Hi There, 

We've trying out CAS 5.2.4 in a clustered environment with the ticket 
registry in an Oracle 12c database.  We've been seeing tons of persistent 
deadlock errors after a load test - you kill one locker and another 
deadlock springs up.
Our DBA tells us that deadlocks were seen against the tables LOCKS, 
SERVICETICKET, TICKETGRANTINGTICKET
Checking the catalina.out log, tons of messages like this:

2018-10-04 22:45:06,347 WARN 
[org.hibernate.engine.jdbc.spi.SqlExceptionHelper] - <SQL Error: 60, 
SQLState: 61000>
2018-10-04 22:45:06,347 ERROR 
[org.hibernate.engine.jdbc.spi.SqlExceptionHelper] - <ORA-00060: deadlock 
detected while waiting for resource
>
2018-10-04 22:45:06,347 ERROR 
[org.apereo.cas.ticket.registry.DefaultTicketRegistryCleaner] - 
<org.hibernate.exception.LockAcquisitionException: could not execute 
statement>
javax.persistence.PersistenceException: 
org.hibernate.exception.LockAcquisitionException: could not execute 
statement
        at 
org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:149)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:157)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.query.internal.AbstractProducedQuery.executeUpdate(AbstractProducedQuery.java:1514)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.apereo.cas.ticket.registry.JpaTicketRegistry.deleteTicketGrantingTickets(JpaTicketRegistry.java:177)
 
~[cas-server-support-jpa-ticket-registry-5.2.4.jar:5.2.4]
        at 
org.apereo.cas.ticket.registry.JpaTicketRegistry.deleteSingleTicket(JpaTicketRegistry.java:145)
 
~[cas-server-support-jpa-ticket-registry-5.2.4.jar:5.2.4]
        at 
org.apereo.cas.ticket.registry.AbstractTicketRegistry.deleteTicket(AbstractTicketRegistry.java:126)
 
~[cas-server-core-tickets-5.2.4.jar:5.2.4]
        at 
org.apereo.cas.ticket.registry.AbstractTicketRegistry$$FastClassBySpringCGLIB$$d3c67a11.invoke(<generated>)
 
~[cas-server-core-tickets-5.2.4.jar:5.2.4]
        at 
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) 
~[spring-core-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:669)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.apereo.cas.ticket.registry.JpaTicketRegistry$$EnhancerBySpringCGLIB$$45967896.deleteTicket(<generated>)
 
~[cas-server-support-jpa-ticket-registry-5.2.4.jar:5.2.4]
        at sun.reflect.GeneratedMethodAccessor351.invoke(Unknown Source) 
~[?:?]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 
~[?:1.8.0_172]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_172]
        at 
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:133)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:121)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at com.sun.proxy.$Proxy104.deleteTicket(Unknown Source) ~[?:?]
        at 
org.apereo.cas.ticket.registry.DefaultTicketRegistryCleaner.cleanTicket(DefaultTicketRegistryCleaner.java:78)
 
~[cas-server-core-tickets-5.2.4.jar:5.2.4]
        at 
java.util.stream.ReferencePipeline$4$1.accept(ReferencePipeline.java:210) 
~[?:1.8.0_172]
        at 
java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175) 
~[?:1.8.0_172]
        at java.util.Iterator.forEachRemaining(Iterator.java:116) 
~[?:1.8.0_172]
        at 
java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
 
~[?:1.8.0_172]
        at 
java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580) 
~[?:1.8.0_172]
        at 
java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:270) 
~[?:1.8.0_172]
        at 
java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) 
~[?:1.8.0_172]
        at 
java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) 
~[?:1.8.0_172]
        at 
java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1382) 
~[?:1.8.0_172]
        at 
java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481) 
~[?:1.8.0_172]
        at 
java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471) 
~[?:1.8.0_172]
        at 
java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708) 
~[?:1.8.0_172]
        at 
java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) 
~[?:1.8.0_172]
        at java.util.stream.IntPipeline.reduce(IntPipeline.java:456) 
~[?:1.8.0_172]
        at java.util.stream.IntPipeline.sum(IntPipeline.java:414) 
~[?:1.8.0_172]
        at 
org.apereo.cas.ticket.registry.DefaultTicketRegistryCleaner.cleanInternal(DefaultTicketRegistryCleaner.java:69)
 
