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we have problems starting Jira after installation on a new Ubuntu 18.04 Server:


java.lang.OutOfMemoryError: unable to create new native thread at java.lang.Thread.start0(Native Method) at java.lang.Thread.start( at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.startWorkers( at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.startImpl( at com.atlassian.jira.scheduler.JiraCaesiumSchedulerService.startImpl( at com.atlassian.scheduler.core.AbstractSchedulerService.start( at com.atlassian.jira.scheduler.JiraSchedulerLauncher.proceedIfAllClear( at com.atlassian.jira.scheduler.JiraSchedulerLauncher.start( at com.atlassian.jira.startup.ActiveServicesLauncher.start( at com.atlassian.jira.startup.DefaultJiraLauncher.postDBActivated( at com.atlassian.jira.startup.DefaultJiraLauncher.lambda$postDbLaunch$2( at com.atlassian.jira.config.database.DatabaseConfigurationManagerImpl.doNowOrEnqueue( at com.atlassian.jira.config.database.DatabaseConfigurationManagerImpl.doNowOrWhenDatabaseActivated( at com.atlassian.jira.startup.DefaultJiraLauncher.postDbLaunch( at com.atlassian.jira.startup.DefaultJiraLauncher.lambda$start$0( at at com.atlassian.jira.startup.DefaultJiraLauncher.start( at com.atlassian.jira.startup.LauncherContextListener.initSlowStuff( at


I installed Jira as mentioned here:

The machine has 12GB Ram, there is no other Service installed.

I could send you the full log, but unfortunally your form doesn't have a file upload. Maybe I can send it afterwards?

Kind regards,

Thomas Liepe


2 answers

@Michael Kohls 


Can you check how the limits (number of procs, number of files) are configured for the suer running jira / system in general


see also



thanks for your answer.


Unfortunatelly, I already tried this. Rebooted the machine after setting the settings. No success.

Check also your heap size in <JIRA_INSTALL>/bin/

Even though the VM has 12GB, the Jira JVM may not be told to utilise all this memory. Default is 1GB I think

And if you need support from Atlassian, try

Hi Jimmy,

thanks for your answer.

I already set the heap size temporarly to 8GB. Default was 2.

When the error occurs, top shows me, that java uses ~1,5GB, so the limit is far from reached.


We only have a starter-license. Unfortunately, Atlassian doesn't gives support for this.

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