10:18 a.m.
Richard Evans [https://community.jboss.org/people/r3vans] created the discussion
"last_read_date update causing StaleObjectStateException"
To view the discussion, visit: https://community.jboss.org/message/760399#760399
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Hello there,
*jbpm 5.3.0.Final*
I have a server running jbpm happily on a couple of load-balanced hosts. All fine until I
use a simple Web interface to view details of a running peocess. This UI calls
kSession.getProcessInstance(id) to access process variables. The server handling that
process promptly gets a hibernate StaleObjectStateException. The immediate cause seems to
be that getProcessInstance generates an update to process_instance_info.last_read_date.
The server falls over when attempting update a process following an event.
What I am attempting to do seems reasonable - providing a readonly view to an in-flight
process. Is there something flawed in my approach? If I removed the call to
updateLastReadDate() in JPAProcessInstanceManager would there be any repercussions other
than an inaccurate value in the field?
Thanks for any help.
Richard
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12:48 p.m.
New subject: [jBPM] - Re: last_read_date update causing StaleObjectStateException
Maciej Swiderski [https://community.jboss.org/people/swiderski.maciej] created the
discussion
"Re: last_read_date update causing StaleObjectStateException"
To view the discussion, visit: https://community.jboss.org/message/761465#761465
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I believe issue you are experiencing is already resolved on master. Cause of it was
persistence context was not cleared after transaction commit (extended persistence
context) which in load balanced environment causes stale object exceptions. Worth to give
a try with latest build to see if the issue is resolved for your environment too.
HTH
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3:30 a.m.
New subject: [jBPM] - Re: last_read_date update causing StaleObjectStateException
Richard Evans [https://community.jboss.org/people/r3vans] created the discussion
"Re: last_read_date update causing StaleObjectStateException"
To view the discussion, visit: https://community.jboss.org/message/761575#761575
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Thanks Maciej.
Please excuse my ignorance but I have always used Maven to get my code. ...
1) When is master likely to find itself into a new release on the maven repo?
2) If I take code from master, I guess I'd have to take all modules from there rather
than mix & match with 5.3.0. Right?
As a matter of fact I have currently worked around my specific issue with a simple but
nasty hack...
The problem only surfaced when a read-only web application viewed a process running on
another server. It happened because the read-only application actually updated the
database due to the last_read_date maintenance. I therefore tweaked the code to suppress
this update when the process instance is retrieved on the read-only server. This seemed
to solve our problem.
Also worth saying that on the way to this work-around I first suppressed the update of the
last_read_date in +all+ code. This did not work because, surprisingly, this had the
side-effect that process_intance_info.process_instance_byte_array was never written to the
db and was always null.
Richard
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6:19 a.m.
New subject: [jBPM] - Re: last_read_date update causing StaleObjectStateException
Maciej Swiderski [https://community.jboss.org/people/swiderski.maciej] created the
discussion
"Re: last_read_date update causing StaleObjectStateException"
To view the discussion, visit: https://community.jboss.org/message/761888#761888
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Richard Evans wrote:
Please excuse my ignorance but I have always used Maven to get my code. ...
1) When is master likely to find itself into a new release on the maven repo?
That
is in fact event better, if you sonfigure it to use latest snapshot it will update it once
a day unless explicitly asked to update it with -U flag.
Richard Evans wrote:
2) If I take code from master, I guess I'd have to take all modules from there rather
than mix & match with 5.3.0. Right?
yes, you need to take all or nothing so to
say.
Another question is why your read only web application wants to get process instance from
session? If it is read only maybe history log and its query mechanism could be better fit
for it?
HTH
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