~[cas-server-core-tickets-5.2.4.jar:5.2.4]
        at 
org.apereo.cas.ticket.registry.DefaultTicketRegistryCleaner.clean(DefaultTicketRegistryCleaner.java:52)
 
~[cas-server-core-tickets-5.2.4.jar:5.2.4]
        at 
org.apereo.cas.ticket.registry.DefaultTicketRegistryCleaner$$FastClassBySpringCGLIB$$29f046b2.invoke(<generated>)
 
~[cas-server-core-tickets-5.2.4.jar:5.2.4]
        at 
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) 
~[spring-core-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
 
~[spring-tx-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)
 
~[spring-tx-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
 
~[spring-tx-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.apereo.cas.ticket.registry.DefaultTicketRegistryCleaner$$EnhancerBySpringCGLIB$$c03bddb2.clean(<generated>)
 
~[cas-server-core-tickets-5.2.4.jar:5.2.4]
        at 
org.apereo.cas.config.CasCoreTicketsSchedulingConfiguration$TicketRegistryCleanerScheduler.run(CasCoreTicketsSchedulingConfiguration.java:90)
 
~[cas-server-core-tickets-5.2.4.jar:5.2.4]
        at sun.reflect.GeneratedMethodAccessor331.invoke(Unknown Source) 
~[?:?]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 
~[?:1.8.0_172]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_172]
        at 
org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
 
~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
 
~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
~[?:1.8.0_172]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) 
~[?:1.8.0_172]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
 
~[?:1.8.0_172]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
 
~[?:1.8.0_172]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 
~[?:1.8.0_172]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 
~[?:1.8.0_172]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_172]
Caused by: org.hibernate.exception.LockAcquisitionException: could not 
execute statement
        at 
org.hibernate.dialect.Oracle8iDialect$3.convert(Oracle8iDialect.java:566) 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:111)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:97)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:178)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:45)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3198)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:3077)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3457)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:145)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:599) 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:473) 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:337)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:50)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.internal.SessionImpl.autoFlushIfRequired(SessionImpl.java:1398) 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.internal.SessionImpl.executeUpdate(SessionImpl.java:1507) 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.query.internal.AbstractProducedQuery.doExecuteUpdate(AbstractProducedQuery.java:1526)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.query.internal.AbstractProducedQuery.executeUpdate(AbstractProducedQuery.java:1504)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        ... 59 more
Caused by: java.sql.SQLException: ORA-00060: deadlock detected while 
waiting for resource

        at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:450) 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:399) 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:1017) 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:655) 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:249) 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:566) 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at 
oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:215) 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at 
oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:58) 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at 
oracle.jdbc.driver.T4CPreparedStatement.executeForRows(T4CPreparedStatement.java:943)
 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at 
oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1075)
 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at 
oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3820)
 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at 
oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:3897)
 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at 
oracle.jdbc.driver.OraclePreparedStatementWrapper.executeUpdate(OraclePreparedStatementWrapper.java:1361)
 
~[ojdbc7.jar-12.1.0.1.jar:12.1.0.1.0]
        at 
com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61)
 
~[HikariCP-2.7.7.jar:?]
        at 
com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java)
 
