topic NullPointerExceptions for parallel & asynchronous continuation in Alfresco Forum

NullPointerExceptions for parallel & asynchronous continuation

sdeutschmann — Mon, 22 May 2017 09:52:54 GMT

Hello everybody!We have problems under heavy load (8 requests per second) with our setup. Currently we don't know, what is the cause of the problem, but I will describe our observations. We are using Activiti 5.21.1. NullPointerExceptions in logfile2017-05-08T10:40:34.255 ERROR [pool-4-thread-9] Job

Re: NullPointerExceptions for parallel & asynchronous continuation

gdharley — Mon, 22 May 2017 17:40:08 GMT

You will need to use the exclusive flag on any service tasks that flow into the join.

Likely this is the cause of your problem.

Greg

‌

Re: NullPointerExceptions for parallel & asynchronous continuation

sdeutschmann — Tue, 23 May 2017 06:39:27 GMT

Hi Greg,

I already have the exclusive flag set on all my service tasks. That's why I don't understand why that happens. I would expect, that all tasks marked as exclusive are executed by one thread, so that I don't get problems with concurrency.

Regards, Steffi

Re: NullPointerExceptions for parallel & asynchronous continuation

jdp — Wed, 20 Jun 2018 05:23:01 GMT

Hi,

I am facing same type of problem, is this resolved ? if yes, can you please share fix for the same.

Thanks

Re: NullPointerExceptions for parallel & asynchronous continuation

sdeutschmann — Wed, 20 Jun 2018 06:31:08 GMT

Hi Paresh,

in our case it seemed to be indeed wrong configuration. Accidentally we set lower values than the default ones for these variables (we forgot one 0):

activiti.asyncExecutor.timer.lockTime.millis
activiti.asyncExecutor.asyncJob.lockTime.millis

When we were setting them to the default value of 300.000, everything runs smooth.

One other problem we had at the beginning was caused by our database configuration: It was not vacuumed regularly.

Maybe it helps 🙂