Hi,

We are running CAS 5.1.2 with Oracle 12 as the backend database for 
ticketing/audit logs and while load testing the environment we started running 
into issues with the database being deadlocked.   In our oracle trace logs we 
are seeing the following:


delete from TICKETGRANTINGTICKET where ticketGrantingTicket_ID=:1


In the cas logs we have the following:


2019-01-25 16:55:27,127 ERROR 
[org.springframework.boot.web.support.ErrorPageFilter] - <Forwarding to error 
page from request [/logout] due to exception [Exception thrown executing 
org.apereo.cas.web.flow.TerminateSessionAction@23fdf9ec in state 
'terminateSession' of flow 'logout' -- action execution attributes were 
'map[[empty]]']>
org.springframework.webflow.execution.ActionExecutionException: Exception 
thrown executing org.apereo.cas.web.flow.TerminateSessionAction@23fdf9ec in 
state 'terminateSession' of flow 'logout' -- action execution attributes were 
'map[[empty]]'
Caused by: javax.persistence.PersistenceException: 
org.hibernate.exception.LockAcquisitionException: could not execute statement
Caused by: java.sql.SQLException: ORA-00060: deadlock detected while waiting 
for resource



It seems to only be occurring during logout requests and not does seem to 
happen to all the requests.  Has anyone encountered something similar with 
deadlocks on the Database.


Thanks!


___________________
Juan Quintanilla

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