~[HikariCP-2.7.7.jar:?]
        at 
org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:175)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.engine.jdbc.batch.internal.NonBatchingBatch.addToBatch(NonBatchingBatch.java:45)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3198)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.persister.entity.AbstractEntityPersister.updateOrInsert(AbstractEntityPersister.java:3077)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.persister.entity.AbstractEntityPersister.update(AbstractEntityPersister.java:3457)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.action.internal.EntityUpdateAction.execute(EntityUpdateAction.java:145)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:599) 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:473) 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:337)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:50)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.internal.SessionImpl.autoFlushIfRequired(SessionImpl.java:1398) 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.internal.SessionImpl.executeUpdate(SessionImpl.java:1507) 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.query.internal.AbstractProducedQuery.doExecuteUpdate(AbstractProducedQuery.java:1526)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.query.internal.AbstractProducedQuery.executeUpdate(AbstractProducedQuery.java:1504)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        ... 59 more
2018-09-21 10:45:42,693 ERROR 
[org.springframework.scheduling.support.TaskUtils$LoggingErrorHandler] - 
<Unexpected error occurred in scheduled task.>
org.springframework.orm.jpa.JpaSystemException: Transaction was marked for 
rollback only; cannot commit; nested exception is 
org.hibernate.TransactionException: Transaction was marked for rollback 
only; cannot commit
        at 
org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:333)
 
~[spring-orm-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:244)
 
~[spring-orm-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:521)
 
~[spring-orm-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:765)
 
~[spring-tx-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:734)
 
~[spring-tx-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:518)
 
~[spring-tx-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:292)
 
~[spring-tx-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
 
~[spring-tx-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673)
 
~[spring-aop-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.apereo.cas.ticket.registry.DefaultTicketRegistryCleaner$$EnhancerBySpringCGLIB$$68446b18.clean(<generated>)
 
~[cas-server-core-tickets-5.2.4.jar:5.2.4]
        at 
org.apereo.cas.config.CasCoreTicketsSchedulingConfiguration$TicketRegistryCleanerScheduler.run(CasCoreTicketsSchedulingConfiguration.java:90)
 
~[cas-server-core-tickets-5.2.4.jar:5.2.4]
        at sun.reflect.GeneratedMethodAccessor337.invoke(Unknown Source) 
~[?:?]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 
~[?:1.8.0_172]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_172]
        at 
org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
 
~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
 
~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        at 
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
~[?:1.8.0_172]
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) 
~[?:1.8.0_172]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
 
~[?:1.8.0_172]
        at 
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
 
~[?:1.8.0_172]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 
~[?:1.8.0_172]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 
~[?:1.8.0_172]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_172]
Caused by: org.hibernate.TransactionException: Transaction was marked for 
rollback only; cannot commit
        at 
org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.commit(JdbcResourceLocalTransactionCoordinatorImpl.java:228)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.hibernate.engine.transaction.internal.TransactionImpl.commit(TransactionImpl.java:68)
 
~[hibernate-core-5.2.13.Final.jar:5.2.13.Final]
        at 
org.springframework.orm.jpa.JpaTransactionManager.doCommit(JpaTransactionManager.java:517)
 
~[spring-orm-4.3.16.RELEASE.jar:4.3.16.RELEASE]
        ... 21 more

After pasting all that, one thing jumped out at me:
2018-09-21 10:45:42,693 ERROR 
[org.springframework.scheduling.support.TaskUtils$LoggingErrorHandler] - 
<Unexpected error occurred in scheduled task.>
org.springframework.orm.jpa.JpaSystemException: Transaction was marked for 
rollback only; cannot commit; nested exception is 
org.hibernate.TransactionException: Transaction was marked for rollback 
only; cannot commit
That may be why transactions were uncommitted, which caused deadlocks.

Our DBA reports that the un-commited statements are something like:
delete from CAS5_AUTH.TICKETGRANTINGTICKET where TICKETGRANTINGTICKET_ID=:1
delete from CAS5_AUTH.TICKETGRANTINGTICKET where ID=:1

The questions remain: 
1.  why is this happening?
2.  what can be done about it?

Thanks a lot!
Trev 

PS - Happy Canadian Thanksgiving!


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- Website: https://apereo.github.io/cas
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