DBAdapter merge operation error

Hello,
I run into a problem when trying the DBAdapter merge operation. I believe the merge operation first executes a query operation based on the primary keys, if not found, then will execute an insert operation, my problem is when I pass in the input as " " for one primary key, seems the merge operation internally transform it to "" then do the query, so there is no record found, then it will do the insert with the right primary key " ", which results in the violation of the unique constraint (suppose I inserted a record with primary key " " before).
Does anyone have any suggestion for this?
Thanks.
Leo

I'm using database triggers as well, if your acquanted with pl/sql that would be the 1st choice, especially because you can generate the needed triggers for all your audit columns.
On the other hand you can define annotations in JPA, EJB3.0 now to populate your audit-columns automatically, maybe this can be done as well in the toplink mapping files?
It should be possible, but I don't now until which level annotations are supported in toplink used by the dbAdapters.
Kind regads,
Nathalie

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I have a simple SOA composite which reads XML files and posts data to a database table using a database adapter. I would like to perform a merge operation but I keep getting this error in the log -
SEVERE: JCABinding=> XML2DB:WriteInvToDB [ WriteInvToDB_ptt::merge(InventoryCollection) ] Could not invoke operation 'merge' against the 'Database Adapter' due to:
BINDING.JCA-11616
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SEVERE: JCABinding=> XML2DB:WriteInvToDB [ WriteInvToDB_ptt::merge(InventoryCollection) ] Could not invoke operation 'merge' against the 'Database Adapter' due to:
BINDING.JCA-11616
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Please see the logs for the full DBAdapter logging output prior to this exception.
Jan 3, 2009 10:58:06 AM oracle.integration.platform.blocks.adapter.fw.log.LogManagerImpl log
SEVERE: JCABinding=> [default/XML2DB!1.0*2008-12-23_13-27-06_078.WriteInvToDB]:merge One-way interaction failed
Jan 3, 2009 10:58:06 AM oracle.tip.mediator.serviceEngine.MediatorServiceEngine post2Mesh
SEVERE: Post 2 messah failed
oracle.fabric.common.FabricInvocationException: BINDING.JCA-12563
Exception occured when binding was invoked.
Exception occured during invocation of JCA binding: "JCA Binding execute of Reference operation 'merge' failed due to: DBWriteInteractionSpec Execute Failed Exception.
merge failed. Descriptor name: [WriteInvToDB.Inventory].
Caused by java.lang.NullPointerException.
The invoked JCA adapter raised a resource exception.
Please examine the above error message carefully to determine a resolution.
     at oracle.integration.platform.blocks.adapter.fw.jca.cci.EndpointInteractionException.getFabricInvocationException(EndpointInteractionException.java:74)
     at oracle.integration.platform.blocks.adapter.AdapterReference.post(AdapterReference.java:226)
     at oracle.integration.platform.blocks.mesh.AsynchronousMessageHandler.doPost(AsynchronousMessageHandler.java:153)
     at oracle.integration.platform.blocks.mesh.MessageRouter.post(MessageRouter.java:152)
     at oracle.integration.platform.blocks.mesh.MeshImpl.post(MeshImpl.java:159)
     at sun.reflect.GeneratedMethodAccessor253.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
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     at oracle.integration.platform.blocks.adapter.fw.jca.cci.JCAInteractionInvoker.invokeJcaReference(JCAInteractionInvoker.java:509)
     at oracle.integration.platform.blocks.adapter.fw.jca.cci.JCAInteractionInvoker.invokeAsyncJcaReference(JCAInteractionInvoker.java:493)
     at oracle.integration.platform.blocks.adapter.fw.jca.cci.JCAEndpointInteraction.performAsynchronousInteraction(JCAEndpointInteraction.java:429)
     at oracle.integration.platform.blocks.adapter.AdapterReference.post(AdapterReference.java:193)
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Caused by: BINDING.JCA-11616
DBWriteInteractionSpec Execute Failed Exception.
merge failed. Descriptor name: [WriteInvToDB.Inventory].
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Please see the logs for the full DBAdapter logging output prior to this exception.
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     at oracle.tip.adapter.db.exceptions.DBResourceException.outboundWriteException(DBResourceException.java:529)
     at oracle.tip.adapter.db.transaction.DBTransaction.commit(DBTransaction.java:287)
     at oracle.integration.platform.blocks.adapter.fw.jca.cci.JCAInteractionInvoker.executeJcaInteraction(JCAInteractionInvoker.java:311)
     ... 53 more
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     at oracle.toplink.internal.queryframework.ExpressionQueryMechanism.prepareUpdateObject(ExpressionQueryMechanism.java:1608)
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     at oracle.toplink.internal.queryframework.DatabaseQueryMechanism.updateObjectForWriteWithChangeSet(DatabaseQueryMechanism.java:1136)
     at oracle.toplink.queryframework.UpdateObjectQuery.executeCommitWithChangeSet(UpdateObjectQuery.java:69)
     at oracle.toplink.internal.queryframework.DatabaseQueryMechanism.executeWriteWithChangeSet(DatabaseQueryMechanism.java:279)
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Jan 3, 2009 10:58:06 AM oracle.integration.platform.blocks.adapter.fw.log.LogManagerImpl log
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Jan 3, 2009 10:58:06 AM oracle.integration.platform.blocks.adapter.fw.log.LogManagerImpl log
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     at java.lang.Thread.run(Thread.java:595)
Any help is greatly appreciated.
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Thanks.

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I'm using database triggers as well, if your acquanted with pl/sql that would be the 1st choice, especially because you can generate the needed triggers for all your audit columns.
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Kind regads,
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DBAdapter merge operation error

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