eclipselink.jdbc.batch-writing

When I add the <property name="eclipselink.jdbc.batch-writing"
value="Oracle-JDBC" /> to my persistence.xml

I get the following error when the transaction tries to commit:

javax.persistence.RollbackException: Transaction rolled back because
transaction was set to RollbackOnly.

Can anyone tell me why this exception is thrown?

thanks,
Leon
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