar:?]
at com.atlassian.jira.plugins.inform.batching.cron.BatchNotificationJob.processEventBatch(BatchNotificationJob.java:127) [batching-plugin-2.0.3.jar:?]
at com.atlassian.jira.plugins.inform.batching.cron.BatchNotificationJob.lambda$notifyUsers$0(BatchNotificationJob.java:100) [batching-plugin-2.0.3.jar:?]
at com.atlassian.jira.plugins.inform.performance.MeasurementWorkerFactory$1.measure(MeasurementWorkerFactory.java:41) [event-plugin-2.0.3.jar:?]
at com.atlassian.jira.plugins.inform.batching.cron.BatchNotificationJob.notifyUsers(BatchNotificationJob.java:97) [batching-plugin-2.0.3.jar:?]
at com.atlassian.jira.plugins.inform.batching.cron.BatchNotificationJob.runJob(BatchNotificationJob.java:82) [batching-plugin-2.0.3.jar:?]
at com.atlassian.jira.plugins.inform.batching.cron.ConditionalJobRunner.runJob(ConditionalJobRunner.java:33) [batching-plugin-2.0.3.jar:?]
at com.atlassian.jira.plugins.inform.batching.cron.ConditionalJobRunner.runJob(ConditionalJobRunner.java:33) [batching-plugin-2.0.3.jar:?]
at com.atlassian.jira.plugins.inform.batching.cron.OncePerClusterJobRunner.runJob(OncePerClusterJobRunner.java:46) [batching-plugin-2.0.3.jar:?]
at com.atlassian.scheduler.core.JobLauncher.runJob(JobLauncher.java:134) [atlassian-scheduler-core-3.0.1.jar:?]
at com.atlassian.scheduler.core.JobLauncher.launchAndBuildResponse(JobLauncher.java:106) [atlassian-scheduler-core-3.0.1.jar:?]
at com.atlassian.scheduler.core.JobLauncher.launch(JobLauncher.java:90) [atlassian-scheduler-core-3.0.1.jar:?]
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.launchJob(CaesiumSchedulerService.java:435) [atlassian-scheduler-caesium-3.0.4.jar:?]
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.executeClusteredJob(CaesiumSchedulerService.java:430) [atlassian-scheduler-caesium-3.0.4.jar:?]
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.executeClusteredJobWithRecoveryGuard(CaesiumSchedulerService.java:454) [atlassian-scheduler-caesium-3.0.4.jar:?]
at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.executeQueuedJob(CaesiumSchedulerService.java:382) [atlassian-scheduler-caesium-3.0.4.jar:?]
at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeJob(SchedulerQueueWorker.java:66) [atlassian-scheduler-caesium-3.0.4.jar:?]
at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeNextJob(SchedulerQueueWorker.java:60) [atlassian-scheduler-caesium-3.0.4.jar:?]
at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.run(SchedulerQueueWorker.java:35) [atlassian-scheduler-caesium-3.0.4.jar:?]
at java.base/java.lang.Thread.run(Unknown Source) [?:?]

[Aron Gombas _Midori_]

The top of the stack trace suggests that the email is rejected, because the "To" field (which stores the recipient's email address) is empty. 

I'd check the log before this particular error, as it may be a side-effect or consequence of a previous problem.

[Fabio Racobaldo _Herzum_]

Hi @Junfeng Liu ,

please could you check if JIRAUSER14928 has an email associated to the account?

Fabio