[ https://issues.apache.org/jira/browse/OPENJPA-35?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12479277 ] 

Patrick Linskey commented on OPENJPA-35:
----------------------------------------

> b) When openjpa.datacache=false, the application can still obtain a 
> non-null reference to StoreCache, however its delegate is null.
> What should OpenJPAEntityManagerFactory.getStoreCache() return
> when  openjpa.datacache=false ?

I think that this is fine behavior. You generally shouldn't need to get the StoreCache's delegate. The current behavior is nice because user code doesn't need to check whether or not a cache is active; instead, user code can just perform cache operations. Sure, they're no-ops when the cache isn't on, but that's fine.

> In-memory Delete operation fails with active DataCache
> ------------------------------------------------------
>
>                 Key: OPENJPA-35
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-35
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: datacache, query
>    Affects Versions: 0.9.0, 0.9.6
>         Environment: Only happens when DataCache is active
> 			<property name="openjpa.DataCache"                value="true"/>
> 			<property name="openjpa.RemoteCommitProvider"     value="sjvm"/>
>            Reporter: Pinaki Poddar
>            Priority: Critical
>             Fix For: 0.9.7
>
>         Attachments: openjpa-35.test.zip, openjpa-35.trace.txt
>
>
> Delete through query such as 
> 		Query query = em.createQuery("DELETE FROM Node n");
> 		query.executeUpdate();
> fails with following exception (only when DataCache is active)
> Exception in thread "main" <4|false|0.0.0> org.apache.openjpa.persistence.ArgumentException: org.apache.openjpa.datacache.QueryCacheStoreQuery
> 	at org.apache.openjpa.kernel.QueryImpl.deleteInMemory(QueryImpl.java:1029)
> 	at org.apache.openjpa.kernel.ExpressionStoreQuery$DataStoreExecutor.executeDelete(ExpressionStoreQuery.java:665)
> 	at org.apache.openjpa.datacache.QueryCacheStoreQuery$QueryCacheExecutor.executeDelete(QueryCacheStoreQuery.java:348)
> 	at org.apache.openjpa.kernel.QueryImpl.delete(QueryImpl.java:1012)
> 	at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:768)
> 	at org.apache.openjpa.kernel.QueryImpl.deleteAll(QueryImpl.java:831)
> 	at org.apache.openjpa.kernel.QueryImpl.deleteAll(QueryImpl.java:827)
> 	at org.apache.openjpa.kernel.DelegatingQuery.deleteAll(DelegatingQuery.java:544)
> 	at org.apache.openjpa.persistence.QueryImpl.executeUpdate(QueryImpl.java:299)
> 	at control.Test.clear(Test.java:87)
> 	at control.Test.run(Test.java:37)
> 	at control.Test.main(Test.java:178)
> Caused by: java.lang.ClassCastException: org.apache.openjpa.datacache.QueryCacheStoreQuery
> 	at org.apache.openjpa.kernel.ExpressionStoreQuery$DataStoreExecutor.executeQuery(ExpressionStoreQuery.java:651)
> 	at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:949)
> 	at org.apache.openjpa.kernel.QueryImpl.deleteInMemory(QueryImpl.java:1018)
> 	... 11 more

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