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https://issues.apache.org/jira/browse/OPENJPA-2068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13189160#comment-13189160
]
Rick Curtis commented on OPENJPA-2068:
--------------------------------------
The bug we hit resulted in the following exception:
<openjpa-2.2.0-SNAPSHOT-r422266:1232415 nonfatal user error>
org.apache.openjpa.persistence.InvalidStateException: This container was loaded
in large result set field "[x].entities.LrsEntityA.entitybs", but has been
removed from its owning field. Therefore, it can no longer be used.
at
org.apache.openjpa.jdbc.meta.strats.LRSProxyCollection.assertOwner(LRSProxyCollection.java:167)
at
org.apache.openjpa.jdbc.meta.strats.LRSProxyCollection.itr(LRSProxyCollection.java:127)
at
org.apache.openjpa.util.AbstractLRSProxyCollection.iterator(AbstractLRSProxyCollection.java:251)
at org.apache.openjpa.util.ProxyCollections.addAll(ProxyCollections.java:142)
at org.apache.openjpa.util.java$util$ArrayList$proxy.addAll(Unknown Source)
at
org.apache.openjpa.kernel.SingleFieldManager.proxy(SingleFieldManager.java:112)
at
org.apache.openjpa.kernel.StateManagerImpl.storeObjectField(StateManagerImpl.java:2602)
at
org.apache.openjpa.jdbc.meta.strats.StoreCollectionFieldStrategy.load(StoreCollectionFieldStrategy.java:524)
at org.apache.openjpa.jdbc.meta.FieldMapping.load(FieldMapping.java:934)
at
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.load(JDBCStoreManager.java:664)
at
com.ibm.ws.persistence.jdbc.kernel.WsJpaJDBCStoreManager.load(WsJpaJDBCStoreManager.java:130)
at
org.apache.openjpa.kernel.DelegatingStoreManager.load(DelegatingStoreManager.java:117)
at org.apache.openjpa.kernel.ROPStoreManager.load(ROPStoreManager.java:78)
at
org.apache.openjpa.kernel.StateManagerImpl.loadFields(StateManagerImpl.java:3072)
at
org.apache.openjpa.kernel.StateManagerImpl.loadField(StateManagerImpl.java:3149)
at
org.apache.openjpa.kernel.StateManagerImpl.beforeAccessField(StateManagerImpl.java:1613)
at
org.apache.openjpa.kernel.StateManagerImpl.accessingField(StateManagerImpl.java:1598)
at [x].entities.LrsEntityA.pcGetentitybs(LrsEntityA.java)
at [x].entities.LrsEntityA.getEntitybs(LrsEntityA.java:49)
> Improve performance of java.util.Calendar fields
> ------------------------------------------------
>
> Key: OPENJPA-2068
> URL: https://issues.apache.org/jira/browse/OPENJPA-2068
> Project: OpenJPA
> Issue Type: Improvement
> Components: jdbc
> Affects Versions: 2.2.0
> Reporter: Rick Curtis
> Assignee: Rick Curtis
> Fix For: 2.2.0
>
> Attachments: OPENJPA-2068.patch
>
>
> While doing some performance testing, I've found that we could improve the
> performance of loading Entities that have java.util.Calendar fields. When
> loading the data into a Calendar field, we actually create two Calendar
> instances per field. Normally creating an extra instance wouldn't be that big
> of a deal, but since creating a Calendar is very expensive I would like to
> remove creation of the extra instance.
> The call flow is something like this:
> - em.find(...) // find an Entity which has a calendar field
> ... execute query, processing result set...
> - DBDictionary.getCalendar(ResultSet,...) // Here we pull a Timestamp out of
> the result set, and create an unproxied Calendar instance.
> ...
> // now while trying to store the Calendar into the Entity instance, we find
> that this type needs to be proxied.
> SingleFieldManager.proxy(...) // Here we create the second Calendar instance,
> which is a proxied calendar
> I'd like to add a configuration property to DBDictionary that tells the
> runtime to always create proxied calendar instances. This would remove the
> creation of the initial un-proxied instance. For a large majority of
> application which use Calendars this would help.
> As always, there is a catch to this approach. If you were to execute a query
> such as : em.createQuery("SELECT c.myCal FROM CalendarEntity c where
> c.id=:id", MyCalendar.class), you would get back a proxied instance. This
> shouldn't be that big of a deal... but still a bit of a quirk.
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