+------+ +-----------------------+
| Item |------>| ItemComponent |
+------+ +-----------------------+
* Using the odmg layer
* two simultaneous transactions
* one deletes a single Item/ItemComponent pair
* the other does an oql query to retrieve all Item/ItemComponent pairs
* works with ObjectCacheDefaultImpl
* does not work with ObjectCachePerBrokerImpl
* get the exception below from the materialization code during a query
that is simultaneous with a delete
* no ItemComponent is found for one of the retrieved Items
* everything works if not simultaneous
* we are moving to ObjectCachePerBrokerImpl until the two-level global cache is
official
* we are at ojb rc6
* The reference-descriptor for ItemComponent inside Item's class-descriptor has
* auto-delete="true"
* in OJB.properties
*
PersistentFieldClass=org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldIntrospectorImpl
* i.e. using JavaBeans compliant calls only to access persistent
attributes
* in jdbc-connection-descriptor
* tried useAutoCommit="1" and "2" where
* 1 - set autoCommit explicit 'true' when connection created
and temporary set to 'false' when necessary (default mode).
* 2 - set autoCommit explicit 'false' when connection created.
* the exception occurs in both cases
* Item/ItemComponent pairs are deleted with this method in class Item
public void markDelete()
{
...
OJB.getInstance().getDatabase(this).deletePersistent(this);
...
}
* get this exception from the materialization code during a query that is
simultaneous with a delete
[DEFAULT] ERROR: Error in [PersistentFieldPropertyImpl],
java.lang.reflect.InvocationTargetException
[DEFAULT] ERROR: Declaring class [com.company.package.Item]
[DEFAULT] ERROR: Property Name [itemComponent]
[DEFAULT] ERROR: Property Type [com.company.package.IItemCopmponent]
[DEFAULT] ERROR: anObject was class [com.company.package.Item]
[DEFAULT] ERROR: aValue was null
org.apache.ojb.broker.metadata.MetadataException:
Error invoking method:setItemComponent in object:com.company.package.Item
at
org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldIntrospectorImpl.doSet(PersistentFieldIntr
ospectorImpl.java:97)
at
org.apache.ojb.broker.metadata.fieldaccess.AbstractPersistentField.set(AbstractPersistentField.java:
98)
at
org.apache.ojb.broker.accesslayer.ReferencePrefetcher.associateBatched(ReferencePrefetcher.java:86)
at
org.apache.ojb.broker.accesslayer.BasePrefetcher.prefetchRelationship(BasePrefetcher.java:111)
at
org.apache.ojb.broker.core.QueryReferenceBroker.performRetrievalTasks(QueryReferenceBroker.java:277)
at
org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(QueryReferenceBroker.java:146)
at
org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(QueryReferenceBroker.java:203)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(PersistenceBrokerImpl.java:120
1)
at
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(DelegatingPersistenceBro
ker.java:321)
at
org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(DelegatingPersistenceBro
ker.java:321)
at org.apache.ojb.odmg.oql.OQLQueryImpl.execute(OQLQueryImpl.java:246)
at com.company.package.AClass.getItemListFromOQLQuery(AClass.java:nnn)
...
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor237.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldIntrospectorImpl.doSet(PersistentFieldIntr
ospectorImpl.java:91)
... 26 more
Caused by: java.lang.NullPointerException
at com.company.package.Item.setItemComponent(Item.java:nnn)
... 30 more
* The bean method setItemComponent was passed null
* It appears that the query gets a Item that has no ItemComponent in the
database
* Can anybody help?
Thanks,
Mark
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