could somebody explain to me, which collection types are supported under which conditions? I experience the problem, that after some changes at different parts of my project
private Set artists = new HashSet();
for me out of a sudden does not work anymore - I don't have a clue what makes it fail. But if I replace it with
private List artists = new Vector();
it does work without errors. The error message is:
[org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDefaultImpl] ERROR: while set field:
object class[ GroupImpl
target field: artists
target field type: interface java.util.Set
object value class: org.apache.ojb.broker.util.collections.RemovalAwareCollection
object value: [EMAIL PROTECTED]
java.lang.IllegalArgumentException
at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:63)
at java.lang.reflect.Field.set(Field.java:519)
at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDefaultImpl.set(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollection(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollections(Unknown Source)
at org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResultSet(Unknown Source)
at org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source)
at org.apache.ojb.broker.accesslayer.ChainingIterator.next(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown Source)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown Source)
at org.apache.ojb.odmg.oql.OQLQueryImpl.execute(Unknown Source)
rethrown as org.apache.ojb.broker.metadata.MetadataException: Error setting field:artists in GroupImpl
at org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDefaultImpl.set(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollection(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.retrieveCollections(Unknown Source)
at org.apache.ojb.broker.accesslayer.RsIterator.getObjectFromResultSet(Unknown Source)
at org.apache.ojb.broker.accesslayer.RsIterator.next(Unknown Source)
at org.apache.ojb.broker.accesslayer.ChainingIterator.next(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown Source)
at org.apache.ojb.broker.core.PersistenceBrokerImpl.getCollectionByQuery(Unknown Source)
at org.apache.ojb.broker.core.DelegatingPersistenceBroker.getCollectionByQuery(Unknown Source)
at org.apache.ojb.odmg.oql.OQLQueryImpl.execute(Unknown Source)
The documentation lists java.util.Collection in the "types allowed for implementing 1:n associations" section. Isn't a HashSet a Collection? Any help is appreciated.
-- Christian
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