Sequencing problem with Batch Writing

I'm using TopLink - 9.0.3.5 and I want to use the registerAllObjects method from the UnitOfWork instead of registering each individually to batch write records to the db. Here is a snippet of what I'm doing:
Session session = ToplinkUtils.getSession();
session.getLogin().useBatchWriting();
session.getLogin().dontUseJDBCBatchWriting();
session.getLogin().setSequencePreallocationSize(200);
session.getLogin().setMaxBatchWritingSize(200);
session.getLogin().bindAllParameters();
session.getLogin().cacheAllStatements();
session.getLogin().useNativeSequencing();
UnitOfWork uow = ToplinkUtils.getActiveUnitOfWork(userId, ip);
for loop{
Notification dao = (Notification)
ToplinkUtils.createObject (Notification.class.getName());
dao.setName("someName");
dao.setAddress("someAddress");
allObjects.add(dao);
uow.registerAllObjects(allObjects);
This is the error I'm getting:
2007-03-06 15:28:40,482 DEBUG (11776:9:127.0.0.1) TOPLINK - JTS#beforeCompletion()
2007-03-06 15:28:40,482 DEBUG (11776:9:127.0.0.1) TOPLINK - SELECT GMS_NOTIFICATION_SEQ.NEXTVAL FROM DUAL
2007-03-06 15:28:40,497 DEBUG (11776:9:127.0.0.1) TOPLINK - INSERT INTO GMS_NOTIFICATION ...
2007-03-06 15:28:40,716 DEBUG (11776:9:127.0.0.1) TOPLINK - EXCEPTION [TOPLINK-4002] (TopLink - 9.0.3.5 (Build 436)): oracle.toplink.exceptions.DatabaseException
EXCEPTION DESCRIPTION: java.sql.SQLException: ORA-00001: unique constraint (GMSG2K.GMS_NOTIFICATION_PK) violated
It appears that the next sequence number is aquired for the primary key and a record is added but when Toplink tries to add the next record either the sequence is not aquired or the same sequence number is being used.
Do I need to set up a table in memory to acquire the sequences? Can anyone give me some guidence?
thanks

registerAllObjects() does not do anything special it just calls registerObject(), it does not affect batching.
In 9.0.3 batch writing was not supported with parameter binding, so this is why you are not seeing batching. This support was added in 9.0.4.
In 9.0.4 you should use,
Session session = ToplinkUtils.getSession();
session.getLogin().useBatchWriting();
session.getLogin().setSequencePreallocationSize(200);
session.getLogin().setMaxBatchWritingSize(200);
session.getLogin().bindAllParameters();
session.getLogin().cacheAllStatements();
session.getLogin().useNativeSequencing();
where setMaxBatchWritingSize(200) means 200 statements.
In 9.0.3 you can only use dynamic batch writing, which may not perform well. For dynamic batch writing, setMaxBatchWritingSize(200) means 200 characters (the size of the SQL buffer) so is too small, the default is 32,000.
If you are concerned about performance enabling sequence preallocation would also be beneficial.
If you still get timeouts, you may consider splitting your inserts into smaller batches (100 per each unit of work) instead of all in a single transaction.

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BatchSyncIssue.seq ‏32 KB

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