ReadOnlyException with Hibernate + EHcache TIM
----------------------------------------------
Key: CDV-840
URL: https://jira.terracotta.org/jira//browse/CDV-840
Project: Community Development
Issue Type: Bug
Components: Integration Modules
Affects Versions: 2.6.2
Reporter: Kunal Bhasin
Assignee: Issue Review Board
We are testing TC for Hibernate 3.2.5 using ehcache 1.3 within Tomcat 6 under
Linux.
We can see objects in the cache using the TC console roots. As we navigate the
webapp, we can see new objects entering the distributed cache.
However, queries that have setCacheable(true) receive an exception:
com.tc.object.util.ReadOnlyException:
*******************************************************************************
Attempt to write to a shared object inside the scope of a lock declared as a
read lock. All writes to shared objects must be within the scope of one or
more shared locks with write access defined in your Terracotta configuration.
Please alter the locks section of your Terracotta configuration so that this
access is auto-locked or protected by a named lock with write access.
For more information on this issue, please visit our Troubleshooting Guide at:
http://terracotta.org/kit/troubleshooting
Caused by Thread: TP-Processor9 in VM(2)
Failed To Modify Field: org.hibernate.type.EntityType.returnedClass in
org.hibernate.type.EntityType
*******************************************************************************
at
com.tc.object.tx.ClientTransactionManagerImpl.makeReadOnlyException(ClientTransactionManagerImpl.java:765)
at
com.tc.object.tx.ClientTransactionManagerImpl.fieldChanged(ClientTransactionManagerImpl.java:607)
at com.tc.object.TCObjectImpl.objectFieldChanged(TCObjectImpl.java:297)
at org.hibernate.type.EntityType.__tc_setreturnedClass(EntityType.java)
at org.hibernate.type.EntityType.getReturnedClass(EntityType.java:174)
at org.hibernate.cache.QueryKey.equals(QueryKey.java:65)
at java.util.HashMap.getEntry(HashMap.java:349)
at java.util.HashMap.__tc_getEntryUnderResolvedLock(HashMap.java)
at java.util.HashMap.get(HashMap.java)
at
com.tcclient.cache.CacheDataStore.findCacheDataUnlocked(CacheDataStore.java:330)
at com.tcclient.cache.CacheDataStore.get(CacheDataStore.java:183)
at com.tcclient.ehcache.TimeExpiryMap.get(TimeExpiryMap.java:106)
at net.sf.ehcache.store.MemoryStore.get(MemoryStore.java:130)
at net.sf.ehcache.Cache.searchInMemoryStore(CacheTC.java:871)
at net.sf.ehcache.Cache.get(CacheTC.java:734)
at net.sf.ehcache.hibernate.EhCache.get(EhCache.java:82)
at org.hibernate.cache.StandardQueryCache.get(StandardQueryCache.java:105)
at org.hibernate.loader.Loader.getResultFromQueryCache(Loader.java:2161)
at org.hibernate.loader.Loader.listUsingQueryCache(Loader.java:2126)
at org.hibernate.loader.Loader.list(Loader.java:2096)
at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:94)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1569)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
at org.hibernate.impl.CriteriaImpl.uniqueResult(CriteriaImpl.java:305)
The exceptions go away if we setCacheable(false).
Our TIMs are:
<module name="tim-hibernate-3.2.5" version="1.1.2" />
<module name="tim-ehcache-1.3" version="1.1.2" />
<module name="tim-ehcache-commons" version="1.1.2" />
<module name="tim-cglib-2.1.3" version="1.1.2"/>
<module name="clustered-commons-collections-3.1" version="2.6.2"/>
Our code uses CacheManager.getInstance(), so as per the TC documentation we do
not specify a root as the TIM is taking care of that for us.
We enabled autolocks for all synchronized methods by using:
<locks>
<autolock>
<lock-level>write</lock-level>
<method-expression>* *..*.*(..)</method-expression>
</autolock>
</locks>
We also tested with the 'locks' section commented out and therefore not
explicitly setting locks but relying on the TIMs.
Our hibernate cfg enables ehcache for L2 cache and including queries:
<property name="hibernate.cache.use_second_level_cache">true</property>
<property name="hibernate.cache.use_query_cache">true</property>
<property
name="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</property>
<!-- <property
name="hibernate.cache.provider_class">net.sf.ehcache.hibernate.SingletonEhCacheProvider</property>
-->
Note that we tried both EhCacheProvider and the Singleton
Any hints as to why query caching causes the ReadOnlyException?
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