ValueHandlers try to immediately write even though one is only reading
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Key: OPENJPA-1929
URL: https://issues.apache.org/jira/browse/OPENJPA-1929
Project: OpenJPA
Issue Type: Bug
Components: jdbc
Affects Versions: 2.0.1
Environment: any
Reporter: David Schmitz
We have implemented an own ValueHandler by inheriting from
AbstractValueHandler.
If one reads from a query inside a transaction from a database, OpenJPA calls
the handler (toDataStoreValue) of the unmodified query objects trying to write
back to the database on commit, even though nothing has been manipulated.
The writting can only be avoided when leaving out the transaction block.
This is no correct JPA behaviour as it should be possible to do read-only data
processing within a JPA transaction.
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