More news:
It seems it is happening with the query cache enabled, since at the location of
the exception the toString() of workspaceNode is:
WorkNode fqn=/org/hibernate/cache/StandardQueryCache dirty ver=null
When I disable the query cache, I get another similar exception:
Caused by: java.lang.NullPointerException
at
org.hibernate.util.ComparableComparator.compare(ComparableComparator.java:13)
at
org.hibernate.cache.OptimisticTreeCache$DataVersionAdapter.newerThan(OptimisticTreeCache.java:258)
at
org.jboss.cache.interceptors.OptimisticValidatorInterceptor.simpleValidate(OptimisticValidatorInterceptor.java:124)
at
org.jboss.cache.interceptors.OptimisticValidatorInterceptor.validateNodes(OptimisticValidatorInterceptor.java:101)
at
org.jboss.cache.interceptors.OptimisticValidatorInterceptor.invoke(OptimisticValidatorInterceptor.java:66)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
at
org.jboss.cache.interceptors.OptimisticLockingInterceptor.invoke(OptimisticLockingInterceptor.java:95)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
at
org.jboss.cache.interceptors.TxInterceptor.runPreparePhase(TxInterceptor.java:796)
at
org.jboss.cache.interceptors.TxInterceptor$LocalSynchronizationHandler.beforeCompletion(TxInterceptor.java:1061)
... 73 more
Now in order to force it to proceed, I tried to patch
org.hibernate.util.ComparableComparator.compare()
by adding if (x == null) return -1;
This seems to make it work, but I get:
WARN [OptimisticTreeCache] Unexpected optimistic lock check on inserted data
It seems that the core of the problem is that
org.hibernate.cache.OptimisticTreeCache$DataVersionAdapter.previousVersion is
null in some cases, probably set by
org.hibernate.cache.OptimisticTreeCache.writeLoad(), but I have no clue as to
why these lock checks occur, or whether these instances with a version or
previousversion set to null are ok.
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